Chapter 1192 Not Easy

"Investigation?"

After working until dark, the captain of the Image Detective Team came over and asked Jiang Yuan for instructions.

Their early progress was very fast. It took only half a day to find the surveillance video of the suspicious vehicle. If it weren't for the weak night shooting capabilities of several cameras, this case should have been solved quickly.

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For the same reason, when the existing surveillance videos cannot be used, the Image Detective Team can only conduct a large-scale investigation of the vehicles within the time of the crime.

In theory, the suspicious vehicle drove through the fence of the stolen company at 4:10 in the morning and turned around 300 meters ahead at 4:50. The time of the crime is basically determined. If the time is slightly extended and the vehicle checkpoints on the national highway and expressway are checked, especially the vehicle checkpoints on the national highway, there is a high probability that the suspicious vehicle can be put in.

However, this job is definitely not easy.

The traffic around Changyang City is busy. Even at 4 o'clock in the morning, there are still many vehicles coming and going, especially freight vehicles, some of which are specially running at night.

Without knowing other information about the vehicle, it takes an hour or even longer to check the vehicles passing through the national highway, especially with so many vehicles from other provinces. The workload must be at the level of Xu Taining.

Jiang Yuan has done a lot of similar inspection work. Apart from other things, if you want to quickly obtain vehicle information, you have to send people to other provinces or even different cities. Some people are difficult to talk to, or they are busy with local work, so someone has to help coordinate. The forces used include but are not limited to Yu Wenshu, Jiang Yuan, provincial departments and even ministries and commissions...

Once the inspection reaches this point, according to Xu Taining's inspection theory, it is best to check all the vehicles passing through the highway. Although the probability is very low, we have already done this, and increasing the number several times is actually a small matter...

"Although it is a method, the efficiency is too low." Jiang Yuan has been thinking about it. At this time, he did not completely reject the opinion of the captain of the image detection team, but looked at Liu Jinghui and asked: "What do you think, Director Liu?"

"If we want to investigate in this way, the clues we currently have are not enough." Liu Jinghui analyzed calmly: "We initially determined that it was an insider. After checking the relevant vehicles, we also need to compare them with the list of employees and former employees of the chemical plant... In terms of normal procedures, this investigation strategy is definitely fine, but for a super large investigation, the evidence we have obtained from the current investigation is too insufficient. . "

Wang Chuanxing, who was taking notes, said leisurely: "It is your reasoning that the criminal is an insider, Liu."

Liu Jinghui looked at Wang Chuanxing sharply: "Reasoning! No! No evidence!"

The captain of the picture investigation team also realized that the investigation he mentioned represented a huge workload and investigation cost, as well as the responsibility he needed to bear, and he couldn't help but back off: "Since Liu has started to talk about evidence, we should really look for more evidence."

Liu Jinghui felt that his waistline was about to swell, and repeated: "Reasoning is a judgment made after combining the evidence from all parties... How about checking footprints?"

Liu Jinghui was also very familiar with the skills that Jiang Yuan mastered.

There are two most commonly used evidences in theft cases, one is fingerprints and the other is footprints. For ordinary criminal police, the former is the most commonly used, but for higher-level theft cases, footprints are a killer. Thieves can avoid fingerprints by wearing gloves, and they can't float in and out of houses in the air.

Although the footprints at the crime scene were messy and damaged, they were, in the final analysis, just the footprints of dozens of people. If Jiang Yuan could identify them one by one and then investigate these dozens of people separately, it would be a good way.

Jiang Yuan looked down at Liu Jinghui and said, "The height, weight and age span of factory workers are not big. They are engaged in the same profession and wear acid-resistant and alkali-resistant work shoes issued by the factory. In addition, they are repeatedly stepped on. It is very difficult to match the footprints with the people."

"Very difficult means that it can be done, but it takes effort?" Liu Jinghui tried to translate.

"Not only that." Jiang Yuan said: "We need to compare one by one, and we need samples."

Liu Jinghui translated again: "That is to say, in theory, we can find all the footprints of the employees in service and analyze and compare them. If there are footprints of non-employees at the scene, we can judge them as suspects. However, if we want to confirm the identity of the suspect, we need to compare the footprints, so we have to send criminal police to find all the former employees and take their footprints..."

Without Jiang Yuan's words, Liu Jinghui has realized the difficulty: "The number of former employees is large, and they may not all stay in the province. Moreover, the criminals may deliberately avoid our investigation... Well, if it is a conspiracy, the footprints left at the scene may be left by the criminals who are completely out of sight."

The last point is the most fatal, which reduces the feasibility of footprint investigation by more than two levels. Of course, it is not that it cannot be used. If there are no other clues, this plan can be tried reluctantly.

The direction of investigation that gets 100% of the answer is more difficult than 100% of the bare hands to catch the knife.

"Let me think about it..." Liu Jinghui entered the state of self-reform.

Jiang Yuan thought about it for a long time. Seeing this, he said, "In this case, I think we should just analyze the vehicle."

"How to analyze?" the scout team leader asked immediately. He has been watching the video for so long and still has no idea at all.

"You can't see the suspicious vehicle from the surveillance video, but look here..." Jiang Yuan took out the surveillance camera when the vehicle turned around and said, "Although you can't see the appearance of the vehicle clearly, the headlights of the vehicle are shining on the ground. The picture is still very clear.”

"This..." The captain of the scout team looked at Jiang Yuan, not knowing what to say or what to ask.

Jiang Yuan said directly: "I think we can analyze the layout characteristics of vehicle headlights. The headlight layout of different vehicles is still different. Although there are matryoshka dolls, if you can determine a brand, it can still reduce a lot of workload. ”

"Can it be done?" Liu Jinghui suddenly became energetic and his ongoing thinking stopped.

Jiang Yuan nodded: "You can give it a try."

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Jiang Yuan also has LV3 vehicle trace identification, and with the corresponding image detection technology, it is no problem to narrow the scope to a certain extent.

Wei Shijin, who had been listening carefully, came over and looked at the two blurry light beams on the screen in front of him, and asked hesitantly: "How to analyze this? Use mathematics?"

"Do you have any ideas?" Jiang Yuan asked Wei Shijun.

Wei Shijun really thought about it for a moment, then his whole body trembled violently, and he asked in a low voice: "Use linear algebra?"

Although he didn't study it seriously, he was really buried in linear algebra for two days.

Jiang Yuan looked at Master Wei and asked curiously: "How to use it?"

"Calculate based on the projected area?" Wei Shijun tried: "Maybe we can estimate the height of the vehicle or something..."

Jiang Yuan listened carefully, nodded, and said: "You can give it a try, just treat it as your homework."

"Oh... Hey, should I do it myself? What about you?" Master Wei asked hurriedly.

"We can just go to the site for an experiment." Jiang Yuan gestured twice with his finger on the screen and said: "Go to the site and directly measure the distance between these two points, and you will know the distance between the headlights. Find a car again, Drive to the same position and look at the position of the headlights to determine the height of the car..."

Jiang Yuan gave a brief explanation, and everyone around him understood.

Wei Shijun also understood, but he didn't understand and asked: "So, what is linear algebra used for?"

Looking up, Jiang Yuan and others were already gone.