Zhang Mengyao's body was found in the Experimental Primary School, where he worked.
Let’s not talk about why the murderer did this. Just saying that the murderer was able to put the sculpture in the experimental primary school shows that the other party must be familiar with the experimental primary school.
Based on this clue, the possibility of the other party working in an experimental primary school is very high.
So when Zhang Mengyao had already left school, who else had left with him?
Judging from the investigation of Zhang Mengyao’s residence, there is no possibility that the other party will go home alone.
Either he didn't go home, or he went home but took the car to the underground parking garage.
Because the entrance of the community is monitored, if Zhang Mengyao goes home alone, the way he usually goes home should be from the entrance of the community, so the surveillance will definitely be able to photograph him. In this way, Zhang Mengyao should be able to investigate this when investigating the disappearance case.
So he either didn’t go home, or he would have taken a car back through the basement.
Judging from the on-site investigation, Lu Chuan is more convinced of the second possibility.
Because the lace suspender skirt Zhang Mengyao was wearing when she was murdered was probably hers.
Then here comes the problem.
Zhang Mengyao didn’t have a boyfriend at the time. Who did she go home with? And he left school long ago.
The surveillance screen passed by frame by frame, and everyone entering and leaving the school was marked by Lu Chuan.
Soon, a total of four people were marked.
After Lu Chuan called Zhang Hui over, he gave the information of these four people directly to him.
"Brother Hui, go check on the situation of these people here first. Zhang Mengyao was the only one before and after leaving school that day. He left early."
After Zhang Hui got the surveillance screenshots of the four people: "Huh? I know this guy."
Among the four people, Zhang Hui pointed at one of the fat middle-aged men and said.
After Zhang Mengyao's body was discovered, Zhang Hui had already known about the situation at the Experimental Primary School. He had seen basically all the teachers.
“Who is this?”
"Principal, I was the vice principal of the Experimental Primary School back then, and was promoted to principal two years ago."
Lu Chuan nodded, but didn't care. He continued: "In addition, the school asked for leave on the day Zhang Mengyao disappeared. The staff, including teachers, and all other personnel, can check it out."
"Okay, I'll arrange it now."
Lu Chuan's side will check the monitoring. It was already past four o'clock in the morning, and of course I couldn't go to school at this time.
When we returned to the Hong Kong office, Liu Guorong and the others did not go home again this time. They had been busy all night and were now sleeping on the sofa for a temporary rest.
There are a total of 4 sofas in the office, and this time they are all occupied. I exposed them and thought about whether I should stay here or go home.
Early the next morning.
Lu Chuan and Shen Yan work together.
"Send you to the criminal investigation detachment first, and then I'll go to the criminal police brigade to have a look."
Lu Chuan is just helping to handle the case, so naturally it is impossible not to go to work in his own unit, but to keep Stay with the Criminal Investigation Detachment.
"Okay."
Shen Yan obviously hasn't had a good rest recently.
The eyes are a little red and swollen, and the bags under the eyes are dark, which seems to be the reason for not sleeping well.
But Lu Chuan couldn't persuade him that he would have to work overtime and stay up late when encountering such a murder case. No one in the entire team could get a good rest.
Zhang Hui from the Criminal Investigation Detachment did not go home last night. At dawn, he went directly to the Experimental Primary School with the information on several people Lu Chuan discovered yesterday. He checked one by one what was going on with these four people? Why did you leave that day? Are there any witnesses there?
Time passed quickly, and two days passed in the blink of an eye.
Lu Chuan did not go to the criminal investigation detachment in the past two days, but Zhang Hui came over.
But looking at the other party's somewhat decadent face, I knew that there might not be much progress in the investigation of the case.
Pouring Zhang Hui a glass of water, Lu Chuan asked: "How is it? What's going on with those people?"
Zhang Hui shook his head.
“The principal went to the Education Bureau for a meeting. Among the other three people, there was a physical education teacher who usually left early, a math teacher who asked for leave because of family matters, and a cleaning lady who also asked for temporary leave because of family matters. "
To be honest, there are too few clues in this case. Zhang Hui originally thought that Lu Chuan had provided him with some clues, and if he continued to pursue them, he might gain something.
But in the past two days, he has screened all the teachers or other staff who were not in the school when Zhang Mengyao disappeared that day.
As a result, nothing was found. Everyone who asked for leave that day had legitimate reasons, and they all had witnesses.
Lu Chuan sighed.
This is what solving a crime is like. Sometimes all the clues have been searched and followed, but there may not always be a good result.
“Now it’s up to Master to identify the trace evidence.”
Lu Chuan comforted Zhang Hui.
I just hope that the murderer will leave any clues when he was putting on the plaster.
Otherwise, this case would be really difficult.
Time passes quickly.
In the blink of an eye, another week passed and there were some small cases in the Criminal Police Brigade. Lu Chuan did not personally participate in them and directly asked several squadron leaders to deal with them.
The case at the Criminal Investigation Detachment is still progressing, but other clues have basically been stopped, and only some basic interviews and investigations are being done.
Liu Guodong and the others, on the other hand, have basically stayed up late and worked overtime every day for the past week. After all, micro-interaction analysis is a delicate job, and the amount this time is so large, so it is very difficult for them to do it. .
This kind of thing must be done carefully and not carelessly. Otherwise, if you miss a few clues, you may really miss the things left by the criminal suspect.
So every experiment and glass extraction requires the close cooperation of several people. If you do it seriously, you can't let down your guard at all.
On the 20th day after the incident.
Criminal Investigation Detachment, Yang Lin has not returned home since the incident.
I stay in the office every day, basically spending time in the laboratory of 1.5 Middle School, doing endless tasks every day.
But Lao Bai couldn't do it. Lao Bai was getting older and his body couldn't bear it, so in the next few days, Lao Bai basically went home to sleep at night.
"Yang Lin, the extraction of specimen No. 167 is almost done. You can use it to do this."
Yang Sen also worked overtime and stayed up late for twenty days. He was so busy that he didn't have time to trim his beard. Now He had an unshaven look on his face.
"Okay, I'll go right away."
Having just completed the identification and analysis of another specimen, Yang Lin quickly put the extracted specimen No. 167 into the instrument.
Extraction in trace substance analysis is relatively time-consuming, but once the extraction and corresponding pretreatment are completed, identification is relatively fast. (End of this chapter)