Chapter 882

All four corpses were exposed outdoors, so traces of varying depths were left around the crime scene. Among them were the suspect's, and the murderer's. Theoretically, there were also traces left during the process of rape and even necrophilia.

However, because the corpse rotted, and the local vegetation grew abnormally fast, and there were often heavy rains and exposure to the sun, these traces were interfered with to a greater extent.

Looking at the footprints collected from the four cases alone, it can be roughly judged that only the murderer and the victim were at the crime scene. But if one wants to get more case clues through forward analysis, it is extremely difficult.

However, conversely, having a certain analytical conclusion and using these traces to make arguments is enough.

And Jiang Yuan watched the autopsy videos of the three corpses before, and also gave a positive answer to the second and third corpses: "These two corpses also have traces of necrophilia."

"Is it only the first corpse that was not necrophilia?" Nicha pondered for a while and said: "Was it that there was no such strong demand during the first time? Or did he not know he had this demand? Or is the psychology gradually becoming perverted?"

Dama was a former British colony. The police's mode from configuration to training to case-breaking was all copied from the British and then localized. Therefore, facing serial killers, Nicha's first reaction was to engage in criminal psychological analysis.

Jiang Yuan didn't have the idea of thinking about the murderer's psychology by putting himself in his shoes, just raised his head and said: "The first corpse rotted more severely, it's not very certain whether it was necrophilia. In addition, it is also possible that necrophilia was not successful. In that case, it wouldn't be reflected on the corpse."

Nicha suddenly realized: "Right, it might be the first necrophilia, not very skilled yet, maybe couldn't get in."

"It is also possible that he was too excited and leaked prematurely outdoors. After wiping it, and putting it outdoors for two days, the external organization can't see it either." Jacob put forward another point of view.

Nicha, Jiang Yuan, and others all looked at Jacob with suspicious expressions, and Zhong Renlong's translation paused twice before continuing. Immediately after, the comrades from Ningtai also looked at Jacob with "suspicious eyes."

Jacob hurriedly said: "Rapists often have problems with premature ejaculation and impotence. It's not strange to be too excited and leak prematurely."

"Thinking it's too exciting for the first necrophilia, this thing is very strange." Nicha made a joke, then nodded, and said: "But there is indeed such a possibility. Mm... if calculated this way, the murderer's residence or workplace should be at the intersection of the four crime scenes?"

Zhong Renlong added: "This direction, we have already investigated."

The two said the standard police investigation mode, drawing a circle with the crime scene as the center. The intersection of the four large circles of the four cases has a high probability of being the suspect's residence or workplace.

This mode sounds superficial, but it has been verified many times. Because people are simple animals in many cases, especially serial killers who act according to instinct, they should be even more so.

Nicha thought for a moment, then looked at Jiang Yuan, and then asked Zhong Renlong: "Who was sent to investigate at that time?"

Serial rape and murder cases, the Dama police station also invested a lot of police force and investigated multiple directions.

Zhong Renlong checked his mobile phone and said: "The third group did the investigation. They investigated companies within the scope, retrieved the information of local apartment building owners and tenants, and also investigated local hotel accommodation, etc."

"If it's just like this, that's not enough. At least you have to ask every household and investigate." Jiang Yuan just crawled out of the mud pit in Meiyang City. As soon as he heard it, he knew that they didn't reach the standard of investigation, and at most it could only be considered as a visit level.

But for this kind of case, you send a dozen or twenty people to visit, hoping to find the person who is not the masses from the masses, the difficulty is too high, and it is also a bit of luck.

Zhong Renlong smiled bitterly: "Without a search warrant, many people are unwilling to cooperate."

Jiang Yuan had experienced similar situations in Dama before, so he nodded without surprise, pondered for a moment, and said: "From the current situation, the intensity of the search is definitely not enough. However, we can look at other evidence first..."

Several people ended the autopsy, washed themselves clean in the bathroom, changed clothes again, and went to the office upstairs together to read other materials.

Footprints, fingerprints, previous investigation reports, etc., the police had already organized them, and Jiang Yuan read them one by one, and by the way, made a comparison of some main fingerprints.

Not much gained.

Although Jiang Yuan spent only a few hours on the investigation, the investigation to this step is about the end.

After marking several fragmented fingerprints and comparing them without results, Jiang Yuan decisively said: "Next, I suggest taking the intersection point around the crime scene as the investigation focus."

"Around the Anlai area? Although the designated scope is not large, but... should we strictly execute according to the designated scope? If it exceeds the scope of a few hundred meters, the scope of the investigation will increase a lot." Zhong Renlong raised a realistic problem.

For relatively prosperous streets, if the investigation radius increases by 100 meters, the list of people to investigate might increase by tens of thousands, which is no small challenge for the police force of any city.

Then, what if the radius doesn't increase? Just strictly designate the scope according to the results of the paper drawing?

In terms of normal thinking, anyone doing things always has some floating. Serial killers doing things, it is estimated that they are not so accurate and uniform. Then how much is appropriate to increase the radius?

Jiang Yuan had done many fields with Xu Taining. At this time, he didn't talk so much, and just followed the method learned from Xu Taining clearly and clearly, saying: "Just strictly execute according to the designated scope, no need to exceed the scope. If you can't find it, we will expand it. But within the designated scope, it must be carefully investigated. Can this be done?"

This is Xu Taining's idea, but if you want to investigate, you must investigate thoroughly. For example, the investigation done by Nicha and others before was not thorough, so now they have to consider the problem of secondary investigation.

Nicha and others looked at each other, all a bit hesitant, discussed in a low voice, and said: "God Jiang, although we also want to investigate every household, it is indeed difficult to do. And, if our investigation target is to extract fingerprints and DNA, I am afraid it is even more difficult."

Jiang Yuan was stunned for a moment. If Xu Taining came, he could only buy a return ticket.

Zhong Renlong also said in a low voice: "God, the intensity of our previous investigation has reached the limit. If we want to increase the scope and depth of the investigation, I am afraid we need some support of evidence, and perhaps we need court subpoenas and the help of lawyers."

This sentence, Zhong Renlong said in Chinese first, and then said it again in Malay.

Miao Ruixiang clicked his tongue: "Dama belongs to increasing the difficulty. Rapists have to fire another shot."

Zhong Renlong translated again, Miao Ruixiang hurriedly said: "I'm just complaining, no need to translate."

Jiang Yuan waved his hand when he heard this, and said: "If the intensity of normal investigation has reached the limit, then let's do this first, let's think of other ways."

This is actually a part of Xu Taining's investigation method. Thorough investigation is essentially a comparative level. More thorough is thorough, which is also unclear.

Therefore, since Nicha and Zhong Renlong both think that the local investigation has reached the end, then the clue of simple investigation is exhausted. For the police, there is nothing incomprehensible about this. There are many places in the country that will not let you investigate to your heart's content, or rather, before the popularization of DNA technology, no matter how thorough you investigate, it may not be thorough enough. Coordinate White Silver Case.

"Actually, the scope that needs to be investigated is not particularly large. I provide an idea. The footprints left by the suspect are very complete. You can judge the gait through the footprints. If you can collect the gait data of these people within the investigation scope, such as videos of entering and leaving, I can also make a judgment directly."

The plan given by Jiang Yuan is equivalent to being a human gait analyzer—the cameras at airports and high-speed railway stations in the country have already been able to analyze and match independently. Dama does not have such a system, nor does it have a corresponding database, so Jiang Yuan went directly to the field.

Nicha and Zhong Renlong were very different. This is not the same as the performance when Jiang Yuan was on TV before. This is a matter of two orders of magnitude.

On TV, Jiang Yuan might only need to look at two-digit footprints and footprints, and if he wants to analyze the gait of people in an area by watching videos, it is more than ten thousand people.

"Is it really possible? Will it be too hard?" Nicha put away his shock and changed to admiration and a trace of embarrassment.

"The clue is stuck here, and there is nothing hard or not hard. I can watch three or five hundred sets of gait in an hour, and footprints can only watch one or two hundred. You try to collect the videos as completely as possible." Jiang Yuan didn't just say it casually. It has long been known that breaking cases by purely watching videos in the country, and there are even organizations of thousands of police officers watching videos.

However, watching gait is much easier than other ways, but the technical requirements are high.

Jiang Yuan said here, looked at the time, and said: "Let's do this today, I will go to sleep early, and I will trouble you next. I will officially start watching the video tomorrow afternoon."

This period of time is for Nicha and others to collect videos, analyze videos, and even edit videos.

Nicha and others fully understood, hurriedly thanked, and respectfully sent Jiang Yuan and others to the car.

According to Huang Qiangmin's request, the hotel booked by the Dama police was also quite good. Jiang Yuan lived in a suite, took a shower again, and went to sleep.

Because Miao Ruixiang was Jiang Yuan's junior brother, he got a separate large bed room not far away. Miao Ruixiang also took a shower, changed clothes, and then took a red cloth-wrapped statue out of his suitcase.

Miao Ruixiang respectfully offered the red cloth statue on the table, lit three sticks of incense, then uncovered the red cloth, and a wooden carved Jigong Bodhisattva appeared in the curling blue smoke.

Miao Ruixiang bowed, then took out his mobile phone face-to-face, and dialed a video call to his master Wu Jun.