Chapter 1047: Competing

Chapter 1047: Competing

"This should be the area where Xu Li may have come into contact. Area No. 2." Deputy Captain Qi Yongmiao pointed out the designated area to Jiang Yuan with a little nervousness.

Jiang Yuan had previously obtained the fingerprint of the middle finger of the corpse No. 1 by frying it. Now, if the same fingerprint can be obtained from a certain area in the supermarket, it can be proved with certainty that Xu Li is the deceased.

A more certain way is to obtain the same DNA, because although the body No. 1 is highly decomposed, DNA can still be obtained. But because Xu Li is an orphan and the single room in the rented house has been rented to other residents, although the surveyors also tried to extract DNA, this kind of comparison is actually more troublesome.

In contrast, as a stock clerk, Xu Li is very likely to leave fingerprints in the supermarket.

While waiting for Jiang Yuan, Wu Junhao and others have roughly demarcated the areas that Xu Li may have come into contact with through the surveillance in the store. However, the same fingerprint was not obtained in the designated area No. 1.

Qi Yongmiao held his breath at that time.

If Jiang Yuan hadn't taken the fingerprints himself, Qi Yongmiao would have asked someone to take them again.

Jiang Yuan still looked calm. He also took this matter seriously, so he came here specially to take fingerprints himself. Liu Jinghui and others who were traveling with him were observing this small supermarket. They had already taken Xu Li as the victim and began to think.

Area No. 2 is a shelf in the warehouse, which is located at the back. From the surveillance, although someone behind Xu Li had touched this place, the frequency was not high and the number of times was not large. The key point was that there was no wiping behavior, which was more conducive to preserving fingerprints.

Jiang Yuan took a gray mouse hair brush, chose silver powder as fingerprint powder, and then brushed it finely on the shelf with a black background, and the fingerprints in pieces appeared instantly.

Jiang Yuan looked at these fingerprints carefully again and only chose the fingerprint of the middle finger to extract.

It was useless to extract other things. The corpse No. 1 only took out the fingerprint of the middle finger of the right hand.

The area just collected failed to find a suitable fingerprint. Jiang Yuan guessed that Xu Li did not leave the fingerprint of the middle finger of his right hand in the area, or left it and was accidentally wiped. Therefore, although he didn't match, he was not too anxious.

Those who do fingerprints have too many similar experiences - confident fingerprints that didn't match can be said to be a situation that every trace examiner has experienced. After doing similar work for a few years, the mentality will be more stable. Or more broken.

From another perspective, the suspects or victims that criminal police confidently confirm may not really be suspects or victims. Fingerprint and DNA technology have not only caught many criminals, but also saved many innocent people.

Many times, coincidences and things that don't conform to reasoning will happen in the world. This situation is not common, but once it happens, it is often only the purest technology that can pull it out of the quagmire.

Jiang Yuan now wants to use technology to confirm that Xu Li is the number one victim. Although it is said that everyone, including Jiang Yuan himself, is basically sure that Xu Li is the victim, there is still a gap between certainty and evidence.

There should be such a gap.

Jiang Yuan collected fingerprints on the scene, collected one, and compared one.

This type of comparison does not require the participation of computer software, and is more like the early fingerprint comparison mode. It is a one-to-one comparison of the similarities and differences between two fingerprints. It is equivalent to the final confirmation step after the software has produced a candidate fingerprint.

Jiang Yuan does not need to mark the feature points. The fingerprint of the original corpse has long been recorded by him. Now he just needs to see whether the newly taken fingerprint is consistent.

In this way, the progress of the comparison is also very fast. After taking six or seven fingerprints, one fingerprint was left by Jiang Yuan.

This fingerprint looks slightly different from the fingerprint of the original corpse at first glance, but those who are familiar with fingerprints know that the fingerprints left on objects are not immutable.

Because the pressure when the finger contacts the object is different, the fingerprint, that is, the pattern on the finger, will be scattered due to high pressure, concentrated due to low pressure, and the fingerprint left is actually a one-sided fingerprint due to different deflection angles of the contact surface.

If there is a living person present, roll out a full fingerprint, which is easier to compare. Now that the person is dead, it is equivalent to comparing two one-sided fingerprints. If there is no omission, it is almost necessary to have a fingerprint level of LV2.

Jiang Yuan was naturally fully covered.

The LV6 fingerprint analysis method, when used in such a place, is like a guard who has worked for a year and sees his young wife when he returns home.

Jiang Yuan spent a little longer time studying the fingerprint in front of him, but it was just to confirm.

A few minutes later, Jiang Yuan straightened up, did not take more fingerprints, nodded and said: "It is confirmed to be the same, it is indeed Xu Li's fingerprint."

All the police officers present were excited.

This is not only a matter of confirming the identity of the first victim, but also a huge breakthrough in the case.

Liu Jinghui immediately said: "I will contact the technical investigation first to see if I can find some clues from the mobile phone number."

Since the murderer sent messages with Xu Li's mobile phone after his death, it means that the murderer was exposed at the time.

And many of the techniques of technical investigation are very difficult to prevent in daily life.

Even if the murderer knows how to prevent it, he has to pay a price, or in other words, in order to prevent these things, the murderer needs to make certain compromises, and his actions may be deformed.

Liu Jinghui didn't need to consider the possibilities. Anyway, he would investigate first.

Jiang Yuan naturally agreed.

The murderer borrowed the deceased Xu Li's mobile phone to send messages, which in itself is a very important clue.

Liu Jinghui arranged for people to collect surveillance videos of nearby shops and properties, then pulled Jiang Yuan to the side and whispered: "The murderer must have planned this murder carefully. Xu Li took the salary He disappeared the next day, so it’s hard to say it was an isolated incident, but the murderer was exposed.”

"What do you mean?"

"The murderer is probably an acquaintance of Xu Li, who at least has channels to know him. Therefore, murdering Xu Li is not a random killing." Liu Jinghui breathed a sigh of relief, and then said with bright eyes: "He thought this could reduce the risk of being discovered. possibility, but it also strengthens the connection with the victim.”

"Xu Li is an orphan." Jiang Yuan said the known situation here, and then slowly said: "He is a supermarket tallyman, and he should not have too many people in daily contact."

"Considering from the murderer's point of view, orphans may also be necessary." Liu Jinghui's thinking became clearer and clearer, saying: "The murderer seems to have killed three people in a row, but his plan may have been planned long ago. He is doing it. If he wants to kill consecutively, he needs the first person. The later the second person is discovered, the better. From his planning, if the victim has a family member, once the crime is reported, Xu Li will enter. The probability of being discovered by us is much higher in the missing population database.”

Jiang Yuan nodded noncommittally.

Liu Jinghui continued: "Similarly from the perspective of the murderer, he knew so much about Xu Li that he would not be someone Xu Li was too familiar with, otherwise it would be too easy to be investigated. Therefore, the murderer is probably not a person with strong connections to Xu Li ”

Jiang Yuan nodded and said: "We met by chance, and we know a little bit about him."

"Especially knowing the time when his salary is paid." Liu Jinghui licked his lips and whispered: "This means that the murderer may have communicated with Xu Li in the past two months, either online or offline."

"kindness."

"Then I have an idea."

"oh?"

Liu Jinghui said: "Xu Li is a supermarket tally clerk. I think the number of people he can come into contact with must be limited, and it will take some time to get to know him. I think we can do a screening and select all people who are in the same place as Xu Li at the same time. If the cell phone in a location lasts for more than 3 minutes, it will be included as a suspect and we will see how many suspects we can come up with.”