Because this group of people confirmed the identity of the other party this morning and had a meeting immediately, so before they had time to do the following work, Chen Jiang brought the relevant investigation results to the case analysis meeting.
Although Chen Jiang's entire reporting process was not long and relatively short, everyone knew how difficult it was to find one person to troubleshoot so many surveillance cameras.
The actual situation is indeed the case. Chen Jiang and the others arranged this group of people, a total of eight people. They slept for less than 10 hours in these three days and three nights, and spent the rest of the time checking surveillance videos.
But Huangtian paid off, and in the end it was Chen Jiang and the others who discovered important clues. If this case was solved, it would be this group of people who would be rewarded for their meritorious service.
Whether it is investigating criminal cases or various other types of cases, it is actually very boring.
For example, when investigating some criminal cases, in order to dig up evidence, it is inevitable that criminal suspects will be monitored.
However, criminal suspects do not hide or destroy evidence because they have committed a crime. Sometimes they do not necessarily present criminal evidence, even if they know that they are not being monitored.
So in this case, this monitoring may last for a long time.
The same is true for some squatting stations. In order to squat some criminal suspects may appear in a certain place, the criminal police handling the case may squat in this place for a day or two, or even 10 or 20 days, or even a month or more.
Wang Zhaokai and the others have experienced cases like this before.
It is common to stay in one place for a week or even a month. During this period of stay, it seems relatively normal, but in fact it is not possible to lose sight of it.
Because the suspect may appear at that moment. If you miss this moment, your previous hard work will be in vain.
So why do two people take turns going to the toilet at the squatting station, and one person has to keep a close eye on the suspect? This is the reason why he is likely to appear in the place.
So sometimes the instant noodle walls can be as high as a wall, which is not an exaggeration.
For example, this case is tight on time and has heavy tasks.
, 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 incident to the present, and has basically not left the office during this period.
Investigation and monitoring are easier to say, but very cumbersome, energy-consuming, and torturous to do.
The entire surveillance may last for more than ten hours or even more than ten or twenty hours, but the time period during which the criminal suspect passes may be one second, two seconds or even shorter.
Therefore, if you want to find a criminal suspect, you have to keep an eye on the entire surveillance system. Going through the whole process frame by frame is actually very tedious and boring.
Sometimes you can't find it, and you have to go back and look for some clues.
Similar to this is the identification of fingerprints and DNA information.
Fingerprint comparison is an old pedestrian method that most people may be familiar with, but DNA identification is not.
The DNA identification that most people have in mind 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.
Among all DNA information identifications, the simplest one should be said to be the DNA information identification of blood.
But even for DNA information identification of blood, after collecting the blood, the blood must be centrifuged to separate all plasma, white blood cells, and red blood cells.
The inspection materials are then processed using PCR amplification.
After this solution is extracted, the DNA can then be mapped or analyzed and drawn through specific instruments. The so-called DNA information determination actually has considerable technical barriers.
Because the DNA information similarity between any two people can reach more than 99.9%.
The 99.9% project mentioned here means that the DNA information of any two strangers has at least 99.9% of the DNA information map completely overlapping without any difference.
Because these overlapping items are the basic genetic information of these two people as human beings.
Only 0.1% of different personality displays can make differential analysis and judgment.
Therefore, even if the genetic maps of two people are shown to a person who does not understand technology, he will not be able to tell the relationship between the genes of the two people. Is it a homologous gene or a parent-child inheritance, or is it the genes of two completely different people?
The case analysis meeting ended soon, and there was finally a clear clue about Tang Meijuan's suicide or homicide.
The process of arresting the engineering company boss went smoothly. The police took him out when he was at home.
Collecting blood for DNA identification and analysis can be completed quickly.
Interrogation room.
Check out the 16-9 book bar and see the correct version!
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, Zhang Lei almost couldn't stand up. But now Zhang Lei's performance is much better and he can at least sit upright.
"No...I don't know..."
"Don't know?"
Chen Jiang put down the signature pen in his hand.
"Zhang Lei, I collected your blood just now when you came here. Do you know why?"
"No...I don't know."
hehe.
"I can tell you clearly that we found hair left by some people in the ventilation duct on the rooftop of a distant building. We will compare it through DNA testing and your blood DNA testing information. If these two comparisons are successful, then Tell me why your hair is in the air ducts?"
When Zhang Lei heard the words ventilation duct, his face suddenly turned pale.
"I..."
"I can give you a time. The identification of the DNA information will not come out until 5 hours later. You still have time to consider that before we get the conclusive evidence, you still have the possibility of being frank and leniency. But if we get the evidence once , even if you confess and be lenient, it will not help us to convict with zero confession at that time.”
"I..."
"In addition, don't think that what you did was perfect, and don't think that it was too much. One day before Tang Meijuan's death, you hid on the rooftop and this matter was over. Did you forget about you? How many bottles did you bring with you at that time? Use pure water to kill Tang Meijuan. Did we leave purified water on the rooftop afterwards? We also conducted information testing on that purified water and found biological DNA information in it. Once compared with your information, Zhang Lei, think about it for yourself. "(This chapter! End)