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

This plum tree has been discovered by everyone who has passed by the site.

But no one expected that the suspect would leave traces on the tree.

Of course, it is still impossible to confirm whether the bloodstain was left by the suspect. However, a check of all the criminal police officers who passed by the crime scene at that time will reveal that as long as there is no broken skin on their bodies, it was not left by the criminal police officers in charge of the case.

“Have you done a DNA test?”

Lu Chuan nodded: "We have only done 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 bloodstain on the leaves, and the blood content is very small.

Lu Chuan personally tested the bloodstains on the edge of the blade.

Just the blood typing test took a while.

The corresponding extraction work is still in progress.

"Are you sure you can extract it?"

Li Donglin was a technical criminal police officer and he has a clear understanding of the analysis of trace evidence.

Not all evidence is amenable to accurate and complete data analysis.

Because trace evidence is called trace, it means it is very small. Even if high-precision instruments are used, it is often impossible to get the results the police want.

Lu Chuan couldn't guarantee this either: "The technical team is currently testing this blood. We are not sure whether DNA can be found."

"We should know tomorrow morning."

Li Donglin nodded: "Okay, you continue."

Lu Chuan continued his report.

"From the handling of the crime scene, it can be seen that the suspect was very cautious and carefully eliminated almost all traces of himself."

The people at the CZ City Criminal Investigation Brigade were well aware of this. When they were investigating the scene, they did not collect any valuable physical evidence.

Not to mention finding any clues that point to the future.

When Lu Chuan flipped the PPT, a photo next to the stove appeared.

"These are some photos I re-took when I went to the scene yesterday with Comrade Zhao Zhigao, Director of the On-site Investigation Office of the Tianzhou City Criminal Investigation Detachment."

Zhao Zhigao knew that what Lu Chuan wanted to explain now was his judgment on the suspect's height.

"After killing Wang Jingya, the suspect put her body directly into the iron pot to cook. He should have been sitting on this stool and adding firewood to the stove."

"This involves the question of whether the other party is comfortable adding firewood..."

Next, Lu Chuan repeated the explanation he had given to Zhao Zhigao and performed some calculations on the whiteboard.

"Based on the distance between the stove bench and the firewood pile at the scene, we can basically infer that the suspect's height should be between 1 and 6 meters."

Regarding Lu Chuan’s judgment…

Most people present still agreed, especially those who had lived in rural areas and had this kind of life experience.

Because the whole process of cooking the corpse is not a short process that can be completed in a short time, it may take half an hour to an hour, or even longer. "Based on the forensic investigation of the scene and the degree to which the corpse was cooked, the suspect burned a large amount of firewood at the scene, which should have lasted for two to three hours or even longer."

The body parts had been cooked to the point of being boneless, so this must have taken a long time.

Wang Jingya disappeared at around nine o'clock the previous evening and was found at dusk the next day.

It is very likely that the suspect took a long time to deal with the body after bringing the victim to Xijiagou Village.

"Although the way of adding firewood depends on people's habits, I personally think that over a long period of time, the other party should choose a posture that is theoretically more comfortable."

Lu Chuan then presented some clues he had discovered.

"In addition, I personally think that the suspect is likely to have experience living in the countryside."

Lu Chuan flipped the PPT and another photo appeared.

"This is the wing on the west side of the discovery site. It's full of firewood. I conducted a careful investigation and found some fibers similar to those on the plum tree."

"Not only that, the firewood inside had obvious signs of being turned over."

"In other words, the murderer took the firewood from this wing. If he didn't have general life experience, it's unlikely that he would know where the firewood is or how to light it."

"So, when investigating the suspect, can you take this into consideration?"

After Lu Chuan finished speaking, he went on to introduce his biggest discovery.

The projection flipped, revealing an extremely damaged fingerprint.

"fingerprint?"

Although the fingerprints were very damaged and their original appearance could not even be seen clearly, everyone present was a criminal police officer and they knew what they were at a glance.

Li Donglin was also very surprised.

Lu Chuan has been busy since he entered the scene yesterday and inspected the body. He has not been introduced yet. Let’s take a look at the clues found here. The other party actually found a fingerprint at the scene!
"You found it at the scene?"

Lu Chuan nodded.

"I found this fragmentary fingerprint on a piece of firewood in the firewood pile left at the scene."

Lu Chuan magnified the fingerprints: "When the other party was adding firewood, he must have come into contact with the firewood. Although most of the firewood was thrown into the stove and burned after he came into contact with it, the firewood in these piles was mixed together. It was impossible for the other party to throw it all in at once, so he needed to do some necessary separation."

The projection changed again, showing a picture of a tree branch: "It was on this branch that the fingerprint was found."

"It's just a branch. The shape is irregular and the fingerprint I collected is severely damaged. I only extracted one feature point on it."

"After I came back last night and processed the fingerprint, I used the system to compare and analyze it, but I couldn't find the target fingerprint after analyzing hundreds of fingerprints."

"However," Lu Chuan continued, "everyone knows that any fingerprint has its own specificity, and any characteristic point in any fingerprint also has its own specificity."

"Although this fingerprint cannot be matched to the target person in the system, if you suspect a criminal during the investigation, please collect the fingerprint and I will manually compare it."

"As long as this fingerprint is left by the suspect, he will definitely not be able to escape."

Lu Chuan's words cheered everyone up. (End of this chapter)