After Zhang Wei was arrested, he cooperated very much with the pre-trial.

"Two days ago, at about seven o'clock in the evening, I drove a taxi near the meat factory, and the woman I pulled up halfway." The meeting between the two was originally a very ordinary relationship between a passenger and a taxi driver.

However, the two quarreled because of a few words.

"I didn't think about killing her at first, I blamed her." In Zhang Wei's words, Wang Guizhi looked down on him, and after getting in the car, Zhang Wei took the initiative to chat.

"In our line of work, one person drives, one day is a day, and passengers usually talk a little bit when they get on the bus."

"But that woman said that I had a crush on her and wanted to harass her."

"Where did you move your hand? What to kill people with? ”

"It's over there in the No. 8 cold storage, I use a throwing stick, and I have a throwing stick in my car, which I usually use for self-defense." In the interrogation room, Zhang Wei began to explain the process of the case.

Including the reasons for the conflict between the two, the location where Zhang Wei killed the people, and the way of killing, they are all explained very clearly.

"After killing her, I put her in the No. 8 cold storage and froze for a while, I was afraid that there would be blood stains when the body was divided, and it would be difficult to get it."

"Where's the tool for dismemberment?"

"Hidden in cold storage."

"Why are you throwing corpses in Folk Street?"

"I ate at Folk Street last month, and I ate a fly at the Noodle Burning Restaurant, and they didn't pay for me."

"I'm thinking about throwing it there, disgusting them......" Zhang Hui interrogated here, and Ren Qiang sent someone to find the first scene according to Zhang Wei's explanation.

Sure enough, the first scene was found near Cold Storage No. 8. The scene of the dismemberment was also found in the cold storage, and the dismemberment tools were successfully found.

In addition to these, in the trunk of Zhang Wei's taxi, more than two dozen plastic bags were found that had not been discarded.

It contained the remaining parts of Wang Guizhi's corpse. The corpse shredding case in Folk Street was completely solved.

The rest is all about the process. The investigation of the first scene, the investigation of the site of the dismemberment, and the sorting of the remaining corpses.

In addition, information such as height, fingerprints, DNA information, and blood type should be collected for the murderer. Next, in about a week, all the archives will be sorted out, and the criminal investigation detachment will be able to hand them over.

Survey Office.

"Xiao Lu, you are responsible for the information on the suspect's side." Liu Guodong wrapped himself in a coat and greeted Yang Sen and Lao Bai: "Let's go over there first." Several people greeted each other and began to prepare.

Detention cell. Lu Chuan met Zhang Wei. He has a Chinese face, dark skin, and thick eyebrows. Perhaps because of the perennial taxi drive, 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 be in the interrogation room all the time.

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 Lao Bai say that there is an unwritten rule in the detention center, and generally this kind of suspect who has committed homicide will not be locked up with others as long as the cell is sufficient.

In the detention room, Zhang Wei curled up and leaned against the corner. Basic information such as height and weight has just been tested by the criminal police, and Lu Chuan came over mainly to test blood type, rub fingerprints, and extract DNA samples for examination.

"Am I going to die?" Zhang Wei was very cooperative with Lu Chuan's work, raising his arms, drawing blood, and cutting his hair, without blinking his eyes.

Lu Chuan nodded seriously: "If you really kill someone, you will die." "Murder is not necessarily death, it may be indefinite.

However, the dismemberment of the body after killing is of an extremely bad nature and has a huge impact, and the death penalty is gone.

"Mortal ......" Zhang Wei muttered to himself, indifferent to Lu Chuan's departure. Leaving the detention cell, Lu Chuan still has work to complete.

The process of murder is far more complex than most people think. This is another case of corpse mutilation, and the information that needs to be sorted out here can be packed into a storage box.

In the current laboratory, Lu Chuan processed the collected samples. Fingerprint entry, blood group detection, hair follicle processing...... Well?

Lu Chuan, who had just finished recording fingerprints in the system, was using blood group test strips to test Zhang Wei's blood type.

"Blood type A?" Lu Chuan thought that he had read it wrong, and re-compared the color of the test strip, it was indeed blood type A.

But that's not right.

"Got a problem with the test strip?" The blood type of all animals, including human blood group, refers to the type of antigen specific on the red blood cell membrane.

There are actually two systems of human blood type. A well-known ABO blood group system, this type of blood group, according to the specific antigen type, human blood groups are analyzed into four types of blood types: A, B, AB and O.

But in addition to the blood type that the vast majority of people have above, there is another blood group classification system. It is the Rh blood group system, and the Rh negative blood that I often hear about in the news is the specific type of this blood group system.

Confirmation of blood type is the basic skill of blood morphology analysis. In the past, blood group testing required specialized chemical reagents, which was cumbersome.

Now it is much more convenient, a drop on the test strip, according to the color change of the test strip, you can determine the blood type.

Of course, in the actual use process, the accuracy of the test strip is not necessarily 100%. For example, now, Lu Chuan has measured Zhang Wei's blood type A, but this is inconsistent with the blood type of the dripping blood stains extracted by Lu Chuan on the broken corpse.

Its blood type is AB type. The blood type of the victim Wang Guizhi is type O. In other words, the dripping blood stains found by Lu Chuan on the broken corpse were not Wang Guizhi's own, so there was a high probability that they were the murderer's.

However, if Zhang Wei is a murderer, how can the blood dripping be different from his own blood type? Taking out a test strip again, Lu Chuan did another experiment.

Blood type A! Or blood type A! Why is this happening? There are two possibilities, the first is that there is a problem with the blood group detection of the dripping blood stains extracted by Lu Chuan from the corpse.

However, because the dripping blood stains had dried up, it was impossible to use test strips to detect blood type, so Lu Chuan used the original chemical reagent method.

The probability of error in this approach is extremely low. Another situation is that there is a problem with these test strips that Lu Chuan is using now.

The blood group test strips in the current laboratory are replenished once a year, and these test strips are still available before Lu Chuan went to work.

Looking at the production date, two years have passed. Although it has not expired, it is possible that the test strip may fail due to a problem during storage or transportation.

There must not be the slightest mistake in a murder case. Lu Chuan gave up the test strip detection method this time and directly used chemical reagents.

Inside the beaker, a drop of bright red blood dripped into the chemical reagent, and the color changed in an instant. Next to the color card and beaker of the reagent color is getting closer and closer.

Three minutes later. Type A! Zhang Wei's blood test result is blood type A! After determining the result, Lu Chuan's expression changed greatly.

Zhang wei...... Maybe not a murderer at all!