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Chapter 1192 Not Easy
Chapter 1192 Not Easy
"Investigation?"
They were busy until dark, and the captain of the image reconnaissance team came over and asked Jiang Yuan for instructions.
Their early progress was very fast. It took only half a day for them to find the surveillance video of the suspicious vehicle. If it weren't for the fact that the night-time shooting capabilities of several cameras were too weak, this case should have been a typical example of being solved quickly.
For the same reason, when the existing surveillance videos cannot be used, all the Image Detective Squad can do is conduct a large-scale inspection of the vehicles involved in the incident.
Logically speaking, the suspect vehicle drove past the fence of the company at 4:10 a.m. and turned around 4 meters ahead at 50:300 a.m., so the time of the crime is basically certain. If the time is slightly extended and the vehicle checkpoints on national highways and expressways are checked, especially those on national highways, there is a high probability that the suspect 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 designed to run at night.
Without knowing other information about the vehicles, it would take an hour or even longer to check the vehicles passing through the national highway, especially with so many vehicles from other provinces. The workload would be at Xu Taining's level.
Jiang Yuan had done a lot of similar investigations before. 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 work, so someone has to help coordinate. The forces mobilized include but are not limited to Yu Wenshu, Jiang Yuan, provincial departments and even ministries...
Once the investigation reaches this level, according to Xu Taining's investigation theory, it is best to check all vehicles passing through the highway. Although the probability is very low, but if it is done to this extent, it is not a big deal to increase the number several times...
"Although it is a method, it is too inefficient." Jiang Yuan has also been thinking about it. He did not completely reject the opinion of the captain of the image detection team at this time. Instead, he looked at Liu Jinghui and asked, "What do you think, Director Liu?"
"If we want to investigate in this way, the clues we have now are not enough." Liu Jinghui analyzed calmly: "We have initially determined that it was an insider. After checking the relevant vehicles, we also need to compare them with the chemical plant's employee list and former employee list... In normal procedures, this investigation strategy is definitely fine, but for a super large investigation, the evidence we have obtained so far is too insufficient."
Wang Chuanxing, who was beside him, had been taking notes the entire time. He said leisurely, "It was your reasoning that led you to conclude that the criminal was an insider."
Liu Jinghui glanced at Wang Chuanxing sharply: "Reasoning! No! Not talking about evidence!"
The captain of the Image Detective 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 Director Liu has started talking about evidence, then we should really look for more evidence."
Liu Jinghui felt that his waistline was about to swell with anger, and repeated: "Reasoning is a judgment made after combining evidence from all parties... How about checking the footprints?"
Liu Jinghui is also extremely familiar with the skills that Jiang Yuan has mastered.
There are two most commonly used evidences in theft cases: fingerprints and footprints. For ordinary criminal police, the former is the most commonly used, but for more advanced theft cases, footprints are the killer. Thieves can avoid fingerprints by wearing gloves, but they can't float in and out of houses.
Although the footprints at the crime scene were messy and damaged, they were ultimately 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 idea.
Jiang Yuan looked down at Liu Jinghui and said, "The height, weight and age of the factory workers are not very different. They all have the same job and wear acid- and alkali-resistant work shoes issued by the factory. Plus, they step on each other repeatedly, so it is very difficult to match the footprints with the people."
"'Very difficult' means it can be done, but it's difficult?" Liu Jinghui tried to translate.
"Not only that." Jiang Yuan said: "We need to compare them one by one, and we need samples."
Liu Jinghui translated again: "That is to say, in theory, we can find the footprints of all the current employees and analyze and compare them. If there are footprints of non-current employees at the scene, then we can judge that they are suspects. However, if we want to confirm the identity of the suspect, we still need footprints for comparison, so we have to send criminal police to find all the former employees and collect their footprints..."
Without Jiang Yuan's further explanation, Liu Jinghui had already realized the difficulty: "There are a large number of employees who have resigned, 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 unusable. If there are no other clues, this solution can be tried reluctantly.
The direction of investigation that can get a 100% answer is more difficult than catching a knife with bare hands.
"Let me think about it again..." Liu Jinghui entered a 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 do we analyze it?" the captain of the image detection team asked immediately. He had also been watching the video for such a long time, but he still had no idea.
"The surveillance video doesn't show any suspicious vehicles, but look here..." Jiang Yuan took out the surveillance video of the vehicle turning around and said, "Although the appearance of the vehicle is unclear, the image of the vehicle's headlights shining on the ground is still very clear."
"This..." The captain of the image reconnaissance 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 the vehicle headlights. The layout of the headlights of different vehicles is still different. Although there are nesting doll cars, if we can determine a brand, it can still reduce a lot of workload."
"Can you do it?" Liu Jinghui suddenly became alert and stopped thinking.
Jiang Yuan nodded: "You can try it."
Jiang Yuan also has LV3 vehicle trace identification, and with the corresponding image detection technology, it should be no problem to narrow the scope to a certain extent.
Wei Shijian, who had been listening attentively, came over and looked at the two blurry beams of light on the screen in front of him. He asked hesitantly, "How do we analyze this? Using mathematics?"
"Do you have any ideas?" Jiang Yuan asked Wei Shixun.
Wei Shixun really thought about it for a moment, then his whole body trembled violently, and he whispered tentatively: "Use linear algebra?"
Although he didn't study seriously, he was really buried in linear algebra for two days.
Jiang Yuan looked at Wei Shijian and asked curiously, "How do I use it?"
"Calculate based on the projected area?" Wei Shixun tried, "Maybe we can estimate the height of the vehicle or something..."
Jiang Yuan listened carefully, nodded, and said, "You can try it. Just treat it as your homework."
"Oh... Hey, I do it myself? What about you?" Master Wei asked hurriedly.
"Let's just go to the site to experiment." Jiang Yuan gestured on the screen twice and said, "When we get there, just measure the distance between these two points and you'll know the headlight spacing. Find another car, drive it to the same location, and look at the position of the headlights, and you'll be able to determine the height of the car..."
Jiang Yuan gave a brief explanation and the people around him all understood.
Wei Shijian also understood, but he didn't understand and asked: "So, what is linear algebra used for?"
When I looked up, Jiang Yuan and the others had already gone far away.