Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Because this group of people confirmed the other party's identity this morning and had a meeting right away, they did not have time to do the following work. Chen Jiang brought the relevant investigation results to this case analysis meeting.

Although Chen Jiang's entire reporting process was not long and was relatively short, everyone knew how difficult it was to find someone after checking so many surveillance videos.

This is indeed the actual situation. Chen Jiang and his team arranged this group of people, a total of 8 people. They slept less than 3 hours in these three days and three nights, and spent the rest of the time checking surveillance videos.

But God helps those who work hard, and finally General Chen and his team found the important clues. If the case is solved, this group of people will be rewarded for the meritorious service.

Whether it is investigating criminal cases or other types of cases, it is actually very boring.

For example, when investigating criminal cases, it is inevitable to monitor the suspects in order to dig up evidence.

However, there is no reason for a criminal suspect to hide or destroy evidence after committing a crime. Sometimes he does not necessarily present evidence of the crime, even if he knows that he is not being monitored.

So in this case, this surveillance may last for a long time.

The same is true for some situations where police officers may stake out a criminal suspect who may appear in a certain place, so they may stake out the case for a day, two days, 10 days, 20 days, or even a month or longer.

Wang Zhaokai and his colleagues have experienced this kind of case many times in the past.

It is common to stay on site for a week or even a month, and although the process may seem normal, in fact, you cannot be distracted for even a moment.

Because the suspect may only appear for a moment, if you miss this moment, all your previous hard work will be in vain.

That is why when staking out a spot, two people have to take turns going to the toilet. One person must keep a close eye on the suspect and keep him/her in any place where he/she may appear.

So sometimes instant noodles can be piled up as high as a wall, and this is not an exaggeration.

For example, this case is time-sensitive and has a heavy workload.

The group of criminal police assigned by Chen Jiang to investigate the Yuanfang Building has basically had a clear outline of the case from the beginning of the incident to now, and they have basically not left the office during this period.

Investigation and surveillance are relatively easy to say, but they are extremely tedious, energy-consuming, and torturous to do.

The entire surveillance may be more than ten hours or even more than ten to twenty hours, but the period of time that the suspect passes by may be only one or two seconds or even shorter.

Therefore, if you want to find the suspect, you have to stare at the entire surveillance video frame by frame, which is actually very tedious and boring.

Sometimes I can’t find it, and I have to go back and look for some clues.

Similar to this is the identification of fingerprints and DNA information.

Fingerprint matching is an old pedestrian method that most people may be familiar with, but DNA identification is not.

In the general public's inherent impression, DNA identification is to put the collected biological information directly into a container or instrument for extraction, and the DNA information will come out directly.

But it's not.

The simplest of all DNA information identifications is probably the DNA information identification of blood.

But even for DNA identification of blood, the blood must be centrifuged after being collected to separate the plasma and white blood cells and red blood cells.

The inspection material is then processed using PCR amplification.

After the solution is extracted, the DNA can be mapped or analyzed and drawn through specific instruments. However, the so-called DNA information determination actually has considerable technical barriers.

Because the similarity of DNA information between any two people can reach more than 99.9%.

The 99.9% of the projects mentioned here mean that the DNA information of any two strangers has at least 99.9% of their DNA information maps completely overlapping, with no difference at all.

Because these overlapping items are the basic genetic information of these two people as human beings.

Only when 0.1% of different personalities are displayed can differential analysis and judgment be made.

Therefore, even if the genetic map of two people is shown to a person who does not understand technology, he cannot tell the relationship between the genes of the two people, whether they are homologous genes or parent-child inheritance, or whether they are genes of two completely different people.

The case analysis meeting will be over soon, and there will finally be a clear clue pointing to the case of Tang Meijuan's suicide or homicide.

The process of arresting the boss of the engineering company went smoothly, and he was brought out by the police when he was at home.

Collecting blood for DNA identification and analysis were all done quickly.

trial room.

The person responsible for auditing the other party is Chen Jiang.

"Zhang Lei, do you know why I invited you here today?"

Zhang Lei was very nervous. When he was arrested at home, he almost couldn't stand up. But now Zhang Lei's performance is much better, at least he can sit up straight.

"No...don't know..."

"do not know?"

Chen Jiang put down the pen in his hand.

"Zhang Lei, I took your blood when you came here just now. Do you know why?"

"No...don't know."

Ha ha.

"I can tell you very clearly that we found someone's hair in the ventilation duct on the rooftop of Yuanfang Building. We will compare it with your blood DNA test information through DNA testing. If these two comparisons are successful, then we need to explain why your hair appeared in the ventilation duct?"

When Zhang Lei heard the words "ventilation duct", his face suddenly turned pale.

"I……"

"I can give you time. The DNA identification will not be available until five hours later. You still have time to consider it. Before we get solid evidence, you may still be able to confess and get leniency. But once we get the evidence, even if you confess, it will be useless. At that time, we can convict you without a confession."

"I……"

"Also, don't think that what you did was perfect. Don't think that you hid on the rooftop the day before Tang Meijuan's death, and this matter is over. Have you forgotten that you brought a few bottles of purified water with you before killing Tang Meijuan. Did you leave purified water on the rooftop? We also conducted an information test on the purified water and found biological DNA information in it. Once it is compared with your information, Zhang Lei, think about it yourself!" (End of this chapter)