After Zhang Wei was arrested, he cooperated very well with the pre-trial.
"Two nights ago, at about seven o'clock in the evening, I was driving a taxi near the meat factory, and I picked up this woman on the way." The encounter between the two was a very ordinary relationship between a passenger and a taxi driver.
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, a person drives alone for a whole day. Passengers usually chat a few words when they get in the car."
"But that woman said that I was attracted to her and wanted to harass her."
"Where did you move your hands? What did you use to kill people?"
"It's over there at Cold Storage No. 8. I use a swing stick. I have a swing stick in my car. It's usually used for self-defense." In the interrogation room, Zhang Wei began to explain the incident.
Including the reason for the conflict between the two people, the place where Zhang Wei committed the murder, and the method of killing, everything was clearly explained.
"After I killed her, I put her into cold storage No. 8 and froze her for a while. I was afraid that there would be blood stains when I dismembered her body, which would be difficult to dispose of."
"Where are the tools for dismembering the body?"
"It's hidden in the cold storage."
"Why dump the body in Folk Street?"
"I ate at the Folk Street last month and I was like a fly at a noodle restaurant. They didn't give me any money."
"I thought about throwing it over there to disgust them..." Zhang Hui interrogated, while Ren Qiang sent people to find the first scene according to Zhang Wei's instructions.
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 20 plastic bags that were not discarded were also found in the trunk of Zhang Wei's taxi.
What was inside was 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. The investigation of the first scene, the investigation of the dismemberment site, and the sorting of the remaining bodies.
In addition, information such as height, fingerprints, DNA information, blood type, etc. 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.
The current survey 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: "Let's go to the scene first." Several people greeted each other and began 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 remain in the interrogation room.
There are two special detention rooms on the first floor of the Criminal Investigation Detachment, 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. Basic information such as height and weight had just been measured by the criminal police. Lu Chuan came here mainly to test blood type, print fingerprints, and extract DNA samples for examination.
"Am I going to die?" Zhang Wei cooperated with Lu Chuan's work, raising 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.
However, killing someone and dismembering their body 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 murder 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...huh?
Lu Chuan, who had just recorded his fingerprints in the system, was using blood type test strips to test Zhang Wei's blood type.
"Type A blood?" Lu Chuan thought he had made a mistake, and compared the color of the test paper again, it was indeed type A blood.
However, this is not right.
"Is there something wrong with the test strip?" The blood group of all animals, including humans, refers to the specific antigen type 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 that we often hear about 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 specialized 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 type 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.
However, 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.
Type A blood! Still type A blood! Why does this happen? There are two possibilities. The first is that there is something wrong with the blood type test of the dripping blood stains that Lu Chuan extracted 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 error with 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.
I looked at the production date and saw that it had 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 directly used chemical reagents.
In the beaker, a drop of bright red blood was dripped into the chemical reagent, and the color changed instantly. The color of the reagent on the color chart next to the beaker is getting closer and closer.
Three minutes later. Type a! Zhang Wei’s blood test result is type A blood! After confirming the result, Lu Chuan's expression changed drastically.
Zhang Wei...maybe not the murderer at all!
