Chapter 344 Small Dose

, the latest chapter is updated the fastest!

Jiang Yuan spread some photos on the table and looked at them in deep thought.

This is his usual operation. Many of his cases started from photos.

Other policemen in the room either looked at the photos, did their own things, or played with their phones to take a break.

Song Jinyou noticed Jiang Yuan's expression and stood in front of him to look.

They were all photos he had seen before, and some were even taken by him. Song Jinyou was not sure if Jiang Yuan could see anything...

"I see that many people in the crowd are repeated..." Mu Zhiyang said tentatively.

His guess was the simplest and most natural. Not to mention the criminal returning to the crime scene, most people who committed crimes would be particularly concerned about the progress of the case.

This is a very natural practice. For most people, having a criminal case will become the biggest thing in their lives, and it is impossible not to care.

Song Jinyou listened to Mu Zhiyang's words, glanced at Jiang Yuan, and said: "The people in the photos are all villagers, and they were taken two or three days after the crime."

Mu Zhiyang said "Oh" and understood.

The photos of the scene were taken two or three days apart, and each photo was taken several days apart. At this time, it is really too inaccurate to force that there is a criminal in them.

If there is something wrong at the scene, the criminal has two or three days to go back and do it again. And the villagers who are watching are likely to be curious. After all, it is a village far away from the city. Suddenly a group of outsiders come, and they are policemen. It is normal to watch.

Furthermore, the shooting time cannot completely cover the time when everyone is watching. In this way, it is really meaningless to make speculations or analyses based on the onlookers in the photos.

"In this case, the criminal still has a chance to destroy the evidence." Tang Jia added.

Song Jinyou nodded: "This is a very troublesome point. The environment of Lanzhu Village is very closed. We can't wait there. As long as outsiders enter the village, they will be noticed. The news will spread quickly throughout the village. There is no possibility of hiding."

The expressions of several policemen present became more serious.

Although there must be traces wherever they pass, if the scene is destroyed once or even twice, the difficulty of investigation is too high.

In other words, for ordinary investigators and technicians, the traces of the places they pass are indeed different.

It's like changing a question, changing it again, and changing it again, and then asking candidates to do the questions. The later the questions are, the lower the score rate will be.

After all, there are only a few people who can understand it thoroughly. For technicians in police stations or county bureaus, the difficulty is beyond the scope.

So everyone looked at Jiang Yuan again.

Jiang Yuan smiled, picked out a few photos of footprints at the scene from a pile of photos, and said: "I think face recognition is not reliable, but the footprints at the scene are few after all, so we can still analyze them."

In rural environments, surveillance videos and even DNA are not particularly useful, and the latter decomposes very quickly in rural environments.

However, footprints are relatively easy to use in rural or wild environments.

On the one hand, there are many places in rural areas with soft soil, which are enough to preserve footprints. On the other hand, dust can also leave a lot of footprints.

In the photos taken by Song Jinyou, there are a lot of footprints left by the fish pond, pig pen, and donkey pen.

Jiang Yuan said: "Compared with the photos taken by the onlookers, the footprints are closer to the scene. I looked at the photos of the three eucalyptus, and the footprints of the fish pond eucalyptus are the most chaotic. It should be that someone has been to the scene for many consecutive days, but the footprints of the dead pig and dead donkey eucalyptus are well preserved. Although there are also traces of footprints for many days, it is basically possible to distinguish the footprints on the day of the eucalyptus, as well as the footprints of the next few days."

"Huh, can it be distinguished?" Song Jinyou was shocked and asked: "Then can the footprints of the same person today and tomorrow be distinguished?"

"In this environment, there is a high probability of distinguishing the footprints of the same person in the past few days." Jiang Yuan said: "For this kind of soft ground footprints, you can see the hardness of the edge and the color grayscale, which are relatively easy to distinguish..."

Song Jinyou laughed and didn't even bother to look at it. It's easy to distinguish. If it's easy to distinguish, the county's trace inspection can just jump off the building.

Wang Zhong next to him also laughed foolishly. He is a trace examiner, a footprint identification expert. He has to carefully distinguish the traces of pig trotters and donkey trotters before he can make a judgment.

"In short, we can screen out a few people through footprints." Jiang Yuan was not going to give them a lecture.

It is meaningful to give lectures to people who know the business, but to Song Jinyou, he doesn't need to convince Song Jinyou, he just gives orders directly, so there is no need to explain so much.

"This footprint is the most frequent." Jiang Yuan pulled over a photo and circled a footprint on it with a red pen.

"This footprint also appears frequently, and there are more footprints."

"This one also appears every time, the third most frequent."

"And this one, it appears every time."

Jiang Yuan marked out four footprints in total, and then said: "The first one is a female, 46 to 47 years old. Height 156 cm, weight about 130 catties."

"The second one is a male, 51 years old, height 165 cm, weight 150 catties."

"The third one is a male, 32 years old, 172 cm tall, and weighs about 170 catties."

"The fourth one is a female, 52 to 54 years old, about 155 cm tall, and weighs 120 catties."

As Jiang Yuan spoke, Tang Jia started to take notes.

After he finished speaking, Jiang Yuan looked at it again and pointed again: "From 1 to 4, the foot lengths are 21 cm, 24 cm, 5 cm, and 5 cm respectively."

Tang Jia recorded it as he said.

Song Jinyou frowned and looked at the photo: "Can you tell the length of the footprint directly from the photo?"

"It's the foot length, not the shoe length, that is, not the shoe length. Remember to measure it when you find someone." Jiang Yuan paused, pointed to number four again, and said: "This one has hallux valgus, and it's a bit serious. Remember it."

"Okay." Tang Jia quickly noted it.

Jiang Yuan then took a photo and handed the paper to Song Jinyou, saying, "Director Song, please send someone to check these four people or bring them here for interrogation."

"Okay, okay." Song Jinyou understood. Did this reduce the number of suspects to four?

If this is true, the case will become very simple.

There are only a few hundred people in a village. It is easy to lock in four people by screening according to height, foot length, weight, etc.

Similarly, if four people can be locked in in the end, it will not be too difficult to find the real culprit.

Song Jinyou immediately sent a few people on a business trip, and together with a few people from Jiang Yuan's side, they went straight to Lanzhu Village.

"The road is better now, but it is estimated that there will be no news until tomorrow. Let's take a rest and have a meal." Song Jinyou's politeness rose three levels.

Hearing that Jiang Yuan can solve a case, seeing that Jiang Yuan can solve a case, and being solved by Jiang Yuan, this is a three-level increase.

Song Jinyou now looks at Jiang Yuan as if he is looking at a wishing Bodhisattva.

The next day.

Eight police officers brought back four suspects.

Meng Chengbiao followed them back, and before going to the interrogation, he reported to Jiang Yuan: "It is most likely that it is number one Gan Jingying."

Jiang Yuan only asked: "Was it not a case of multiple people committing the crime?"

"No. The rat poison found in her home has never been poisoned by anyone else in her chickens, ducks, geese, and pigs, and she has grudges against various victims. In addition, Gan Jingying has an extreme personality and can't get along with anyone." Meng Chengbiao gave the reason, and then said: "I will pay attention to asking when I interrogate her later."

Jiang Yuan nodded, and he still trusted Meng Chengbiao's judgment in this regard.

Meng Chengbiao continued: "The other three suspects appeared at the three crime scenes with more reason. Only Gan Jingying didn't go to watch the excitement for the first two times, but there were footprints left at the scene..."

Meng Chengbiao went to the interrogation with a preset goal, which was not particularly in line with the standard. But in the world of criminal cases, there was originally no standard.

Gan Jingying was almost non-confrontational and confessed the crime process.

During the confession, Gan Jingying burst into tears and denounced the villagers for oppressing and humiliating her...

Jiang Yuan and others were in the monitoring room and felt a little bored.

Most criminal suspects are like this, and usually try to explain the justice of their actions.

A little-known fact is that most criminals think they are good people.

So, if self-identification is used as a standard, most parents' education is very successful.

Old policemen like Song Jinyou have a higher threshold of sympathy. After listening for a while, he said uninterestedly: "It turns out that he is a coward who only dares to poison in small doses."

"No wonder you couldn't detect the poison when you went there." Jiang Yuan also understood that Gan Jingying had not poisoned these dead things in recent months, including the previous few years. Instead, if she was dissatisfied with someone's family, she would throw a little bit of rat poison, and often mix it into the feed.

In this case, some livestock were poisoned to death, such as the recent pigs and donkeys, but there were also livestock from other families that were not poisoned during this period.

And when Song Jinyou sent someone to do the extraction, bring it back, and then go to the county bureau to queue up for testing, basically nothing can be detected. Of course, the technical level of Ningtai County Bureau is not good enough. If someone really died, the testing method would be different.

"Okay. Let's catch this person next." Jiang Yuan said as he exported a file, which was a small case he had today and last night.