Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 63 Liang Song's Suspect

Although the content of the case analysis meeting of the Criminal Investigation Detachment was serious, the style of the meeting was actually quite relaxed.

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

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

The basis mentioned here is not necessarily evidence, as long as it is in line with general logical reasoning.

In homicide case analysis meetings, forensic doctors are often the first to speak.

But this time, because there was only one piece of human skin, it was impossible for the forensic doctor to do an autopsy.

Naturally there is no autopsy report.

The content of the report will not be much.

What's more, Wang Changjiang hasn't rushed back from his vacation, and Shen Yan is the only one with the forensic doctor.

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

All eyes were on Liu Guodong.

"Currently surveying the painting, we have conducted a preliminary survey of the painting and extracted some fingerprint information on the frame. Lao Bai and Yang Sen are comparing it."

"There is also the DNA information in the human skin. We have already extracted it, but it has not been successfully compared in the system."

Qin Yong nodded.

Compared with fingerprint comparison, or even footprint comparison, the probability of success in blind DNA information comparison is extremely low.

Unless there is a target person.

Just like the paternity test that Lu Chuan and the others did.

Otherwise, with the current amount of information in the DNA database of the Haizhou Criminal Investigation Detachment of less than 5000 people, if you want to make a successful comparison, you really have to burn incense and worship Buddha.

In any murder case, the determination of the identity of the deceased is the most important prerequisite.

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

"As for Xiao Shen, from the perspective of forensic medicine, what findings have you found?"

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

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

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

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

Skin cells are essentially completely saturated with preservatives.

Ordinary extraction methods simply cannot work.

Of course, it doesn't mean that there is no way to extract DNA information, but some special processing is required.

It is true that there is not much effective information that can be obtained from a piece of human skin.

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

"The painter whose name is marked on the oil painting is Liang Song. He is a local grassroots painter in Haizhou City. He has already made a preliminary inquiry."

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

"He didn't admit that he painted the painting. Judging from the interrogation process, he shouldn't have lied."

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

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

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

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

Ren Qiang said some of his guesses: "The possibility is relatively small. There are surveillance cameras in the exhibition hall. Although there is no surveillance directly on the paintings involved in the case, it is very difficult to recontract an oil painting of nearly one square meter."

A piece of human skin can be put down, and the painting is certainly not small.

"What do other people think?"

Qin Yong looked around again, and everyone knew that as long as everyone had a reasonable guess at this time, 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 Song."

"He said he had never painted the painting, so how did he explain that the painting appeared in his studio?"

"Also, the porter in the exhibition hall went to transport the oil painting on Thursday, and he didn't even take a look at it?"

"You just handed over a painting that you didn't draw yourself to the porter?"

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

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

Qin Yong looked at Sun Jun.

Liang Song was interrogated by him. Since he said that Liang Song was not lying, there should be logical explanations for these questions.

Sun Jun nodded: "Let me tell you about Liang Song's situation."

"First, the art exhibition invited him to participate in the exhibition, which is to send him a formal invitation letter."

"And Liang Song also replied to the invitation letter, specifying that the painting he wants to exhibit is called Dry Well Next to the Wheat Field."

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

"What about the time? When did he reply?"

"Early August, August [-]nd to be exact."

Sun Jun and his group have obviously done a lot of work. On the projection screen in the meeting room, the photo of the reply letter is displayed: "Liang Song was confirmed to participate in the exhibition two months ago, and the conclusion of the forensic doctor just now is that human The time of death of the hide owner was not more than one month."

"Secondly, in Liang Song's studio, besides his paintings, there are also those of his students."

"I have sent someone to visit the scene. His studio was remodeled in a warehouse in the southern suburbs. It has a large area and contains more than 200 oil paintings."

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

"Thirdly, Liang Song was not present when the studio moved out the paintings involved in the case last Thursday. He was collecting scenery in the suburbs at that time. Two students can testify."

"Fourth, when the porter moved the painting, the painting had already been packed. I touched the old man. The porter at that time did not check the title of the painting, and they were not obliged to check."

"They were just carrying it. As for whether it was the girl in the wheat wave or the dry well next to the wheat field, they didn't know at all."

"What about monitoring?"

Qin Yong frowned: "Is there any surveillance in the studio, can you find out who made the packaging?"

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

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

Fingerprint collection on the skin.

Different from collecting fingerprints on paper that Lu Chuan made before, and collecting fingerprints on picture frames just now, the fingerprint extraction on skin adopts 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 on the surface of the living skin will assimilate the fingerprints covered on it.

The deactivated skin, which is the situation Lu Chuan is now encountering, will be simpler in comparison.

When the killer soaked the skin in formalin, as the preservative saturates the cells, it also immobilizes the fingerprint chemicals the killer left on the skin.

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

Lu Chuan has already started to do it.

(End of this chapter)