There are many ways to identify a circuit board as identical, the simplest is to check the serial number and manufacturer's logo.
On this point, after Huawei launched its new CPU, many self-media adopted this idea. However, when manufacturers or assemblers deliberately concealed it, eroded the serial number and logo, or due to explosions, fires, etc.
If the cause is missing, the effect of this trick will be very limited.
Compared with checking the serial number and manufacturer's logo, a slightly more complicated solution is to scan the characteristics of the circuit board, or simply use image recognition technology to make an identification. This technology sounds very awesome, but in fact it is very sparse to use.
The technology is basically only useful inside the factory. Once outside the factory, for a field like criminal investigation, a database problem will kill people.
In the real world, there are many ways to identify various traces and identify them as identical. What really hinders technological progress is actually database technology.
Including the identification of footprints, shoe prints, palm prints, firearms, DNA, mitochondrial DNA, tire tracks, etc., all face database problems.
The software is easy to make, but the police really have to enter the data in the database one by one.
Over the years, there is a certain guarantee that the database entry of fingerprints and DNA can be used. Other types of databases are basically in a state of enclosure and are definitely not easy to use.
Therefore, Jiang Yuan has used the technology of scanning circuit board features before, and it is certain that it will not work.
In the end, Jiang Yuan was still arranging and combining components one by one. To put it more professionally, it means observing the arrangement of specific components and connectors.
Circuit boards of the same model can have similar components and connectors, but circuit boards produced by different manufacturers still have differences in the location and layout of different components.
In addition, it can be easily imagined that circuit boards produced by different manufacturers must have different components purchased. And many components are also marked and may not necessarily be erasable.
The circuit board picked up by the survey team was already in a tattered state, so in the end, the model of the circuit board could only be determined through the components themselves and the arrangement and combination of the components - the first step was to determine the manufacturer of the circuit board.
, for most trace inspections, after completing this step, the work is roughly completed.
In most cases, the police go directly to the manufacturer and ask the manufacturer's technicians to determine the model of the wreckage. The method is still the same, except that the manufacturer's pictures are more complete and the personnel are more familiar with their own circuit boards.
Jiang Yuan was similar, but after confirming the manufacturer, he sent someone directly there, then searched the manufacturer's computer for the same model and checked the manufacturer's sales records on the spot.
Then, the police officers flew to several sellers to extract and investigate further sales records.
Three days later.
At 3:30 in the morning, the ringing of the phone woke Zhang Dinghui from his dream.
When Zhang Dinghui sat up, everyone was confused.
The person next to the pillow also turned over and looked at his watch, and said helplessly: "Are there so many things going on recently?"
"As long as it's not a bad thing. Zhang Dinghui shook his head and answered the phone: "I'm Zhang Dinghui..."
"...We have determined the location of the suspect. The person on the other end of the phone is Deng Jiabin, the director of the Municipal Bureau.
Zhang Dinghui suddenly woke up: "Did you confirm the location directly?"
He also went to investigate again yesterday. To be honest, it was the supervisor. He was still under investigation at that time, and there was no news about Ning Ning.
"Yes." Director Deng Jiabin responded and said: "When the suspect purchased circuit boards, he used cash, but the store owner's cash register has time records. We found a card with a human figure where the suspect was walking that day.
At the intersection at the entrance, I went to the shop owner to confirm the suspect’s identity.”
Zhang Dinghui is actually very familiar with these investigative methods. Hearing this, he said "hmm" and his expression became more solemn. He asked: "What is the identity of the suspect? How does he know the relevant technology?"
"The suspect, Ji Haitao, is a farmer and is 68 years old. The technology of making explosives should have been learned during militia training. In addition, he has a record of using external networks, and he should also have learned some related technologies." Deng Jiabin answered.
He was very direct, telling the main content first, and then said: "This Ji Haitao worked as a construction worker and fired artillery in the mine. Later, he also led an engineering team. The purpose of committing the crime this time is very likely to be a conspiracy.
fiscal."
Zhang Dinghui breathed a sigh of relief. The suspect who was seeking money should not be so anti-social. What he was most afraid of was that the other party would cause explosions for no reason. This was what he was most worried about these days.
.
Deng Jiabin knew the leader's thoughts well, and continued: "We initially judged that the deceased wearing an explosive vest was Ji Haitao's accomplice. Judging from the descriptions of witnesses at the scene, the two entered the financial room at that time, and they should have wanted to use the explosive vest to...
It was a robbery, but we currently have no way of knowing whether the money was stolen or why the explosive vest exploded."
Zhang Dinghui said "Yes" again. Even if the 68-year-old criminal suspect is in good health, it is very difficult for him to monologue and rob a gambling house, and it is not easy to control another person. The accomplice is indeed a more reasonable guess.
"Does he still have explosives in his hand? Zhang Dinghui asked.
Deng Jiabin: "In this regard, we are similar to our previous speculation. There should still be some. However, Ji Haitao has not shown a tendency to make homemade explosives. He mainly obtains materials through some channels. From this perspective, the explosives in his hands are
It shouldn’t be too much. In addition, Ji Haitao’s economic conditions are relatively average, and the explosives he used this time may even have been accumulated in the past.”
Zhang Dinghui knew that Deng Jiabin was trying to comfort him, but he did feel a little relieved. Looking at his wife who was sleeping restlessly next to him, Zhang Dinghui got up and took the phone. As he walked out, he asked in a deep voice: "How are you going to arrest her?"
Suspect? What’s the situation at the scene?”
"The house Ji Haitao rents is in the Anyuewan community on the outskirts of the city. It is a 28-story high-rise residential building with a tower structure and a small apartment. There are many neighbors above and below, and there are 6 households on the same floor, all of which are full. One of them is full.
The room was shared by several people. There should be more than 20 people on a single floor. Deng Jiabin only mentioned the residents on the same floor, not those upstairs, which made Zhang Dinghui feel a strong sense of crisis.
"We can't arrest him inside the house." Zhang Dinghui said flatly: "Either we trick him into trapping him... or we see what other plans you have."
Zhang Dinghui was already relatively open-minded and did not directly give a direction for his subordinates to take. Even so, he definitely rejected the idea of arresting people inside the residence.
Deng Jiabin also expected this. Although at this point in time, secretly sending people to sneak into the suspect's house and arrest him is still a plan, but the danger of this plan is also undoubted.
Even with the addition of various advanced instruments, such as thermal imaging cameras, night vision devices and other equipment, you still cannot fully understand how the suspect placed and handled the explosives.
What if this person has some delusions of victimization - which is not considered a delusion now - and if he comes up with some strange switches or tricks for explosives, or even makes a booby trap on the door, it will be a big problem.
However, it may not be that easy to deceive people.
Deng Jiabin didn't dare to guarantee it, so he could only say: "I will go to the scene to direct now and convey your instructions clearly!"
