National Forensic Doctor

Liu Jinghui followed Jiang Yuan's steps and measured the nearby route.

Yuan Bomin is busy collecting nearby surveillance, which is a meticulous job. In contrast, cameras for police-citizen cooperation are easy to obtain, but it is very troublesome for some small stores to install their own surveillance cameras. Some simply use home surveillance cameras similar to those from Xiaomi, and the purpose may be just to check the checkout counter. Or if your own goods are not strictly managed, the stored videos are also in a mess. These may need to be taken back and sorted out before they can be used.

In fact, Yuan Bomin himself is not sure what the use of these videos is.

However, since Jiang Yuan wanted it, he had no hesitation.

The video collection is useless, that’s normal. Jiang Yuan couldn't let Jiang Yuan have nothing to use when he needed to check the video surveillance.

Yuan Bomin guessed that Jiang Yuan might want to check the suspect's means of transportation, and specifically ordered: "Even if the drug dealers separate people and goods, someone will eventually put the drugs at the trading location, and this person will most likely take the car, so , the surveillance near the driveway needs to be tightened..."

"Yes." The subordinates showed some respect.

Yuan Bomin said a few more words and emphasized: "Some surveillance cameras have been left for a long time. Those people may have forgotten about them, so they should remember to put them away. For example, in the security booth in the parking lot, the monitoring of the security booth is closely related to the police system. For those connected to the Internet, some bosses have to put them away to monitor the computer in the security room. There are also cameras near the road, such as the cameras in the elevator. They cannot be seen when the elevator goes up, and when the door opens when it comes down. You can see it..."

"I got it, Captain Yuan." The team members began to dislike the captain's long-winded tone, and his tone was quite stiff.

Yuan Bomin said helplessly: "Don't think I'm verbose. The more bizarre the surveillance is, the more surveillance is in a location we wouldn't expect. It's not easy for the suspect to think of it. Maybe he will show up, right."

"I know, Captain Yuan!" The tone of the subordinates became even harsher.

The guard next to him was so idle that he helped translate: "They must really dislike your verbosity."

Yuan Bomin glanced at Wei Shijun: "Don't I know?"

The team members also glared at Master Wei: "Children, go ahead. Even if Captain Yuan is really verbose, we can't possibly tell him."

"Okay, okay, I'm the one who was blabbering." The health teacher walked away and found himself among the crowd of the criminal police detachment. He said helplessly: "The anti-drug people are really difficult to deal with. I just wanted to have a few words and brainstorm. No fun at all. Do you feel the same way?"

"Yes, Master." The tone of the detectives made Wei Shiqu feel familiar.

Liu Jinghui followed Jiang Yuan for several streets and began to feel a sense of deja vu. He couldn't help but said: "These newly built roads are all like this. They look almost the same. Let's look at them one by one like this. What do you think?" What are you looking for? Want to find a sure path for the suspect? "

"It would be great if there is a way to go." Jiang Yuan spread his hands.

Liu Jinghui smiled: "The roads here are all extending in all directions, and they are all new roads. There are only a few crowded roads, and there are no dead ends."

"I'm also thinking about this issue." Jiang Yuan said while looking on both sides: "If you were a drug dealer, when you go in and out of here, would you choose the road with fewer people or the road with more people?"

This was a matter of reasoning. Liu Jinghui was shocked, thought for a while, and said: "The advantage of choosing a road with many people is that it is easier to blend in with the crowd. There are less surveillance here, and it is a suburb that has been annexed by the city. The county has a complex population and a large floating population, so there are many people to choose from. The route is more difficult to find and has a high error tolerance rate. The disadvantage is that once discovered, it is not easy to run. The roads with many people are converted from old roads, the road surface is not wide enough, and many are operated by electric vehicles and stalls. Once you get blocked, you basically can’t escape.”

Zhongxin Road is a big road, and it is also the main road connecting Wujiaige to the urban area. However, on both sides of Zhongxin Road, the situation is more complicated. There are newly opened roads, which are wide and straight, with few people and cars, and there are also reconstruction of old roads. When reconstruction is based on county roads or village roads, traffic conditions deteriorate sharply.

Jiang Yuan smiled: "The error tolerance rate is high, but it is difficult to run if you make a mistake. As a result, the error tolerance rate is reduced."

"It depends on how you think about it. The good and bad of routes with few people are exactly the opposite, and the error tolerance rate is low. For a period of time, he may be the only car on a road, and it is easy to find it with surveillance. But it is easy to run... However, given our domestic environment, it is actually very difficult to find out.”

"Not necessarily. For drug dealers, if they prepare a safe house or an escape route, there is still a certain probability of escape." Jiang Yuan also has some experience in chasing and escaping. In short, it is very difficult to escape without preparation, but if you are prepared to escape, you may directly leave the provincial or even national borders, or you may stay in a safe house with food and drink without going out for a long time. , there is still a chance of escaping.

But no matter which plan is used, it will require a lot of money to prepare. Needless to say, when traveling abroad, the toll and smuggler's fees are not a small sum. Safe houses are even worse. You can use rented houses as safe houses abroad, but it is very difficult in China. Landlords and neighbors will always cause trouble. It is best to buy your own house, prepare a large number of supplies, and replace them from time to time. This is The area is also required to be large, and the total cost is not small.

Liu Jinghui's thinking was very direct. He shook his head and said, "If you want to consider that there are fewer people and it is easier to run away, then there is no need to meet here. Some transactions are made in the wilderness. Find a place with fewer trees and mountains. Standing on the top of the mountain, you can see if there is anyone following you. Trading on the top of the mountain is easy and clean."

"So you prefer the suspect to take the road with more people." Jiang Yuan asked.

"Yes. I think the right choice is the route with more people. Preventing being discovered is the most important thing. Another thing is that the suspect chooses this place. It is likely that the suspect is familiar with this place, or works and lives nearby." Liu Jinghui thought about it and said, "As we said before, drug dealers who make so much money can't keep their money in the bank. They can't dig holes and bury tens of millions of cash every day. There are always expenses. There are still a lot of fun things in Lanyue City."

Jiang Yuan nodded slowly.

Liu Jinghui was afraid that Jiang Yuan didn't understand, so he whispered again: "Film and Television City."

"Money laundering?" Jiang Yuan understood a little.

Liu Jinghui sighed: "Liu Wenkai."

"Oh..." Jiang Yuan understood immediately.

"Of course, it could also be gambling or something." Liu Jinghui changed the subject: "Will this help catch people?"

"No." Jiang Yuan spread his hands and said: "From this angle, Captain Yuan should have chased him."

"He should have run away. You can ask again. Prostitution, gambling and drugs are inseparable. Drug lords also have to live." Liu Jinghui paused and asked: "Or list the time when Li Sige and Zhi Baoji traded, and then see who appeared repeatedly in the vicinity during the corresponding time. This is a stupid way, right? Will it work?"

Jiang Yuan thought for a long time and said: "It's a bit too stupid."

Liu Jinghui didn't care if his opinion was rejected. He had been like this all these years. He just asked curiously: "How stupid is it?"

Jiang Yuan Said: "First of all, the other party separates people from goods. This means that the delivery may be made by the person himself or by a postman, or even by a different postman each time. If this is the case, this method cannot be used."

Jiang Yuan: "Secondly, even if there is a fixed person delivering the goods, the time of delivery is not fixed. It may be half an hour or even ten minutes in advance, or it may be a day in advance. In this case, the scope is too large."

Jiang Yuan: "Third, the scope is also the scope of geographical factors. Their trading locations are not fixed. This means that a lot of videos need to be collected, and videos of very long time and different locations need to be watched..."

Thinking of this workload, Jiang Yuan couldn't help shaking his head.

"Okay. It means that even if we pile up people, we can't get it done?" Liu Jinghui asked.

"At least it can't be piled up like this."

"Where's Xu Taining?"

Jiang Yuan laughed: "You're making it too difficult for him..."

After a pause, Jiang Yuan thought about it a little uncertainly, and shook his head again: "There is too little information now, and the natural shortcomings are still not enough."

"Then what's your solution?"

"According to the theory of geographical profiling, draw a circle with the transaction location as the center, and the intersection area of ​​the circles of multiple transactions is the suspect's residence or workplace..." Jiang Yuan first talked about the theory, and then said: "How about we put this theory into practice?"

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