civil forensic

"I also want to look at the evidence again, let's read the papers first."

Jiang Yuan didn't speak directly because of everyone's request. The backlog 11 years ago is a real old backlog, and the work of grading papers alone is quite heavy.

Now, since there is already a formal backlog case class and a team of no.

The first step in restarting the backlog is to sort out and sort out the clues.

The clues from the past must be brought out, and if there is evidence that can be inspected non-destructively, it must be re-examined to see if the latest technological innovation can play a role.It is also necessary to look at the evidence of the year to see if there are any mistakes, omissions and imperfections.

And the information that the police have been searching for before has to be seen by someone.Hundreds of thousands of pages of interrogation transcripts need to be read by someone. It would be even better if clues or some evidence can be found from them.

"If the murder case is not solved and the special case is not withdrawn", it is still a gimmick to a large extent. However, it is indeed very necessary and even a smart move for the special case team to retain one or two policemen who can know the whole process.

On the "Accumulated Cases Special Team", the two policemen of the special case team contacted, the older one has retired, and the younger one... is still an ordinary policeman from the criminal police detachment, so they can keep up with the progress by pulling them over on the spot.

When everyone was busy, Liu Jinghui sat next to Jiang Yuan and said in a low voice, "You feel it too?"

"Feel... what?" Jiang Yuan looked blank.

"This case is different." Liu Jinghui looked serious.

Jiang Yuan's expression suddenly became serious: "You mean, it's possible..."

Jiang Yuan pointed his hand upwards, his eyes full of interrogative sentences.

Liu Jinghui froze, stretched out his hand and broke Jiang Yuan's fingers, and said, "I mean, this may be a pair of male and female thieves. Well, it's not accurate to say that the thieves are the suspects should be a pair of men and women. .”

"Huh, why?"

"Because there is no ***." Liu Jinghui's voice was low.

Seeing that Jiang Yuan was still puzzled, Liu Jinghui coughed twice, and said: "This... I have done several robbery and murder cases in taxis, and I have also studied some cases inside and outside the province. Let's put it this way, if the taxi The driver is a female driver, and she drove to the wilderness, if there is robbery or murder in the end, most of them will involve rape."

"Many, not all."

"If there is no rape involved, either the female driver is too old, or there are women in the gang, and the rest, many of them will evolve into robbery and murder." Liu Jinghui sighed: "So, this case There were obvious omissions during the on-site investigation.”

This is why Liu Jinghui gave this case a high score.

Jiang Yuan listened quietly to the explanation.

"I looked at the photos in the file. There was a long hair in the back seat of the car, but I found the evidence bag, but I didn't take a sample at the time. I guess the criminal police who inspected the scene thought it was the victim's hair. Looking at it It does, but I think it's more likely the murderer's hair."

As Liu Jinghui said, he found the photo from the file.

In the crevice of the brown seat, there was a mass of blood. The photographer wanted to photograph the blood, but a long hair could be vaguely seen beside it. …

Jiang Yuan immediately took the victim's photo and compared it. After repeated judgments, he nodded slowly: "It is possible that the hair is a bit similar to the victim's. The length and color are similar, but the curl is slightly different. The condition of the photo is too bad. , can’t be sure, but even if it wasn’t the victim’s hair, it might have been left behind by previous guests.”

Regarding the taxi case, the annoying thing is here. The vehicle seems to be a treasure trove of evidence. When it is opened, the ownership of every treasure is questionable.

In the process of extracting evidence, how to extract evidence and what evidence to extract is itself a place to test the current survey.

First of all, it is necessary to make it clear that it is impossible to provide unlimited evidence in current surveys.

A few dollars for a physical evidence bag is not a big deal. DNA reagents are indeed not cheap. Domestic ones are priced at [-] yuan. Moreover, there are always some imported products that are easier to use than domestic ones. You need higher precision. , better sensitivity always comes at a price.

A murder scene, extracting a dozen
It is normal to have DNA traces in one place, and it is normal to extract hundreds of places, but in such a large scene, it is impossible to extract hundreds of places, and it is actually impossible to cover everything.

And this is not only a problem of expensive consumables, the workload of the laboratory is also limited.A city bureau's dna laboratory processes dna test materials all day long, and the feedback time for ordinary cases is "weekend", "next week" and so on.

Although murder cases are taken seriously, they cannot occupy resources indefinitely.

Xian Kan or other technicians, or other criminal police, always have to make some judgments and trade-offs based on their own experience.

Obviously, judging from the circumstances of the case, the police who were involved in the survey scene at that time probably never thought that there would be women involved in such a fierce robbery and murder case of beheading.Therefore, when the material was collected, this hair was not detected on purpose.

Liu Jinghui said noncommittally: "I guess it's two men and women. Another reason is that there was only one bloody footprint at the scene, and the DNA extracted from the victim's nails has not been matched for many years. This kind of stability, It's also rare, I bet it's a pair of fateful mandarin ducks."

"You think the murderer would have committed another crime?"

"Most murderers in robbery and murder cases are repeat offenders." Liu Jinghui said, "There are only murderers who rob one time. When a hero goes to Liangshan, robbing houses has become a daily business."

Jiang Yuan nodded and said: "This shows that the original purpose of the case is probably not robbery."

"Yes, the purpose should not be robbery, let alone murder." Liu Jinghui paused, and continued: "From the way of killing people, beheading may seem cruel, but it is actually very unprofessional, and it proves the murderer's amateurism from the side. Sex. However, there is something about the murderer's method, I think he should have been exposed to similar jobs, such as a butcher, or a doctor."

"If it's a doctor, shouldn't it be killed and divided?" Jiang Yuanxiao objected.

"It's possible." Liu Jinghui nodded and asked, "What evidence can you see on your side, why do you give it a high score?"

"There was only one bloody footprint at the scene. Male, about 38 years old, 175 cm tall, with a slight lameness on his left leg." Jiang Yuan said emphatically, "The degree of lameness is not too severe. If you wear height-increasing shoes, you won’t be able to see it.”

Liu Jinghui's eyes lit up when he heard this: "No wonder you gave a high score. This case should be ranked first. If you have a lame leg, it will be much easier to find someone."

The recognition of the lame leg is very high. If it is not concealed, people around will notice it when walking.

It's so much easier to tell apart than having two arms that are different lengths, or two eggs that are different sizes, that you don't even need to pay special attention.

"There is also dna, but they didn't check it back then." Jiang Yuan said: "I'm afraid the two of them are no longer in the local area."

"Well...it's very possible. The investigation should have been very detailed back then." Liu Jinghui was a little heavy at this time. If the person left, or he was a foreigner, the investigation would be useless.

If there is no investigation, the combat effectiveness of the criminal police will drop by [-]%.

"A lame butcher? And with dna, it is indeed a breakthrough." Liu Jinghui nodded.After all, it was a backlog of homicide cases, and it was actually not easy to have so many clues.

It's just that compared with the first case, there is no way to make a direct breakthrough in this case.