Chapter 707: 707
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"Yes, it's the sofa bed where Zhang Lan often sleeps. I remember being here all the time. Why did it suddenly disappear?" He Lu actually wanted to talk about it for a long time.
If Gu Chen hadn't reminded himself to pay attention to the changes in the room, he might have forgotten.
Zhu Lei was stunned, and then he quickly said: "on that sofa bed, it looks very old. I I sold it. "
"Sold?" Asked Gu Chen.
Yes, yes Sold. Any questions? " Zhu Lei said.
Gu Chen frowned and could not say anything for the time being.
After all, selling furniture seems to be the freedom of residents, but when it comes to Zhang Lan's connection, Gu Chen still has some scruples.
After all, Zhang Lan's disappearance, anything related to Zhang Lan, seems to provide Gu Chen with a source of investigation.
Looking at the dark basement, Gu Chen hesitated for a moment, then turned to Yuan Shasha and said, "Xiao Yuan, go to the trunk of the car and bring my No. 2 toolbox."
"It's the toolbox with the fluorescent agent, isn't it?" This is because Gu Chen began to equip the tool box after he was promoted to the head of the third criminal investigation team.
Gu Chen got a lot of good things from Gao Chuanfeng, a forensic assistant, so yuan Shasha was not very clear about it, of course.
Gu Chen nodded slightly: "yes, in fact, what I need is a fluorescent agent."
"Well, I'll get it." Yuan Shasha nodded silently and left the scene immediately.
All of a sudden, everyone in the room was stunned. They didn't know what Gu Chen was going to do. The atmosphere was very strange.
He Lijuan hesitated again and again, but still summoned up the courage to ask Gu Chen: "officer Gu, the fluorescent agent you mentioned just now, this What is this? What is it for? "
"Fluorescent agents are used to test for blood stains." Gu Chen turned to look at her, especially Zhu Lei, and continued, "so if criminals want to cover up their crimes by wiping blood stains, they will end up with nothing. Don't underestimate the current investigation methods."
"Officer Gu, you What are you looking at me for? " A group of Zhu Lei's panic was also afraid to look straight at Gu Chen's eyes.
"I'm reminding someone." Gu Chen said.
In Gu Chen's opinion, Zhu Lei's situation is indeed abnormal.
If Zhang Lan and Zhu Lei have broken up, or are in conflict, how can she give her bank card to Zhu Lei, and take the cash in it at will?
Besides, as a student, Zhang Lan's cash in his bank card is his living expenses.
In the two days after Zhang Lan disappeared, Zhu Lei was crazily withdrawing money.
Without too much speculation, Gu Chen can guess where the money is spent.
Before long, Yuan Shasha came to Gu Chen with a small toolbox.
"Here you are, elder martial brother Gu."
"Give me the fluorescent." Gu Chen reached out and said.
After taking the fluorescent agent from Yuan Shasha's hand, Gu Chen comes to the basement again.
After seeing this, they all followed in succession.
At the entrance of the stairs, he Lu asked curiously, "officer Gu, is this thing so powerful? Can we really detect blood? "
"Is there still a fake?" Gu Chen, standing in the middle of the room, also reminds people: "you stay at the stairway, don't come down."
"Well, we won't come down." He Lu nodded slightly, but continued to ask: "but, how does this fluorescent agent detect blood stains? It seems that none of us has studied nursing in this respect. "
"You're not forensic." Lu Weiwei said with a light smile.
Gu Chen also said with a smile: "you don't underestimate this fluorescent agent. Even if the blood stains on the floor tiles are wiped clean, you can see the blue fluorescence by spraying fluorescent agent solution on the floor tiles that have been smeared with blood stains."
"If you spray a fluorescent solution on a floor tile without blood stains, there is no fluorescence reaction."
"What's the principle?" Lu Min, a nursing student, is also curious. After all, these things are hard to reach in nursing college.
Meeting Gu Chen today is a bit of an eye opener.
"It's very simple. Anyone who has studied chemistry should know it." Looking around, Gu Chen is also looking for the right range.
He looked back at Lu Min, and then said, "because luminol in the fluorescent solution reacts with heme in the blood, there will be a blue light."
"And this luminol solution, now widely used in criminal investigation means, and its verification effect is very sensitive."
"Even if a drop of blood drops into a large basin of water, you can see fluorescence when you spray it."
"What's more, even if the old blood is sprayed on it, fluorescence can be seen." Officer Wang, who was standing behind the crowd, also quickly added a sentence.
"Yes, that's the truth." Gu Chen said.
"Well Let's get started. " Zhang Lan's father was eager to find his daughter and hastened to get up.
At this moment, Gu Chen eyes across Zhu Lei, Zhu Lei obviously has an inadvertent evasion action.Gu Chen didn't think much about it. He picked up the fluorescent agent and began to spray it in every corner of the house.
After some operation, Gu Chen slowly walked to the light switch in the room and turned off the light.
At this moment, all people can't help but exclaim.
When Gu Chen turned off the light, there was a fluorescent light on the basement wall.
Everyone stood around the stairway and observed
These fluorescence not only exist on the basement wall, but also in the position where the sofa bed is placed, leaving a clear outline of the sofa bed when it is put down.
What's even more astonishing is that Gu Chen also saw other glowing patches that continued to the bathroom in the basement, and even some continued to the stairs.
At this moment, Gu chenmeng looked up at Zhu Lei and asked, "Zhu Lei, what's the situation?"
"This I don't know that, either? "
"Have you done anything to my daughter?" Because of Gu Chen's explanation of fluorescent agents just now, Zhang Lan's father quickly realized that all the blue light flashing was actually the reaction of blood stains.
Zhu Lei pushed away Zhang Lan's father, and the whole man said in fear: "you Don't talk nonsense. I'm How do I know what's going on in this room? "
"I don't know what happened. Why did you sell the sofa bed?"
In the dark room, Gu Chen turned on the bright flashlight and aimed at the outline of the sofa bed. He continued:
"these bloodstains were obviously generated before the sofa bed was removed, and then the sofa bed was moved away to form this obvious contour."
"It's been splashed here before." She said.
"That's right." Gu Chen nodded and went on to say: "not only here on the sofa bed, but also on the walls, stairs, and the distance between the bathroom and the living room, there are traces of blood."
Looking up at Zhu Lei, Gu Chen irradiates the bright flashlight in the past, and Zhu Lei immediately covers it with both hands.
"Zhu Lei, what happened in the basement? Where is Zhang Lan? "
"I I don't know. Besides, you said this fluorescent agent can detect blood stains. I How do I know if it's true? "
Zhu Lei for a time became the target of public criticism, directly retorted: "when I sold the sofa that day, there was no blood at all."
"You still want to deny it? Where is my daughter? " When he Lijuan hears the speech, she also wants to pinch Zhu Lei.
The two almost fought.
"Stop it all." Gu Chen roared and quickly suppressed their noise.
Instead, from tool box No. 2, I took a cotton swab, and at the place where the fluorescence was emitted, some liquid substances were taken.
Gu Chen takes the basement as a chemical testing room. Under the strong light flashlight, Gu Chen takes out a bottle of chemical reagent from the No.2 toolbox.
After that, Gu Chen sat down on the ground and directly tested these liquids with chemical reagents in front of the public.
It wasn't long before the source responded.
According to the contents of the forensic manual, Gu Chen can be very sure, which is enough to prove that the liquid is another obvious mark of blood.
"Zhang Lan must have happened here." After seeing this, Gu Chen stood up directly and said, "I have good evidence that all these reactions are caused by blood, and the evidence is consistent."
"If the couch was open and one of the people sitting on it was attacked, this pattern of blood splashing would have occurred."
"When the sofa bed blocked some parts of the wall and floor, after the sofa bed was removed, these parts were clean, and all the other places around it would emit fluorescence."
"That is to say, Zhang Lan may be killed in the basement?" Lu Weiwei couldn't believe it.
And Zhang Lan's father heard the speech, the whole is also a soft legs, almost fainted on the ground.
"Lao Zhang, Lao Zhang, what's wrong with you? Don't you have an accident? " He Lijuan grabbed Zhang Lan's father and woke him up with a sad face.
"Xiao Yuan, help to take Mr. Zhang out of the room." Gu Chen said.
"No problem." Yuan Shasha nodded and helped he Lijuan to put Zhang Lan's father out of the room.
At this moment, Lu Min is also panic stricken. He quickly asks Gu Chen: "officer Gu, is Zhang Lan really in trouble?"
"That's about to ask him." Gu Chen glances at Zhu Lei.
Zhu Lei stepped back and waved his hand to clarify: "police comrade, I I really don't know. Don't frame me? "
"Frame you? You and Zhang Lan are the only ones who live in this house, right? Is there anyone else? " Asked Lu Weiwei.
Zhu Lei was speechless and unable to refute.
Police officer Wang also asked, "I said Zhu Lei, I think you'd better recruit. Where is Zhang Lan now? Why do you take Zhang Lan's bank card and spend money when Zhang Lan is missing? You must account for these things today. ""Yes, did you kill Zhang Lan?" He LuHong's eyes are on the verge of crying.
However, Zhu Lei was silent and began to refuse to answer any questions.
Whether it's Lu Weiwei, officer Wang, or Zhang Lan's classmate and roommate Lu Min and he Lu.
All people's questions, Zhu Lei began to keep silent.
Seeing this, Gu Chen said bluntly: "Zhu Lei, even if you don't say it, do you think I can't find it? Don't think too smart about yourself. "
"But officer, I didn't kill. Why should I admit it?" Zhu Lei's attitude of breaking the jar with Gu's in the end.
Gu Chen nodded slightly and continued: "I sprayed a lot of fluorescent agent in my room, which can tell me what happened on the basement floor at that time."
Turning around and looking at the bathroom, Gu Chen continues to search.
From the living room fluorescence, has continued to the bathroom, Gu Chen found that in the bathtub sewer and toilet stool, there are many strong fluorescence reactions.
When Gu Chen inspected the wooden stool further, he found that it was an old wooden stool.
In Gu Chen's impression, this kind of stool should exist in his childhood, most of which are in the community canteen.
Gu Chen wears white gloves and turns off the bright flashlight.
At this moment, in the dim bathroom, Gu Chen found that there were many luminous places around the stool.
Gu Chen reverses the stool, and it can be clearly seen that the fluorescence on the back of the stool is the most, which indicates that there are also the most blood stains left on it, including some tissue objects.
And all these things are usually invisible to ordinary people.
"The bathroom looks clean, which shows that this guy has done a thorough cleaning job." Gu Chen frowned.
However, after turning the stool over, Gu Chen hesitated for a moment, feeling that he should take the stool back for detection.
So Gu Chen first put the stool to one side and began to check the water pipes of the bathtub.
Gu Chen gently unscrewed the cover of the water pipe. In the light of a strong flashlight, he found that there were more tissue fragments inside.
Different from the small tissue fragments found on the wooden stool just now, quite large tissue fragments are adhered to the cover of the water pipe.
Of course, for Gu Chen, as long as the fragments larger than a small plaque are quite large fragments.
But Gu Chen found this piece of debris, as big as a little finger tip. Seeing this scene, Gu Chen couldn't help but shiver in his heart.
"So Is it a piece of human tissue that sticks to the wall of the sewer
Taking a breath of cool air, Gu Chen looks back at the living room. He is puzzled.
At this time, police officer Wang has taken Zhu Lei under control. Lu Weiwei comes to Gu Chen's side and asks softly, "brother Gu, do you have any new discoveries in the bathroom?"
"There's a lot of fluorescence in the bathroom, indicating that someone has washed blood here, and there may be some tiny human tissue left on the wooden stool."
"People Human tissue? Is it true? " Gu Chen is also frightened by the words, Lu Weiwei the whole person eyes a daze.
Gu Chen nodded silently and said, "and I suspect that the murderer moved the stool in the process of the murder."
"He didn't expect to transfer some evidence to the inside of the stool when he grabbed it."
"What's more, the tissue fragments in the sewer can't be washed away along the sewer due to different volumes, and they are firmly attached to the wall of the sewer."
"If we combine everything we've found here and give the technology lab enough samples to do DNA testing."
"I think the test results should be what I imagined. This is probably Zhang Lan's DNA."
"Yes." Lu Weiwei was also very sure: "we can extract DNA from these tissues and compare it with Zhang Lan's father. If these samples are consistent with Zhang Lan's father's DNA samples, then we have enough evidence."
"Take that wooden stool back." Guchen gets up and goes straight out of the bathroom.
Lu Weiwei is careful to take the wooden stool that good, from the equipment bag, take out a large transparent forensics bag, the wooden stool wrapped in it.
Seeing Gu Chen and Lu Weiwei come out from the bathroom and have been looking at Zhu Lei's police officer Wang, this quickly chased and asked: "how?"
"There was a lot of blood in the bathroom, and we found suspected human tissue on the inside of the wooden stool in the toilet and on the wall of the sewer pipe."
"People Human tissue? "
On hearing this term, Lu Min and he Lu can't help but look at each other.
They soon understood what Gu Chen meant. They were so frightened that they held each other together.
"Why How could this happen? How could there be so much blood? How can there be human tissue? ""Is it that Zhang Lan is Is she really dead? "
"My God! How could this happen? "
Gu Chen walked up to Zhu Lei, grabbed Zhu Lei's collar and asked coldly, "who did you sell that sofa chair to?"
"Just Just one piece of junk. " Hearing what Gu Chen said just now, Zhu Lei is also flustered.
In the face of Gu Chen's sharp eyes, his legs even soften and his eyes keep avoiding.
"Lu Min and he Lu, you two go to the garden on the first floor to see if there are any suspicious signs of burial in the garden on the first floor." Gu Chen said.
"Good Good. " At the moment, the two men were also in panic. They had not dared to stay on the underground floor of this shady and dry place.
When Gu Chen's voice dropped, he also hurried to the garden on the first floor to look for yuan Shasha.
At this moment, Gu turned on all the lights on the first floor and continued to collect strong evidence in every corner of the room.
It seems that Lu Weichen has a new sword under her. It seems that she has a knife under her
"Let me see." Gu Chen squats down and quickly takes over the sharp weapon from Lu Weiwei.
This is a machete with beautiful appearance. Gu Chen finds it very clean, but judging from the color of the blade, it seems to have been baked.
Gu Chen did not say a word, spray the remaining fluorescent agent on the blade, looking forward to all show.
However, to Gu Chen's surprise, the fluorescent agent did not seem to play a significant role in the blade.
Gu Chen could not help frowning: "is it that the things on it have been decomposed?"
"From the blade point of view, this is obviously used, you see, the blade is from the gap." Said Lu Weiwei, pointing to a gap.
Gu Chen nodded slightly and said, "yes, there are signs that there is a small amount of blood on the chopper."
"But maybe it's because there's too little blood, and the fluorescent doesn't seem to react much."
"Try again with the reagent." Wang said.
Gu Chen nodded and agreed, thinking that if we could detect a little bit on the blade, many problems could be solved if we could extract blood DNA.
……
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"Yes, it's the sofa bed where Zhang Lan often sleeps. I remember being here all the time. Why did it suddenly disappear?" He Lu actually wanted to talk about it for a long time.
If Gu Chen hadn't reminded himself to pay attention to the changes in the room, he might have forgotten.
Zhu Lei was stunned, and then he quickly said: "on that sofa bed, it looks very old. I I sold it. "
"Sold?" Asked Gu Chen.
Yes, yes Sold. Any questions? " Zhu Lei said.
Gu Chen frowned and could not say anything for the time being.
After all, selling furniture seems to be the freedom of residents, but when it comes to Zhang Lan's connection, Gu Chen still has some scruples.
After all, Zhang Lan's disappearance, anything related to Zhang Lan, seems to provide Gu Chen with a source of investigation.
Looking at the dark basement, Gu Chen hesitated for a moment, then turned to Yuan Shasha and said, "Xiao Yuan, go to the trunk of the car and bring my No. 2 toolbox."
"It's the toolbox with the fluorescent agent, isn't it?" This is because Gu Chen began to equip the tool box after he was promoted to the head of the third criminal investigation team.
Gu Chen got a lot of good things from Gao Chuanfeng, a forensic assistant, so yuan Shasha was not very clear about it, of course.
Gu Chen nodded slightly: "yes, in fact, what I need is a fluorescent agent."
"Well, I'll get it." Yuan Shasha nodded silently and left the scene immediately.
All of a sudden, everyone in the room was stunned. They didn't know what Gu Chen was going to do. The atmosphere was very strange.
He Lijuan hesitated again and again, but still summoned up the courage to ask Gu Chen: "officer Gu, the fluorescent agent you mentioned just now, this What is this? What is it for? "
"Fluorescent agents are used to test for blood stains." Gu Chen turned to look at her, especially Zhu Lei, and continued, "so if criminals want to cover up their crimes by wiping blood stains, they will end up with nothing. Don't underestimate the current investigation methods."
"Officer Gu, you What are you looking at me for? " A group of Zhu Lei's panic was also afraid to look straight at Gu Chen's eyes.
"I'm reminding someone." Gu Chen said.
In Gu Chen's opinion, Zhu Lei's situation is indeed abnormal.
If Zhang Lan and Zhu Lei have broken up, or are in conflict, how can she give her bank card to Zhu Lei, and take the cash in it at will?
Besides, as a student, Zhang Lan's cash in his bank card is his living expenses.
In the two days after Zhang Lan disappeared, Zhu Lei was crazily withdrawing money.
Without too much speculation, Gu Chen can guess where the money is spent.
Before long, Yuan Shasha came to Gu Chen with a small toolbox.
"Here you are, elder martial brother Gu."
"Give me the fluorescent." Gu Chen reached out and said.
After taking the fluorescent agent from Yuan Shasha's hand, Gu Chen comes to the basement again.
After seeing this, they all followed in succession.
At the entrance of the stairs, he Lu asked curiously, "officer Gu, is this thing so powerful? Can we really detect blood? "
"Is there still a fake?" Gu Chen, standing in the middle of the room, also reminds people: "you stay at the stairway, don't come down."
"Well, we won't come down." He Lu nodded slightly, but continued to ask: "but, how does this fluorescent agent detect blood stains? It seems that none of us has studied nursing in this respect. "
"You're not forensic." Lu Weiwei said with a light smile.
Gu Chen also said with a smile: "you don't underestimate this fluorescent agent. Even if the blood stains on the floor tiles are wiped clean, you can see the blue fluorescence by spraying fluorescent agent solution on the floor tiles that have been smeared with blood stains."
"If you spray a fluorescent solution on a floor tile without blood stains, there is no fluorescence reaction."
"What's the principle?" Lu Min, a nursing student, is also curious. After all, these things are hard to reach in nursing college.
Meeting Gu Chen today is a bit of an eye opener.
"It's very simple. Anyone who has studied chemistry should know it." Looking around, Gu Chen is also looking for the right range.
He looked back at Lu Min, and then said, "because luminol in the fluorescent solution reacts with heme in the blood, there will be a blue light."
"And this luminol solution, now widely used in criminal investigation means, and its verification effect is very sensitive."
"Even if a drop of blood drops into a large basin of water, you can see fluorescence when you spray it."
"What's more, even if the old blood is sprayed on it, fluorescence can be seen." Officer Wang, who was standing behind the crowd, also quickly added a sentence.
"Yes, that's the truth." Gu Chen said.
"Well Let's get started. " Zhang Lan's father was eager to find his daughter and hastened to get up.
At this moment, Gu Chen eyes across Zhu Lei, Zhu Lei obviously has an inadvertent evasion action.Gu Chen didn't think much about it. He picked up the fluorescent agent and began to spray it in every corner of the house.
After some operation, Gu Chen slowly walked to the light switch in the room and turned off the light.
At this moment, all people can't help but exclaim.
When Gu Chen turned off the light, there was a fluorescent light on the basement wall.
Everyone stood around the stairway and observed
These fluorescence not only exist on the basement wall, but also in the position where the sofa bed is placed, leaving a clear outline of the sofa bed when it is put down.
What's even more astonishing is that Gu Chen also saw other glowing patches that continued to the bathroom in the basement, and even some continued to the stairs.
At this moment, Gu chenmeng looked up at Zhu Lei and asked, "Zhu Lei, what's the situation?"
"This I don't know that, either? "
"Have you done anything to my daughter?" Because of Gu Chen's explanation of fluorescent agents just now, Zhang Lan's father quickly realized that all the blue light flashing was actually the reaction of blood stains.
Zhu Lei pushed away Zhang Lan's father, and the whole man said in fear: "you Don't talk nonsense. I'm How do I know what's going on in this room? "
"I don't know what happened. Why did you sell the sofa bed?"
In the dark room, Gu Chen turned on the bright flashlight and aimed at the outline of the sofa bed. He continued:
"these bloodstains were obviously generated before the sofa bed was removed, and then the sofa bed was moved away to form this obvious contour."
"It's been splashed here before." She said.
"That's right." Gu Chen nodded and went on to say: "not only here on the sofa bed, but also on the walls, stairs, and the distance between the bathroom and the living room, there are traces of blood."
Looking up at Zhu Lei, Gu Chen irradiates the bright flashlight in the past, and Zhu Lei immediately covers it with both hands.
"Zhu Lei, what happened in the basement? Where is Zhang Lan? "
"I I don't know. Besides, you said this fluorescent agent can detect blood stains. I How do I know if it's true? "
Zhu Lei for a time became the target of public criticism, directly retorted: "when I sold the sofa that day, there was no blood at all."
"You still want to deny it? Where is my daughter? " When he Lijuan hears the speech, she also wants to pinch Zhu Lei.
The two almost fought.
"Stop it all." Gu Chen roared and quickly suppressed their noise.
Instead, from tool box No. 2, I took a cotton swab, and at the place where the fluorescence was emitted, some liquid substances were taken.
Gu Chen takes the basement as a chemical testing room. Under the strong light flashlight, Gu Chen takes out a bottle of chemical reagent from the No.2 toolbox.
After that, Gu Chen sat down on the ground and directly tested these liquids with chemical reagents in front of the public.
It wasn't long before the source responded.
According to the contents of the forensic manual, Gu Chen can be very sure, which is enough to prove that the liquid is another obvious mark of blood.
"Zhang Lan must have happened here." After seeing this, Gu Chen stood up directly and said, "I have good evidence that all these reactions are caused by blood, and the evidence is consistent."
"If the couch was open and one of the people sitting on it was attacked, this pattern of blood splashing would have occurred."
"When the sofa bed blocked some parts of the wall and floor, after the sofa bed was removed, these parts were clean, and all the other places around it would emit fluorescence."
"That is to say, Zhang Lan may be killed in the basement?" Lu Weiwei couldn't believe it.
And Zhang Lan's father heard the speech, the whole is also a soft legs, almost fainted on the ground.
"Lao Zhang, Lao Zhang, what's wrong with you? Don't you have an accident? " He Lijuan grabbed Zhang Lan's father and woke him up with a sad face.
"Xiao Yuan, help to take Mr. Zhang out of the room." Gu Chen said.
"No problem." Yuan Shasha nodded and helped he Lijuan to put Zhang Lan's father out of the room.
At this moment, Lu Min is also panic stricken. He quickly asks Gu Chen: "officer Gu, is Zhang Lan really in trouble?"
"That's about to ask him." Gu Chen glances at Zhu Lei.
Zhu Lei stepped back and waved his hand to clarify: "police comrade, I I really don't know. Don't frame me? "
"Frame you? You and Zhang Lan are the only ones who live in this house, right? Is there anyone else? " Asked Lu Weiwei.
Zhu Lei was speechless and unable to refute.
Police officer Wang also asked, "I said Zhu Lei, I think you'd better recruit. Where is Zhang Lan now? Why do you take Zhang Lan's bank card and spend money when Zhang Lan is missing? You must account for these things today. ""Yes, did you kill Zhang Lan?" He LuHong's eyes are on the verge of crying.
However, Zhu Lei was silent and began to refuse to answer any questions.
Whether it's Lu Weiwei, officer Wang, or Zhang Lan's classmate and roommate Lu Min and he Lu.
All people's questions, Zhu Lei began to keep silent.
Seeing this, Gu Chen said bluntly: "Zhu Lei, even if you don't say it, do you think I can't find it? Don't think too smart about yourself. "
"But officer, I didn't kill. Why should I admit it?" Zhu Lei's attitude of breaking the jar with Gu's in the end.
Gu Chen nodded slightly and continued: "I sprayed a lot of fluorescent agent in my room, which can tell me what happened on the basement floor at that time."
Turning around and looking at the bathroom, Gu Chen continues to search.
From the living room fluorescence, has continued to the bathroom, Gu Chen found that in the bathtub sewer and toilet stool, there are many strong fluorescence reactions.
When Gu Chen inspected the wooden stool further, he found that it was an old wooden stool.
In Gu Chen's impression, this kind of stool should exist in his childhood, most of which are in the community canteen.
Gu Chen wears white gloves and turns off the bright flashlight.
At this moment, in the dim bathroom, Gu Chen found that there were many luminous places around the stool.
Gu Chen reverses the stool, and it can be clearly seen that the fluorescence on the back of the stool is the most, which indicates that there are also the most blood stains left on it, including some tissue objects.
And all these things are usually invisible to ordinary people.
"The bathroom looks clean, which shows that this guy has done a thorough cleaning job." Gu Chen frowned.
However, after turning the stool over, Gu Chen hesitated for a moment, feeling that he should take the stool back for detection.
So Gu Chen first put the stool to one side and began to check the water pipes of the bathtub.
Gu Chen gently unscrewed the cover of the water pipe. In the light of a strong flashlight, he found that there were more tissue fragments inside.
Different from the small tissue fragments found on the wooden stool just now, quite large tissue fragments are adhered to the cover of the water pipe.
Of course, for Gu Chen, as long as the fragments larger than a small plaque are quite large fragments.
But Gu Chen found this piece of debris, as big as a little finger tip. Seeing this scene, Gu Chen couldn't help but shiver in his heart.
"So Is it a piece of human tissue that sticks to the wall of the sewer
Taking a breath of cool air, Gu Chen looks back at the living room. He is puzzled.
At this time, police officer Wang has taken Zhu Lei under control. Lu Weiwei comes to Gu Chen's side and asks softly, "brother Gu, do you have any new discoveries in the bathroom?"
"There's a lot of fluorescence in the bathroom, indicating that someone has washed blood here, and there may be some tiny human tissue left on the wooden stool."
"People Human tissue? Is it true? " Gu Chen is also frightened by the words, Lu Weiwei the whole person eyes a daze.
Gu Chen nodded silently and said, "and I suspect that the murderer moved the stool in the process of the murder."
"He didn't expect to transfer some evidence to the inside of the stool when he grabbed it."
"What's more, the tissue fragments in the sewer can't be washed away along the sewer due to different volumes, and they are firmly attached to the wall of the sewer."
"If we combine everything we've found here and give the technology lab enough samples to do DNA testing."
"I think the test results should be what I imagined. This is probably Zhang Lan's DNA."
"Yes." Lu Weiwei was also very sure: "we can extract DNA from these tissues and compare it with Zhang Lan's father. If these samples are consistent with Zhang Lan's father's DNA samples, then we have enough evidence."
"Take that wooden stool back." Guchen gets up and goes straight out of the bathroom.
Lu Weiwei is careful to take the wooden stool that good, from the equipment bag, take out a large transparent forensics bag, the wooden stool wrapped in it.
Seeing Gu Chen and Lu Weiwei come out from the bathroom and have been looking at Zhu Lei's police officer Wang, this quickly chased and asked: "how?"
"There was a lot of blood in the bathroom, and we found suspected human tissue on the inside of the wooden stool in the toilet and on the wall of the sewer pipe."
"People Human tissue? "
On hearing this term, Lu Min and he Lu can't help but look at each other.
They soon understood what Gu Chen meant. They were so frightened that they held each other together.
"Why How could this happen? How could there be so much blood? How can there be human tissue? ""Is it that Zhang Lan is Is she really dead? "
"My God! How could this happen? "
Gu Chen walked up to Zhu Lei, grabbed Zhu Lei's collar and asked coldly, "who did you sell that sofa chair to?"
"Just Just one piece of junk. " Hearing what Gu Chen said just now, Zhu Lei is also flustered.
In the face of Gu Chen's sharp eyes, his legs even soften and his eyes keep avoiding.
"Lu Min and he Lu, you two go to the garden on the first floor to see if there are any suspicious signs of burial in the garden on the first floor." Gu Chen said.
"Good Good. " At the moment, the two men were also in panic. They had not dared to stay on the underground floor of this shady and dry place.
When Gu Chen's voice dropped, he also hurried to the garden on the first floor to look for yuan Shasha.
At this moment, Gu turned on all the lights on the first floor and continued to collect strong evidence in every corner of the room.
It seems that Lu Weichen has a new sword under her. It seems that she has a knife under her
"Let me see." Gu Chen squats down and quickly takes over the sharp weapon from Lu Weiwei.
This is a machete with beautiful appearance. Gu Chen finds it very clean, but judging from the color of the blade, it seems to have been baked.
Gu Chen did not say a word, spray the remaining fluorescent agent on the blade, looking forward to all show.
However, to Gu Chen's surprise, the fluorescent agent did not seem to play a significant role in the blade.
Gu Chen could not help frowning: "is it that the things on it have been decomposed?"
"From the blade point of view, this is obviously used, you see, the blade is from the gap." Said Lu Weiwei, pointing to a gap.
Gu Chen nodded slightly and said, "yes, there are signs that there is a small amount of blood on the chopper."
"But maybe it's because there's too little blood, and the fluorescent doesn't seem to react much."
"Try again with the reagent." Wang said.
Gu Chen nodded and agreed, thinking that if we could detect a little bit on the blade, many problems could be solved if we could extract blood DNA.
……
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"Yes, it's the sofa bed where Zhang Lan often sleeps. I remember being here all the time. Why did it suddenly disappear?" He Lu actually wanted to talk about it for a long time. If Gu Chen hadn't reminded himself to pay attention to the changes in the room, he might have forgotten. Zhu Lei was stunned, and then he quickly said: "on that sofa bed, it looks very old. I I sold it. " "Sold?" Asked Gu Chen. Yes, yes Sold. Any questions? " Zhu Lei said. Gu Chen frowned and could not say anything for the time being. After all, selling furniture seems to be the freedom of residents, but when it comes to Zhang Lan's connection, Gu Chen still has some scruples. After all, Zhang Lan's disappearance, anything related to Zhang Lan, seems to provide Gu Chen with a source of investigation. Looking at the dark basement, Gu Chen hesitated for a moment, then turned to Yuan Shasha and said, "Xiao Yuan, go to the trunk of the car and bring my No. 2 toolbox." "It's the toolbox with the fluorescent agent, isn't it?" This is because Gu Chen began to equip the tool box after he was promoted to the head of the third criminal investigation team. Gu Chen got a lot of good things from Gao Chuanfeng, a forensic assistant, so yuan Shasha was not very clear about it, of course. Gu Chen nodded slightly: "yes, in fact, what I need is a fluorescent agent." "Well, I'll get it." Yuan Shasha nodded silently and left the scene immediately. All of a sudden, everyone in the room was stunned. They didn't know what Gu Chen was going to do. The atmosphere was very strange. He Lijuan hesitated again and again, but still summoned up the courage to ask Gu Chen: "officer Gu, the fluorescent agent you mentioned just now, this What is this? What is it for? " "Fluorescent agents are used to test for blood stains." Gu Chen turned to look at her, especially Zhu Lei, and continued, "so if criminals want to cover up their crimes by wiping blood stains, they will end up with nothing. Don't underestimate the current investigation methods." "Officer Gu, you What are you looking at me for? " A group of Zhu Lei's panic was also afraid to look straight at Gu Chen's eyes. "I'm reminding someone." Gu Chen said. In Gu Chen's opinion, Zhu Lei's situation is indeed abnormal. If Zhang Lan and Zhu Lei have broken up, or are in conflict, how can she give her bank card to Zhu Lei, and take the cash in it at will? Besides, as a student, Zhang Lan's cash in his bank card is his living expenses. In the two days after Zhang Lan disappeared, Zhu Lei was crazily withdrawing money. Without too much speculation, Gu Chen can guess where the money is spent. Before long, Yuan Shasha came to Gu Chen with a small toolbox. "Here you are, elder martial brother Gu." "Give me the fluorescent." Gu Chen reached out and said. After taking the fluorescent agent from Yuan Shasha's hand, Gu Chen comes to the basement again. After seeing this, they all followed in succession. At the entrance of the stairs, he Lu asked curiously, "officer Gu, is this thing so powerful? Can we really detect blood? " "Is there still a fake?" Gu Chen, standing in the middle of the room, also reminds people: "you stay at the stairway, don't come down." "Well, we won't come down." He Lu nodded slightly, but continued to ask: "but, how does this fluorescent agent detect blood stains? It seems that none of us has studied nursing in this respect. " "You're not forensic." Lu Weiwei said with a light smile. Gu Chen also said with a smile: "you don't underestimate this fluorescent agent. Even if the blood stains on the floor tiles are wiped clean, you can see the blue fluorescence by spraying fluorescent agent solution on the floor tiles that have been smeared with blood stains." "If you spray a fluorescent solution on a floor tile without blood stains, there is no fluorescence reaction." "What's the principle?" Lu Min, a nursing student, is also curious. After all, these things are hard to reach in nursing college. Meeting Gu Chen today is a bit of an eye opener. "It's very simple. Anyone who has studied chemistry should know it." Looking around, Gu Chen is also looking for the right range. He looked back at Lu Min, and then said, "because luminol in the fluorescent solution reacts with heme in the blood, there will be a blue light." "And this luminol solution, now widely used in criminal investigation means, and its verification effect is very sensitive." "Even if a drop of blood drops into a large basin of water, you can see fluorescence when you spray it." "What's more, even if the old blood is sprayed on it, fluorescence can be seen." Officer Wang, who was standing behind the crowd, also quickly added a sentence. "Yes, that's the truth." Gu Chen said. "Well Let's get started. " Zhang Lan's father was eager to find his daughter and hastened to get up. At this moment, Gu Chen eyes across Zhu Lei, Zhu Lei obviously has an inadvertent evasion action.Gu Chen didn't think much about it. He picked up the fluorescent agent and began to spray it in every corner of the house. After some operation, Gu Chen slowly walked to the light switch in the room and turned off the light. At this moment, all people can't help but exclaim. When Gu Chen turned off the light, there was a fluorescent light on the basement wall. Everyone stood around the stairway and observed These fluorescence not only exist on the basement wall, but also in the position where the sofa bed is placed, leaving a clear outline of the sofa bed when it is put down. What's even more astonishing is that Gu Chen also saw other glowing patches that continued to the bathroom in the basement, and even some continued to the stairs. At this moment, Gu chenmeng looked up at Zhu Lei and asked, "Zhu Lei, what's the situation?" "This I don't know that, either? " "Have you done anything to my daughter?" Because of Gu Chen's explanation of fluorescent agents just now, Zhang Lan's father quickly realized that all the blue light flashing was actually the reaction of blood stains. Zhu Lei pushed away Zhang Lan's father, and the whole man said in fear: "you Don't talk nonsense. I'm How do I know what's going on in this room? " "I don't know what happened. Why did you sell the sofa bed?" In the dark room, Gu Chen turned on the bright flashlight and aimed at the outline of the sofa bed. He continued: "these bloodstains were obviously generated before the sofa bed was removed, and then the sofa bed was moved away to form this obvious contour." "It's been splashed here before." She said. "That's right." Gu Chen nodded and went on to say: "not only here on the sofa bed, but also on the walls, stairs, and the distance between the bathroom and the living room, there are traces of blood." Looking up at Zhu Lei, Gu Chen irradiates the bright flashlight in the past, and Zhu Lei immediately covers it with both hands. "Zhu Lei, what happened in the basement? Where is Zhang Lan? " "I I don't know. Besides, you said this fluorescent agent can detect blood stains. I How do I know if it's true? " Zhu Lei for a time became the target of public criticism, directly retorted: "when I sold the sofa that day, there was no blood at all." "You still want to deny it? Where is my daughter? " When he Lijuan hears the speech, she also wants to pinch Zhu Lei. The two almost fought. "Stop it all." Gu Chen roared and quickly suppressed their noise. Instead, from tool box No. 2, I took a cotton swab, and at the place where the fluorescence was emitted, some liquid substances were taken. Gu Chen takes the basement as a chemical testing room. Under the strong light flashlight, Gu Chen takes out a bottle of chemical reagent from the No.2 toolbox. After that, Gu Chen sat down on the ground and directly tested these liquids with chemical reagents in front of the public. It wasn't long before the source responded. According to the contents of the forensic manual, Gu Chen can be very sure, which is enough to prove that the liquid is another obvious mark of blood. "Zhang Lan must have happened here." After seeing this, Gu Chen stood up directly and said, "I have good evidence that all these reactions are caused by blood, and the evidence is consistent." "If the couch was open and one of the people sitting on it was attacked, this pattern of blood splashing would have occurred." "When the sofa bed blocked some parts of the wall and floor, after the sofa bed was removed, these parts were clean, and all the other places around it would emit fluorescence." "That is to say, Zhang Lan may be killed in the basement?" Lu Weiwei couldn't believe it. And Zhang Lan's father heard the speech, the whole is also a soft legs, almost fainted on the ground. "Lao Zhang, Lao Zhang, what's wrong with you? Don't you have an accident? " He Lijuan grabbed Zhang Lan's father and woke him up with a sad face. "Xiao Yuan, help to take Mr. Zhang out of the room." Gu Chen said. "No problem." Yuan Shasha nodded and helped he Lijuan to put Zhang Lan's father out of the room. At this moment, Lu Min is also panic stricken. He quickly asks Gu Chen: "officer Gu, is Zhang Lan really in trouble?" "That's about to ask him." Gu Chen glances at Zhu Lei. Zhu Lei stepped back and waved his hand to clarify: "police comrade, I I really don't know. Don't frame me? " "Frame you? You and Zhang Lan are the only ones who live in this house, right? Is there anyone else? " Asked Lu Weiwei. Zhu Lei was speechless and unable to refute. Police officer Wang also asked, "I said Zhu Lei, I think you'd better recruit. Where is Zhang Lan now? Why do you take Zhang Lan's bank card and spend money when Zhang Lan is missing? You must account for these things today. ""Yes, did you kill Zhang Lan?" He LuHong's eyes are on the verge of crying. However, Zhu Lei was silent and began to refuse to answer any questions. Whether it's Lu Weiwei, officer Wang, or Zhang Lan's classmate and roommate Lu Min and he Lu. All people's questions, Zhu Lei began to keep silent. Seeing this, Gu Chen said bluntly: "Zhu Lei, even if you don't say it, do you think I can't find it? Don't think too smart about yourself. " "But officer, I didn't kill. Why should I admit it?" Zhu Lei's attitude of breaking the jar with Gu's in the end. Gu Chen nodded slightly and continued: "I sprayed a lot of fluorescent agent in my room, which can tell me what happened on the basement floor at that time." Turning around and looking at the bathroom, Gu Chen continues to search. From the living room fluorescence, has continued to the bathroom, Gu Chen found that in the bathtub sewer and toilet stool, there are many strong fluorescence reactions. When Gu Chen inspected the wooden stool further, he found that it was an old wooden stool. In Gu Chen's impression, this kind of stool should exist in his childhood, most of which are in the community canteen. Gu Chen wears white gloves and turns off the bright flashlight. At this moment, in the dim bathroom, Gu Chen found that there were many luminous places around the stool. Gu Chen reverses the stool, and it can be clearly seen that the fluorescence on the back of the stool is the most, which indicates that there are also the most blood stains left on it, including some tissue objects. And all these things are usually invisible to ordinary people. "The bathroom looks clean, which shows that this guy has done a thorough cleaning job." Gu Chen frowned. However, after turning the stool over, Gu Chen hesitated for a moment, feeling that he should take the stool back for detection. So Gu Chen first put the stool to one side and began to check the water pipes of the bathtub. Gu Chen gently unscrewed the cover of the water pipe. In the light of a strong flashlight, he found that there were more tissue fragments inside. Different from the small tissue fragments found on the wooden stool just now, quite large tissue fragments are adhered to the cover of the water pipe. Of course, for Gu Chen, as long as the fragments larger than a small plaque are quite large fragments. But Gu Chen found this piece of debris, as big as a little finger tip. Seeing this scene, Gu Chen couldn't help but shiver in his heart. "So Is it a piece of human tissue that sticks to the wall of the sewer Taking a breath of cool air, Gu Chen looks back at the living room. He is puzzled. At this time, police officer Wang has taken Zhu Lei under control. Lu Weiwei comes to Gu Chen's side and asks softly, "brother Gu, do you have any new discoveries in the bathroom?" "There's a lot of fluorescence in the bathroom, indicating that someone has washed blood here, and there may be some tiny human tissue left on the wooden stool." "People Human tissue? Is it true? " Gu Chen is also frightened by the words, Lu Weiwei the whole person eyes a daze. Gu Chen nodded silently and said, "and I suspect that the murderer moved the stool in the process of the murder." "He didn't expect to transfer some evidence to the inside of the stool when he grabbed it." "What's more, the tissue fragments in the sewer can't be washed away along the sewer due to different volumes, and they are firmly attached to the wall of the sewer." "If we combine everything we've found here and give the technology lab enough samples to do DNA testing." "I think the test results should be what I imagined. This is probably Zhang Lan's DNA." "Yes." Lu Weiwei was also very sure: "we can extract DNA from these tissues and compare it with Zhang Lan's father. If these samples are consistent with Zhang Lan's father's DNA samples, then we have enough evidence." "Take that wooden stool back." Guchen gets up and goes straight out of the bathroom. Lu Weiwei is careful to take the wooden stool that good, from the equipment bag, take out a large transparent forensics bag, the wooden stool wrapped in it. Seeing Gu Chen and Lu Weiwei come out from the bathroom and have been looking at Zhu Lei's police officer Wang, this quickly chased and asked: "how?" "There was a lot of blood in the bathroom, and we found suspected human tissue on the inside of the wooden stool in the toilet and on the wall of the sewer pipe." "People Human tissue? " On hearing this term, Lu Min and he Lu can't help but look at each other. They soon understood what Gu Chen meant. They were so frightened that they held each other together. "Why How could this happen? How could there be so much blood? How can there be human tissue? ""Is it that Zhang Lan is Is she really dead? " "My God! How could this happen? " Gu Chen walked up to Zhu Lei, grabbed Zhu Lei's collar and asked coldly, "who did you sell that sofa chair to?" "Just Just one piece of junk. " Hearing what Gu Chen said just now, Zhu Lei is also flustered. In the face of Gu Chen's sharp eyes, his legs even soften and his eyes keep avoiding. "Lu Min and he Lu, you two go to the garden on the first floor to see if there are any suspicious signs of burial in the garden on the first floor." Gu Chen said. "Good Good. " At the moment, the two men were also in panic. They had not dared to stay on the underground floor of this shady and dry place. When Gu Chen's voice dropped, he also hurried to the garden on the first floor to look for yuan Shasha. At this moment, Gu turned on all the lights on the first floor and continued to collect strong evidence in every corner of the room. It seems that Lu Weichen has a new sword under her. It seems that she has a knife under her "Let me see." Gu Chen squats down and quickly takes over the sharp weapon from Lu Weiwei. This is a machete with beautiful appearance. Gu Chen finds it very clean, but judging from the color of the blade, it seems to have been baked. Gu Chen did not say a word, spray the remaining fluorescent agent on the blade, looking forward to all show. However, to Gu Chen's surprise, the fluorescent agent did not seem to play a significant role in the blade. Gu Chen could not help frowning: "is it that the things on it have been decomposed?" "From the blade point of view, this is obviously used, you see, the blade is from the gap." Said Lu Weiwei, pointing to a gap. Gu Chen nodded slightly and said, "yes, there are signs that there is a small amount of blood on the chopper." "But maybe it's because there's too little blood, and the fluorescent doesn't seem to react much." "Try again with the reagent." Wang said. Gu Chen nodded and agreed, thinking that if we could detect a little bit on the blade, many problems could be solved if we could extract blood DNA. www.mylovenovel.com , the fastest update of the webnovel!
