Locking up the suspect is a very crucial step, but also the most difficult step, although Li Yi is mentally prepared for the blurred portrait, but Qin Gang's words are still very hard. A large amount of manpower has been used in this direction, and a lot of time has been spent, and if it is impossible to draw a single stroke, it will be twice as useless.

He turned out the on-site report and carefully browsed it, and all kinds of signs of on-site cleanup showed that this was a thoughtful person, so the three points and one line of the sports school, the woods, and the community were in line with the inertia of this kind of thinking, and it was indeed the best plan, even if he chose himself, he would arrange it like this, and his analysis was not wrong.

If you have to find out the shortcomings of this plan, it is that you must be familiar with the sports school environment, without this premise, this may be a next plan.

Li Yi knows that the key point is that the direction of the previous presumption cannot be negated, both wrong and right need to be verified, and if there is a slight block, the set direction will be overturned, and the direction will be directly denied, then the current will be at a loss.

His mind kept flashing portraits, surveillance, and wine.

The portrait of the accomplice is not clear, because he has perfectly evaded the surveillance, and it should not be possible to obtain the portrait information directly from the surveillance. But you can start with someone who understands the monitoring, like watching a video, and go back in time, starting with the construction monitoring, and no one will know the monitoring equipment specifications and network topology of the entire campus better than the person who implements the monitoring project.

From the beginning of the project bidding to the final project implementation, the equipment specifications and topology diagram in the project plan, will be browsed by many people inside and outside the school, if the project is implemented in the past year, it is very likely that the paper document of this plan can be found in the bidding center.

From the beginning to the end of the whole project, there is a relatively clear timeline and specific personnel can be traced.

"In any case, according to our previous direction, we can first determine a time period, this person must enter the school after 14:00, and this time is based on the earliest time of death of Li Yaling identified by the technical team. Leave by 23:00, otherwise he must go through the gate or over the wall. I estimate that he will not leave too late, too late West Gate will also be less people, alone at night waiting for the bus at West Gate, still very recognizable, there will always be people to see and vague memory, there are many such examples. If you want not to be obtrusive, the best option is to leave when there are many people. Li Yi said.

"I think so, too, and until we have a clear and definite divergence of directions, this direction will not change."

"Secondly, this person can cross the road and take a taxi or online car-hailing near the community opposite the sports school after coming out, and does not necessarily have to wait in the direction of the sports school. We can't determine the time when this person enters and leaves the site, using the time we simulated cleaning the site, if I enter the site around 3 o'clock, I can leave around 7 o'clock, I will choose to rent or ride-hailing; If you enter the scene at about 6 o'clock, the departure time must be after 10 o'clock, at this point in time, there are fewer people and fewer cars around the sports school, and if you want to try not to be noticed by more people and leave quickly, I will choose to drive. ”

Qin Gang raised his hand to interrupt Li Yi.

"Wait, no matter if you drive your own car or someone else's, you can't avoid traffic monitoring, you can't shoot people, but you will definitely be able to take pictures of the car."

Li Yi has already thought of this, "You can set cards, for such a thoughtful person, if you want to drive to the vicinity of the scene, you will definitely think of this trick, and the deck does not have any technical content, and it doesn't even need any professional tools." ”

Qin Gang nodded in agreement with Li Yi's statement.

"Then the key point is that this person knows very well what type of equipment is on the school surveillance, and he also knows the distribution of surveillance cameras well, so he can accurately find a path to completely avoid cameras in the school. So who has access to this information? All the bidding will be on the government affairs network, we can easily find the construction party, in the school, generally by the general affairs office or the information department to manage this kind of affairs, there will not be many people involved, and it is easy to investigate, I believe that we will be able to find a breakthrough from here. ”

Li Yi said that he was very sure that he had to give himself and Qin Gang confidence.

A school's monitoring construction project, there is no too high technical content requirements, all with government procurement qualifications of the integrator, and can provide equipment in line with ISO standards, can participate in the investment, in addition to equipment finalization, procurement, the construction plan must have a network topology map, as long as there is this map, the distribution of monitoring points on campus is clear at a glance.

As Party A will pay attention to the monitoring and distribution in the project plan, there should be a security department, an engineering department, and a backup of drawings.

Although Lao Qiu is an employee of Party A's unit, he is only an ordinary teacher, and the project has nothing to do with him, and he does not need to care, unless Party B of this project is introduced by him, but under the mechanism of public bidding, it is very difficult to operate.

And Shao Guoqing and Bian Wei are just people outside the school, and they shouldn't know about it, and once they know, they may have done it on purpose.

As Party B, only the technicians, construction personnel, and project managers in charge of the project know about the topology diagram, but it is difficult for these people to have a direct intersection with 1503.

Without sufficient preconditions for analysis and judgment, Li Yi's mind was also a little messy.

"Did we miss anything?" Li Yi said.

Qin Gang was also thinking hard, "Why did it happen that Shao Guoqing's car hit Mao Huide." ”

"I feel like you're jumping a bit, you're not talking about the 1503 case."

"I thought about it, and for some reason I suddenly thought of this question, maybe subconscious. When I came back, I hurriedly watched the video of us taking that part of the route, and I could actually shoot part of it, because we didn't deliberately avoid the camera. If you want to dodge the camera accurately, this person must also be very accurate and clear about the performance parameters of the camera, shooting distance, angle, etc. Who will this person be. ”

Li Yi and Qin Gang looked at each other and did not speak.

The sun is setting in the west, and the rays of the setting sun shine on the rows of houses in the city, inlaying golden borders on each house, and everything is bathed in the afterglow of the setting sun.

The color of the clouds next to the sunset changes very quickly, one moment lily, one moment golden, one moment half purple and half yellow, one moment half gray and half red, colorful and endlessly changing.

Gradually, the sky is dark, the remnant sun is like blood, and the sunset on the riverside is like a gold-edged sunset, which is round at this time, radiant, and the dazzling eye mask is like a dream, so unreal. The last trace of the remnant sun hit the ground and merged with the golden river water, and the golden light was shining.