In general, it is not very likely that a fall is a murder. From the analysis of the probability of falling from the building that has occurred, the proportion of suicide falling from the building accounts for more than 80 percent.

The remaining 20 percent, and half of it was an accidental fall. Less than 10 percent of people actually killed people by falling from buildings.

At that time, the current survey was done by Liu Guodong. The woman who fell from the building had traces of being violated before her death, and it was a violent assault.

This is when the nature of the case is determined. And all the clues are only a fingerprint and bodily fluids collected from the deceased's lower body.

Because of the contamination of body fluids, the quality of the fingerprints collected is very poor. The blurry photo doesn't look very real, like a secondary remake.

Fingerprint extraction on human skin is the most difficult of all fingerprint extractions. When Liu Guodong took fingerprints at that time, he adopted the iodine smoking method.

However, due to the fact that there are sweat glands and oil glands on the surface of the deceased's body, coupled with the interference of body fluids, the fingerprints collected are very unsatisfactory.

Of course, even so, Lu Chuan judged with the skills of intermediate spot surveying, and Liu Guodong had already reached the limit at that time.

At the very least, it is very powerful to be able to find this fingerprint. The buzzing sound of the computer fan roared again, and the sound of keyboard tapping sounded regularly.

In the conference room, everyone, you look at me, I look at you, and I know that Lu Chuan is processing fingerprints again.

"It's ...... The sixth, right? ”

"If you succeed in three pieces, you will have three lives......" This person may not refer to the victim, but also to the murderer.

The murder suspect is at least indefinite if he is caught. Now the death penalty sentence is not like before, unless it is a major case, the impact is bad, or the subjective criminal malice is very obvious, otherwise, most of them are indefinite.

Every time Lu Chuan succeeds in fingerprint comparison, it not only means that the victim is wronged, but also means that a person has been sent to prison.

The computer was howling, howling wildly. There is a feeling of a female bodhisattva who is blocked in a dead end by several big men.

The meaning of hysteria is obvious.

"The next time I suggest that the bureau will have a fingerprint battle, get a few better computers, it's too loud."

"The key is to affect the progress of our fingerprint comparison...... "The processing of fingerprints was quite smooth, and it took less than two hours for the pre-processing of fingerprints to be almost over."

Looking at the fingerprints on the screen that were getting clearer and clearer, Gao Wenxiang's face on the side was flushed, and he was excited.

"It's almost there...... Well? However, Gao Wenxiang soon realized that something was wrong. As a qualified fingerprint identification criminal policeman, although the technical gap between Gao Wenxiang and Lu Chuan is like a chasm.

However, it doesn't mean that Gao Wenxiang can't. On the contrary, he was also transferred from the police station as a genius by the leader back then.

A fingerprint, whether I have seen it or not, Gao Wenxiang remembers it very clearly. And the fingerprints on Lu Chuan's screen gave Gao Wenxiang a very familiar feeling, déjà vu, but separated by a layer of window paper.

"Brother Gao...... Feeling familiar? Lu Chuan's feeling is even stronger than Gao Wenxiang's. Familiar fingerprints, as if you have just seen them.

Gao Wenxiang nodded affirmatively: "You also feel familiar?" Suddenly, the two of them had a blank expression. The fingerprints that the two have seen together, and there are only two that have not been successfully compared.

One is the fingerprints of Zheng Bin's murder made by Lu Chuan yesterday afternoon. The other one is the first homicide fingerprint done today, and there is no successful match in the system.

Lu Chuan immediately operated the system and turned out the two pre-processed fingerprints in Zheng Bin's case and this morning's case.

After the two fingerprints have been processed, they are already relatively clear.

"Zheng Bin!" Gao Wenxiang could see at a glance which fingerprint was similar to the fingerprint of the falling case. It was the fingerprints left on the murder weapon at the scene of Zheng Bin's murder.

Wang Song heard Gao Wenxiang shouting Zheng Bin, and immediately raised his head: "Old Gao? What's wrong? Yesterday afternoon, Wang Song waited with hope for Lu Chuan's appraisal results.

But unfortunately, the comparison failed, and the target person did not leave a fingerprint sample in the fingerprint system.

"Lao Wang, come here, compare! The fingerprints of Zheng Bin's case are compared! After two or three breaths, everyone gathered behind Lu Chuan.

Wang Song's eyes were about to sink into the screen.

"Who? Who is it? "Yesterday there was no match, but today it was matched!

"There is no information about the other party, but the person who killed Zheng Bin should be the same person as the murderer in the Qingjian Community falling from the building five years ago." The person who killed Zheng Bin was the murderer of the fall from the building in the Qingjian community five years ago?

Wang Song's face changed, he had heard of the case five years ago and knew that it was a case handled by the criminal investigation detachment.

"Repeat offenders?"

"Killed a police officer nine years ago, and killed a strong man five years ago?" Sun Hao's brows furrowed, he knew both cases.

They were all involved in the case back then, but obviously, there was no valuable news. Wang Song's face was even more gloomy.

Although the fingerprint comparison shows that the murderer in the two cases is the same person, what can that be. The murderer killed Zheng Bin in the mountains nine years ago, and the case was not solved.

Five years ago, he killed people in the Qingjian community, but the case has not been solved. Everyone chatted and discussed the two cases of the year.

"Is there any possibility of re-investigating the case from five years ago?"

"It's just this case...... It's unlikely, but if you add Zheng Bin...... You can try. "The backlog of homicide cases will never be abandoned, but the police resources invested are always limited.

Therefore, in general, in the absence of major clues, the homicide backlog will not be re-investigated.

Unless, there is a significant change in the nature of the case. A murderer, killing two people, is actually not qualified.

Serial murders have gone on. And most of them have not been solved, and I have not heard that the case has been reopened.

The reopening of an investigation is different from a follow-up in the general sense, and the criteria for reopening an investigation are based on the criteria for a new case.

"Let's apply first, it's unlikely to restart, but ...... It should be fine with two days. Lu Chuan checked the information, and Ren Qiang was responsible for the falling case five years ago.

Taking advantage of the rest, Lu Chuan called Ren Qiang.

"The murderer in the case five years ago and the Zheng Bin case nine years ago is the same person?" Ren Qiang was a little shocked. In the two cases, the former was mainly handled by him, and the latter victim Zheng Bin was a police officer he joined in the same class, and the relationship between the two was good.

"There's no further clue yet." Although Lu Chuan has made discoveries here, it is not very useful for catching suspects.

"My fingerprint battle here will be over in five days, and I'll go back and look at the file then." Hanging up the phone, Ren Qiang sighed deeply.

Thinking back to the case five years ago, it seems as if it happened yesterday. and Zheng Bin, at that time, Zheng Bin was just going to be a father.

After sorting out his mood, Ren Qiang went to the archives and found the file and physical evidence file of the falling case five years ago.

Unlike Zheng Bin, who was killed in the wild, the falling case actually made great progress. The range of suspects targeted is relatively small.

After all, when the building fell, there were so many people in the whole building. It's not hard to screen everyone.

Even, at that time, the entire street, people in more than a dozen nearby communities, collected fingerprints and DNA information.

Unfortunately, the fingerprint comparison was not successful. In terms of DNA information, there has also been no significant progress.

However, based on the time of reporting the crime at the time, it can be determined that the murderer should have been nearby at the time, and he did not even come out of the building.

Who is it?