Although the content of the discussion was serious, the style of the meeting was actually quite relaxed.

All the criminal police officers who participated in the analysis meeting can put forward their own suggestions or guesses.

Of course, there must be some basis for making a guess.

The basis for this is not necessarily evidence, as long as it is reasoning that conforms to general logic.

At homicide case analysis meetings, the forensic doctor is often the first to speak.

But this time, because there was only a human skin, it was impossible for the medical examiner to do an autopsy.

Naturally, there is no post-mortem report.

There won't be a lot of content to be reported.

What's more, Wang Changjiang hasn't come back from vacation yet, and there is only Shen Yan on the forensic side.

Looking at the little girl beside him, Liu Guodong coughed twice and cleared his throat: "I'll say a few words first." ”

All eyes were on Liu Guodong.

"On the current survey, a preliminary survey of the painting has been carried out, and some fingerprint information has been extracted on the frame, and Lao Bai and Yang Sen are comparing it."

"There is also DNA information in human skin, which we have extracted, but there is no successful comparison in the system."

Qin Yong nodded.

Compared with fingerprint comparison, or even footprint comparison, blind DNA information comparison has a very low probability of success.

Unless there is a target person.

Just like Lu Chuan, they did a paternity test.

Otherwise, with the amount of information of less than 5,000 people in the DNA information database of the Haizhou City Criminal Investigation Detachment, if you want to succeed in the comparison, you really have to burn incense and worship the Buddha.

And in any homicide, the identification of the deceased is the most important prerequisite.

Liu Guodong continued to report: "At this stage, we have completed the collection of fingerprint information on oil paints, and Lu Chuan is now processing the skin. ”

"What about Xiao Shen's side, from the perspective of forensic medicine, what did you find?"

Shen Yan participated in the case analysis meeting for the first time, and her nervous hands and palms were already sweaty: "The skin has been soaked in formalin, and it is difficult to accurately determine the time of death of the deceased." ”

"But judging from the DNA information that can still be extracted, the time of death should not be more than a month."

This is a guess range of the time of death that Shen Yan called Wang Changjiang to confirm.

This is because the skin soaked in formalin will lose its activity for a month at most, and it is difficult to extract DNA information.

The skin cells are basically completely saturated with preservatives.

Ordinary extraction methods simply don't work.

Of course, this does not mean that there is no way to extract DNA information, but it requires some special processing.

There is really not much effective information that can be obtained from a human skin.

Qin Yong turned his gaze to Sun Jun and Ren Qiang.

"The painter whose name is marked on the oil painting is Liang Song, a local grassroots painter in Haizhou City, and he has made preliminary inquiries."

Sun Jun began to report on Liang Song's inquiry.

"He did not admit that he painted the painting, and judging from the questioning process, he should not have lied."

Ren Qiang's second action team is responsible for the investigation and questioning of the staff in the exhibition hall: "I don't get much effective information here. ”

"The exhibition hall was set up on Thursday, and the painting was transported directly from Liang Song's studio by a porter."

"My people are checking the video surveillance of the day, and there is no possibility that the oil painting has been transferred."

"As for being transferred in the exhibition hall......"

Ren Qiang said some of his guesses: "The possibility is relatively small, there is monitoring in the exhibition hall, although there is no direct monitoring of the paintings involved, but it is very difficult to transfer nearly one square meter of oil paintings." ”

Being able to put down a human skin, the painting is certainly not small.

"What do other people think?"

Qin Yong looked around again, and everyone knew that at this time, as long as everyone had reasonable speculation, they could speak freely.

Zhang Hui looked around and spoke first: "I think the focus of the investigation should be on this grassroots painter Liang Cong. ”

"He said he hadn't painted the painting, so how did he explain that it was in his studio?"

"Also, the porter at the exhibition hall went to transport the paintings on Thursday, and he didn't even look at them?"

"So you gave a painting that you didn't draw yourself to the porter?"

"There must be something wrong with this Liang Song, these things can't be justified at all."

Zhang Hui's speculation has been recognized by many people.

Qin Yong's gaze looked at Sun Jun.

Liang Song was tried by him, and since he said just now that Liang Song did not lie, then there should be a logical explanation for these questions.

Sun Jun nodded: "I'll talk about Liang Song's situation." ”

"First, the literary and artistic exhibition invited him to participate in the exhibition, and sent him an official invitation letter."

And Liang Song also replied to the invitation, making it clear that the painting he wanted to exhibit was called the dry well next to the wheat field.

"This has been verified by the reply letter received by the exhibition hall."

"What about time? When did he send a reply? ”

"The beginning of August, August 2nd to be exact."

Sun Jun's group has obviously done a lot of work, and on the screen in the conference room, a photo of the reply letter is displayed: "Liang Song was a painting that was determined to be exhibited two months ago, and the forensic doctor just concluded that the owner of the human skin died no more than a month ago." ”

"Second, in Liang Song's studio, in addition to his paintings, there are also paintings by his students."

"I have already sent someone to see the scene, and his studio is renovated in a warehouse in the southern suburbs, with a large area, and there are more than 200 oil paintings in it."

"Among them, there are only 56 paintings that are really painted by Liang Song."

"Third, Liang Song was not present when the studio moved the paintings in question last Thursday, he was in the suburbs at the time, and there were two students who could testify."

"Fourth, when the porter carried the painting, the painting had already been packed, and I touched Lao Ren, and the porter at that time did not check the name of the painting, and they were not obliged to check."

"They just went to carry it, and they didn't know if they were giving it a girl in the wheat wave or a dry well next to the wheat field."

"What about surveillance?"

Qin Yong frowned: "Is there any monitoring in the studio, can you find out who got the packaging?" ”

Sun Jun shook his head: "There is no monitoring, we are now investigating Liang Song's students." ”

When Liu Guodong's people held a case analysis meeting, Lu Chuan's work also entered the most difficult link.

Fingerprinting on the skin.

Unlike the fingerprints collected on the paper that Lu Chuan did before, and the fingerprints collected on the frame just now, the fingerprints on the skin are extracted in reverse thinking.

Since the skin itself has sweat glands and sebaceous glands, it is very difficult to collect fingerprints on living skin.

Because the substance of the skin surface of the living body itself assimilates the fingerprints that cover it.

The inactive skin, which is what Lu Chuan is experiencing now, will be simpler in comparison.

When the killer soaked the skin with formalin, as the preservative soaked the cells, it also fixed the fingerprint chemicals left on the skin by the killer.

Of course, if the other party was wearing gloves at the time, that's another story.

Lu Chuan has already started to do it.