Chapter 155 He is not the murderer
After Zhang Wei was arrested, he cooperated very well with the pre-trial.
“Two days ago, at about seven o’clock in the evening, I was driving a taxi near the meat factory, and I picked up the woman on the way.”
The encounter between the two was originally very ordinary. The relationship between passengers and taxi drivers.
However, the two quarreled because of a few quarrels.
"I didn't want to kill her at first. It's all her fault."
In Zhang Wei's words, Wang Guizhi looked down on him. After getting in the car, Zhang Wei took the initiative to chat.
“In our line of work, one drives alone for a whole day, and the passengers usually chat a few words when they get in the car.”
“But that woman said that I have a crush on her. , to harass her.”
“Where did you do it?”
"It's over there at Cold Storage No. 8. I use a swing stick. I have a swing stick in my car, which I use for self-defense."
In the interrogation room, Zhang Wei began to explain the incident.
Including the reason for the conflict between the two, the place where Zhang Wei committed the murder, and the method of killing, everything was clearly explained.
“After killing her, I put her into the No. 8 cold storage and froze her for a while. I was afraid that there would be blood stains when I dismembered her body, which would make it difficult to dismember her body.”
“Dismember her body. What about the tools? ”
"Hidden in the cold storage."
"Why dump the body in Folk Street?"
"I ate at Folk Street last month, and a fly ate out of the noodle shop. They didn't accompany me. My money."
"I thought about throwing it there to disgust them..."
Zhang Hui interrogated, and Ren Qiang sent someone to find the third person according to Zhang Wei's instructions. One spot.
Sure enough, the first scene was discovered near Cold Storage No. 8.
The dismemberment scene was also found in the cold storage, and the tools for dismemberment were successfully found.
In addition to these, more than twenty plastic bags that were not discarded were also found in the trunk of Zhang Wei's taxi.
Contained inside are the remaining parts of Wang Guizhi’s body.
The corpse dismemberment case in Folk Street has been completely solved.
What follows is all procedural work.
Inspection of the first scene, investigation of the dismemberment site, and sorting of the remaining corpses.
In addition, information such as height, fingerprints, DNA information, and blood type must be collected for the murderer.
Next, in about a week, all the files will be sorted out and handed over to the criminal investigation detachment.
Now surveying the office.
"Xiao Lu, you are responsible for the information on the suspect."
Liu Guodong wrapped his coat and called to Yang Sen and Lao Bai: "We will go to the scene first."
A few people After saying hello, everyone started to prepare.
Detention room.
Lu Chuan met Zhang Wei.
He has a Chinese character face, dark skin, and thick eyebrows.
Perhaps because of driving a taxi all year round, Zhang Wei is a little hunchbacked.
Before being transferred to the detention center, Zhang Wei will be temporarily detained in the Criminal Investigation Detachment, but he will not always be in the interrogation room.
The Criminal Investigation Detachment has two special detention rooms on the first floor, which are used to detain criminal suspects for a short period of time.
Tomorrow, Zhang Hui will complete the relevant procedures and send the person to the detention center.
Lu Chuan heard from Lao Bai that there was an unwritten rule in the detention center. Generally, suspects who had committed murder crimes would not be locked up with other people as long as the cell had enough space.
In the detention room, Zhang Wei curled up and leaned in the corner.
Height, weight and other basic information have just been measured by the criminal police. Lu Chuan came here mainly to test the blood type, print fingerprints, and extract DNA samples for examination.
"Am I going to die?"
Zhang Wei was very cooperative with Lu Chuan's work, lifting his arms, drawing blood, and pulling back his hair without blinking.
Lu Chuan nodded seriously: "If you really kill the person, he will die."
Killing does not necessarily mean death, it may be indefinite.
But the dismemberment of the body after killing is extremely bad in nature and has a huge impact, so the death penalty is not an option. "Death..."
Zhang Wei murmured to himself, not caring about Lu Chuan's departure.
After leaving the detention room, Lu Chuan still had work to complete.
The process of a murder case is far more complicated than most people imagine.
This is another corpse dismemberment case, and the information that needs to be sorted out can fit into a storage box.
In the current survey laboratory, Lu Chuan processes the collected test materials.
Fingerprint entry, blood type testing, hair follicle treatment...
Um?
Lu Chuan, who had just recorded his fingerprints in the system, was using blood type test strips to test Zhang Wei's blood type.
"Blood type A?"
Lu Chuan thought he had made a mistake, and compared the color of the test paper again, it was indeed blood type A.
But, this is not right.
"Is there something wrong with the test strip?"
The blood types of all animals, including human blood types, refer to the specific antigen types on the red blood cell membrane.
There are actually two systems of human blood types.
A well-known ABO blood group system, the blood group of this system analyzes human blood types into four types: A, B, AB and O based on specific antigen types.
But in addition to the above blood types that most people have, there is another blood type classification system.
It is the RH blood group system. The RH negative blood often heard in the news is the specific type classified by this blood group system.
Confirmation of blood type is the basic skill of blood stain morphology analysis.
In the past, blood type testing required special chemical reagents, which was quite troublesome to check.
Now it is much more convenient. Just drop a drop on the test paper and according to the color change of the test paper, you can determine the blood type.
Of course, in actual use, the accuracy of the test strip is not necessarily 100%.
For example, now, Lu Chuan has detected that Zhang Wei's blood type is type A, but this is inconsistent with the blood type of the dripping blood stains that Lu Chuan extracted from the broken corpses.
That blood type is AB.
The blood type of the victim Wang Guizhi is type O.
In other words, the blood dripping that Lu Chuan found on the broken corpses was not Wang Guizhi's, so it most likely belonged to the murderer.
But if Zhang Wei was the murderer, how could the blood dripping from his blood be different from his own blood type?
Lu Chuan took out another test paper and did another experiment.
Blood type A!
Still type A blood!
Why does this happen?
Two possibilities. The first is that there is something wrong with the blood type test of the dripping blood stains extracted by Lu Chuan from the corpse.
However, because the drop-shaped blood stains had dried up, it was impossible to use test strips to detect the blood type. Lu Chuan used primitive chemical reagent methods.
The probability of errors in this method is extremely low.
Another situation is that there is something wrong with the test strips Lu Chuan is using now.
The blood type test strips in the current investigation laboratory are replenished once a year. The current test strips were available before Lu Chuan went to work.
Looking at the production date, it has been two years.
Although it has not expired, if there is a problem during storage or transportation, the test strip may become invalid.
There must be no mistakes in a murder case.
Lu Chuan gave up the test paper detection method this time and used chemical reagents directly.
In the beaker, a drop of bright red blood was dropped into the chemical reagent, and the color changed instantly.
The color card next to it and the color of the reagent in the beaker are getting closer and closer.
Three minutes later.
Type A!
Zhang Wei’s blood test result is type A blood!
After the result was confirmed, Lu Chuan’s expression changed drastically.
Zhang Wei...maybe not the murderer at all!
(End of this chapter)