Generally speaking, it is not very likely that a fall is murder. Based on the analysis of the probability of falling cases that have occurred, the proportion of suicide cases accounting for more than 80%.
Of the remaining 20 percent, half were accidental falls. Less than 10% of people actually kill people by falling from buildings.
The current survey at that time was done by Liu Guodong. The woman who fell from the building showed signs of being assaulted before her death, and the assault was violent.
This determined the nature of the case. All the clues were a fingerprint and body fluid collected from the deceased's private parts.
The quality of collected fingerprints is very poor due to contamination with body fluids. The blurry photos don’t look very clear, they look like they were re-photographed.
Extracting fingerprints from human skin is the most difficult of all fingerprint extractions. When Liu Guodong extracted fingerprints, he used the iodine fumigation method.
However, since the surface of the dead body also contains secretions from sweat glands and oil glands, coupled with the interference of body fluids, the collected fingerprints are very unsatisfactory.
Of course, even so, judging from Lu Chuan's intermediate spot survey skills, Liu Guodong had already reached his limit at that time.
At the very least, it would be very impressive to be able to find this fingerprint. The buzzing computer fan roared again, and the sound of keyboard typing also sounded regularly.
In the conference room, everyone looked at me and I looked at you, knowing that Lu Chuan was processing fingerprints again.
"Is this...the sixth one?"
"Three successes means three lives..." This person may not be referring to the victim, but may also be referring to the murderer.
A murder suspect will at least have no chance of getting caught. Nowadays, the death sentence is not like before. Unless it is a major case, the impact is bad, or the subjective criminal malice is very obvious, otherwise, it is mostly life-long.
Every time Lu Chuan's fingerprint comparison is successful, it not only means that the victim is exonerated, but also means that one person is sent to prison.
The computer was howling, howling like crazy. It feels quite like a female Bodhisattva who is blocked in a dead end by a few big men.
The meaning of hysteria is obvious.
"Next time I suggest that the bureau get some better computers when there is another fingerprint battle. This sound is too loud."
"The key is to affect the progress of our fingerprint comparison..." The fingerprint processing went smoothly. It only took less than two hours, and the fingerprint pre-processing was almost completed.
Looking at the increasingly clear fingerprints on the screen, Gao Wenxiang's face flushed and excited.
"It's almost done...huh?" However, Gao Wenxiang soon discovered something was wrong. As a qualified fingerprint identification criminal police officer, although the technical gap between Gao Wenxiang and Lu Chuan is as big as a gulf.
However, it does not mean that Gao Wenxiang cannot do it. On the contrary, he was also transferred from the police station by the leader as a genius.
A fingerprint, whether seen or not, Gao Wenxiang remembers it very clearly. The fingerprints on Lu Chuan's screen gave Gao Wenxiang a very familiar feeling, like deja vu, but separated by a layer of window paper.
"Brother Gao... does it feel familiar?" Lu Chuan's feeling was stronger than that of Gao Wenxiang. Familiar fingerprints, as if you had just seen them.
Gao Wenxiang nodded affirmatively: "You feel familiar too?" Suddenly, the two of them looked at each other. Of the fingerprints the two of them looked at together, there were only two fingerprints that were not successfully matched.
One is the fingerprints taken by Lu Chuan yesterday afternoon for Zheng Bin’s murder. The other one was the first murder fingerprint made today, and there was no successful match in the system.
Lu Chuan immediately operated the system and found two pre-processed fingerprints from Zheng Bin's case and this morning's case.
After processing, the two fingerprints are relatively clear.
"Zheng Bin!" Gao Wenxiang could tell at a glance which fingerprint was similar to the fingerprint in the falling case. It was the fingerprints left on the murder weapon at the scene of Zheng Bin's murder.
When Wang Song heard Gao Wenxiang calling Zheng Bin, he immediately looked up: "Old Gao? What's wrong?" Yesterday afternoon, Wang Song waited with hope for Lu Chuan's identification results.
Unfortunately, the comparison failed, and the target person did not leave any fingerprint samples in the fingerprint system.
"Old Wang, come here quickly, let's compare! The fingerprints of Zheng Bin's case are matched!" After two or three breaths, everyone gathered behind Lu Chuan.
Wang Song's eyes almost sunk into the screen.
"Who? Who is it?" Yesterday I didn't win, but today I won!
"There is no information about the other party, but the person who killed Zheng Bin and the murderer of the Qingjian Community fall case five years ago should be the same person." The person who killed Zheng Bin was the murderer of the Qingjian Community fall case five years ago. murderer?
Wang Song's expression changed. He had heard about the case five years ago and knew it was a case handled by the Criminal Investigation Detachment.
"recidivist?"
"Killed the police nine years ago, and killed Qiangjian five years ago?" Sun Hao frowned. He knew both cases.
They all participated in handling the case back then, but obviously, there was no valuable information. Wang Song looked even more gloomy.
Although the fingerprint comparison shows that the murderer in the two cases is the same person, but so what. The murderer killed Zheng Bin in the mountains nine years ago, but the case has not been solved.
Five years ago, a murder occurred in Qingjian Community, but the case was still unsolved. Everyone was talking about the two cases that year.
"Is it possible to re-investigate the case five years ago?"
"This case alone... is unlikely, but if Zheng Bin is added... we can try." The backlog of murder cases will never be abandoned, but the police resources invested are always limited.
Therefore, generally speaking, homicide backlog cases will not reopen investigations without major clues.
Unless the nature of the case changes significantly. A murderer who kills two people is actually not qualified.
There are too many serial murders. And most of them have not been solved, and I have not heard that the investigation of that case has been reopened.
Restarting an investigation is different from follow-up in the general sense. The criteria for restarting an investigation are based on those of a new case.
"Let's apply first. It's unlikely to restart, but...it should be fine for two days." Lu Chuan checked the information and found that Ren Qiang was responsible for the falling case five years ago.
While taking advantage of his break, Lu Chuan called Ren Qiang.
"Is the murderer of the case five years ago and the Zheng Bin case nine years ago the same person?" Ren Qiang was a little shocked. Of the two cases, he was the one responsible for arresting the former, and the victim of the latter, Zheng Bin, was a police officer who joined him in the same class, and they had a good relationship.
"There are no further clues yet." Although Lu Chuan had found something, it was not very useful for catching the suspect.
"My fingerprint battle will be over in five days. I'll go back and look at the files then." After hanging up the phone, Ren Qiang sighed deeply.
Looking back on the case five years ago, it seems like it happened yesterday. And Zheng Bin, Zheng Bin was about to become a father at that time.
After sorting out his mood, Ren Qiang went to the archives room and found the files and physical evidence files on the falling case five years ago.
Unlike Zheng Bin who was murdered in the wild, the case of falling from a building has actually made great progress. The range of suspects targeted is relatively small.
After all, there were only so many people in the building when he fell. It is not difficult to screen everyone.
Even the fingerprints and DNA information of people in the entire street and more than a dozen nearby communities were collected at that time.
Unfortunately, the fingerprint comparison was unsuccessful. In terms of DNA information, there is no obvious progress.
However, based on the time when the crime was reported, it can be determined that the murderer should have been nearby at the time, or even in the building without coming out.
Who on earth is it?
