This plum tree has been spotted by anyone passing by the site.
But no one expected that the suspect would leave traces on the tree.
Of course, it is not possible to determine whether this blood stain was left by the suspect, but we will know after checking all the criminal police officers who passed the scene of the crime later, as long as no one has any damage on their bodies. The skin is not left by the criminal police investigating the case.
“Have you done a DNA test?”
Lu Chuan nodded: “Currently, I only did blood type analysis and DNA information testing. The results will not be available until tomorrow morning.”
I just got the things back last night, so the relevant test results didn't come out that quickly.
What's more, this is a blood stain on the leaf, and the blood content is very small.
Lu Chuan personally tested the blood stains on the edges of the leaves.
Just the blood type test took a while.
The corresponding extraction work is still in progress.
"Are you sure you can extract it?"
Li Donglin is a technical criminal police officer, and he is very clear and understanding of the identification of trace evidence analysis.
Not all Weiliang physical evidence can be analyzed accurately and completely.
Because trace amounts of physical evidence are called trace amounts, they are very small. Even if high-precision instruments are used, in many cases the results desired by the police cannot be obtained.
Lu Chuan cannot guarantee this: "The technical team is currently testing this blood. It is not yet certain whether the DNA can be verified."
"You should know tomorrow morning."
Li Donglin nodded: "Okay, you continue."
Lu Chuan continued to report.
“Judging from the handling of the crime scene, the criminal suspect was very cautious and carefully eliminated all traces of his past.”
This point is made by the CZ City Criminal Investigation Detachment. The people nearby knew this very well. When they investigated the scene, they did not collect any valuable physical evidence.
Not to mention finding any pointing clues.
Lu Chuan flipped the ppt and what appeared on it was a photo next to the stove.
“These are some photos I took again when I went to the scene yesterday with Comrade Zhao Zhigao, director of the Tianzhou Criminal Investigation Detachment Investigation Office.”
Zhao Zhigao knew that what Lu Chuan was going to explain now was Judgment about the suspect's height.
“After killing Wang Jingya, the criminal suspect put it directly into the iron pot for steaming. The other party should have been sitting on this stool at the time, and then added firewood to the stove.”
< br>
"This involves the question of whether the other party is comfortable adding firewood..."
Next, Lu Chuan re-explained the explanation to Zhao Zhigao and performed some calculations on the whiteboard.
“From the distance between the stove, bench and firewood pile at the scene, it can be basically deduced that the height of the suspect should be between 1.6 meters and 1.7 meters.”
For Lu Chuan's judgment...
Most people present agreed, especially those who had lived in rural areas and had this kind of life experience.
Because the entire process of cooking corpses cannot be completed in a short time, it will take half an hour to an hour, or even longer. "Based on the forensic examination of the scene and the degree to which the body was cooked at the time, the suspect burned a large amount of firewood at the scene, and the duration should have lasted for two to three hours or even longer."
The parts of the corpse have been cooked until they have been removed from the bones. Of course, this time will not be short.
Wang Jingya disappeared at around nine o'clock the night before, and was discovered at dusk on the second day.
It is very likely that after the suspect brought the other party to Xijiagou Village, he disposed of the body for a long time.
"Although this method of adding money to firewood is related to people's habits, over a long period of time, I personally think that the other party should choose a theoretically more comfortable position to do it."
Lu Chuan then proposed what he discovered Some clues.
"In addition, I personally think that the suspect is likely to have experience in rural life."
Lu Chuan flipped the PPT and another photo appeared.
“This is the wing on the west side of the discovery site. The firewood is piled in this pile. I conducted a careful investigation and found some fibers that are the same as those on the plum tree.”
"Not only that, the firewood inside has obvious signs of being turned over."
"In other words, the murderer took the firewood from this wing. If he does not have ordinary life experience, it is unlikely that he would know about firewood. Where or how to get some firewood?"
"So, when investigating the situation of the criminal suspect, can this be taken into consideration?"
After Lu Chuan finished speaking, he continued. Introducing his biggest discovery.
The projection flipped, and what appeared was an extremely damaged fingerprint.
"Fingerprints?"
Although the fingerprints are very fragmented and can't even see their original appearance, the people here are all detectives and they can tell what they are at a glance.
Li Donglin was also very surprised.
Lu Chuan has been busy since he entered the scene yesterday and inspected the body. Before introducing it to him, he first looked at the clues found here. The other party actually found a fingerprint at the scene!
“Did you find it at the scene?”
Lu Chuan nodded.
“I found this broken fingerprint on a piece of firewood on the firewood pile left at the scene.”
Lu Chuan enlarged the fingerprint: “The other party must have been with me during the process of adding firewood. These firewoods had come into contact. Although most of the firewood was thrown into the stove pit and burned after he came into contact with it, the firewood in these firewood piles was mixed together and it was impossible for the other party to throw them all in at once, so he needed to do something Necessary separation."
The projection changes again, and a picture of a branch appears: "It was on this branch that the fingerprint was found."
"It's just the branch itself. The fingerprint collected with an irregular shape was severely damaged, and I only extracted one feature point on it.”
"After I came back last night to identify and process this fingerprint, I used the system to conduct comparison and analysis, but I still couldn't find the target fingerprint after taking hundreds of fingerprints."
"However," Lu Chuan continued. Said, "Everyone knows that any fingerprint is specific, and any characteristic point in any fingerprint is actually specific."
"Although this fingerprint cannot be stored in the system, The target person is found through comparison, but if during the investigation, there is suspicion of a criminal, collect the fingerprints and I will conduct a manual comparison."
"As long as the fingerprint is that of a criminal suspect. If you stay, the other party will never be able to escape."
Lu Chuan's words cheered everyone up. (End of chapter)