Tu Qijun now understood the meaning of his own strengths.
"Du Suo, doesn't the detachment also owe us a favor? We can't count on the Zhongcheng branch, but we can still count on the detachment."
"Eat quickly. After eating, we still have to go to the two crime scenes yesterday."
As Du Dayong spoke, he took a big bite of the steamed bun.
At almost two o'clock in the afternoon, the two drove to the first crime scene, Wenmo Lane.
"Tu Qijun, let's do a detective experiment. You pretend to hit me, and after I fall to the ground, you hit me again and pick my pocket. I'll take the stopwatch first, and then you can run all the way to Xinlin Avenue with the stopwatch and see how long it takes.
How many."
After saying that, Du Dayong took out the stopwatch from his bag.
"When I say start, I press the button, and you start pretending to hit me."
Tu Qijun nodded, and then Du Dayong spoke loudly.
Tu Qijun started to act based on the general situation he got from his inquiry, and finally ran all the way to Xinlin Avenue with a stopwatch before turning back.
"Du Suo,..." Tu Qijun gasped a little.
"I took a look and found that if it is completed very quickly, the whole process will take about three and a half minutes in the fastest case. Taking into account the darkness, the estimated duration should be four and a half to five minutes."
"Okay, let's test how long it takes to get to Ankang Road. This time I'll pretend to attack you, and then I'll run to the fork on the right to go to Ankang Road."
After Du Dayong finished speaking to Tu Qijun, he handed the stopwatch to Tu Qijun first.
Du Dayong then conducted a reconnaissance experiment based on another situation.
After returning, Du Dayong calmed himself down first.
"The whole process took six minutes, and it is estimated to take about seven minutes at night. Now let's do another experiment of entering the fork in the road and walking to the two roads with normal gait."
Tu Qijun looked at Du Dayong with some confusion.
"This is to take into account that the criminal suspect is not in a state of leaving in a hurry. With such a time difference, no matter which road he is on, there will be passers-by who appear at a fixed time. Therefore, no matter what state the criminal suspect is in, he goes out to two
We will not make any omissions on any road. From tonight, you will bring a few more people to look for passers-by on the two roads during this period to ask about the situation. If you don’t get anything today, then come back tomorrow. If you don’t get anything tomorrow, come back the day after tomorrow.
As long as it takes a week, as long as the suspect appears, I believe someone will see it."
Tu Qijun's eyes gleamed when he told Du Dayong.
Du Dayong has no choice but to use the method used in the Fang Xiujuan case (the student case). At least Du Dayong feels that within this time frame, someone should have seen someone passing by with a stick or something like that.
.
After leaving the scene of the crime, the two people came to the place where Si Lijun lived.
Du Dayong took a brief look at the crime scene. It was really difficult to find clues here because there were several big trees next to the grove. Du Dayong and Tu Qijun were all hiding behind them, and Tu Qijun could only reveal half of his body at most.
There are also garbage bins and old carports. There are a lot of debris piled up, which is not only easy to hide people, but also there are many people here to take out garbage in the morning. It is simply impossible to collect footprints here.
These are nothing, because there are many escape routes here. The open old community is simply connected in all directions. Even the tools for committing crimes are very easy to find here. The old-fashioned carport is full of debris and wooden sticks.
It's just a lot. It's no problem to take out ten or eight of them now.
"Tu Qijun, the crime scene here has no evidentiary value, let's go."
"Du Suo, are you finished reading now?" Tu Qijun felt that this speed was too fast.
When Du Dayong analyzed the scene environment in this way, Tu Qijun finally understood and nodded repeatedly.
"Du Suo, since the environment here is so messy, does it mean that the suspect should be familiar with this place? Otherwise, there are so many messy things here that he would trip over if he couldn't run.
"
Du Dayong looked at Tu Qijun with very approving eyes for the first time and said.
"This analysis is very correct. It seems that you have indeed improved a lot now. According to the location where Si Lijun said he was attacked, we can obviously see that those who arrived behind him at night to attack must be familiar with this place. This kind of
Familiarity does not necessarily mean that I have visited the place many times, but the suspect must have been here before."
Tu Qijun asked with some confusion.
"Du Suo, why haven't you visited this place many times? If you're not familiar with this place, don't you need to take a closer look?"
Du Dayong shook his head and said.
"There is a cognitive misunderstanding here. What if this person is a person with particularly strong spatial thinking? As long as a person like this comes once in the afternoon, as long as there are no major changes in the things here, this kind of person will basically not make mistakes. There is another point.
People with obsessive-compulsive disorder don't mean that they have strong spatial thinking, but that their memory of key points is extraordinary. Once they form a memory, this type of person will check it again even after committing a crime.
Is there anything I have neglected?"
As Du Dayong spoke, he pointed at the big trees and debris.