Chapter 586 Personal Inspection

Zhang Chaoyang continues to investigate which pawn shops or lending companies Chen Ziqiang borrowed money from. Finding out these details may play a positive role in the detection of the case.

Although this possibility is unlikely, at present, without any clues about Chen Ziqiang's disappearance, no details can be left out.

After all, if Chen Ziqiang fails to pay the money, there is still a possibility of being imprisoned.

Zhang Chaoyang, Chen Ziqiang's parents, also did some investigation, especially whether there were any changes in the information of the two people's bank accounts.

If the other party really imprisoned Chen Ziqiang for paying back the money, he would definitely ask his parents for money.

Li Yun is investigating the group fight caused by Tian Feifei last year.

Chen Yan didn't rest either. In the experimental building where Chen Ziqiang disappeared, Chen Yan was carefully inspecting every room.

Within the area where Chen Ziqiang disappeared, apart from a 100-meter-long road, there was only this experimental building.

There is nothing special about the road. As soon as you see it, you can see that several manhole covers have been searched carefully, but nothing was found. Therefore, Chen Ziqiang's disappearance is most likely still in this experimental building.

In fact, when Chen Yan entered this experimental building for the first time, he turned on the olfactory gene lock, but with little effect.

Chen Ziqiang had been missing for three days when Chen Yan arrived at the scene. The windows in the experimental building were always open, the side door and the front door were also open, and the air flow was very good. This was destined to leave traces even if Chen Ziqiang appeared in this building. It's also hard to spot.

What's more, the experimental building is not assigned to students of any specific major. The daily turnover of personnel is very high. Hundreds of thousands of students come in and out every day, and it is impossible to identify the traces left by Chen Ziqiang.

As for other smells, Chen Yan had actually discovered them. For example, in the toilet behind the hospital, Chen Yan discovered the smell of blood the first time he entered.

If there is this kind of smell in ordinary places, it definitely means there is something wrong, but this is the laboratory building of the Vocational and Technical College. The third floor is the chef's professional laboratory, or a large kitchen, where students process raw meat almost every day. , the smell of blood is normal.

In the lecture theater on the first floor, Chen Yan walked past the windows one by one, looking at each window very carefully.

The inspection by Li Yun's subordinates showed that there was no problem. Limit locks were installed in the middle of these windows, which limited the opening limit of the windows. They could be closed, but they could not be fully opened unless the limit locks were destroyed.

Chen Yan also carefully investigated some hidden corners, such as the space inside the podium, but nothing unusual happened.

On the day of the incident, no one was in class in the pastry laboratory on the second floor, but there were students in the kitchen on the third floor. If Chen Ziqiang was killed, it is unlikely that the murderer committed the crime on the third floor, so there is a high probability that it was on the first floor. Or the second floor.

After leaving the lecture theater on the first floor, Chen Yan checked the bathroom emphatically.

There was no blood, which was the most important evidence to determine whether there was murder.

Unless the murderer used some special method, there will definitely be evidence.

Regarding the elimination of blood stains, there are actually certain methods.

Of course, cleaning with water is not enough. In fact, the most important thing to test for blood stains is that blood contains iron ions. The content of iron ions is an important basis for judging the type of blood.

As long as the iron ions in the blood can be neutralized, the blood stains can be cleaned.

Ordinary water washing is definitely not possible. Iron ions are not soluble in water. Even if the surface looks clean, it can still be found after some technical means.

However, if you wipe with a liquid such as soapy water, as long as you do it carefully enough, it will be difficult to detect the remaining traces through current technical means.

Chen Yan is now observing carefully in the stalls of each bathroom.

ground……

There are no traces. The restrooms in the experimental building are cleaned every day, and the cleaning frequency is no less than twice.

In this case, even if the murderer left some traces at the time, it would be difficult to leave any clues these days.

All that was left were the marks on the wall and the bathroom partition. Chen Yan turned on the visual gene lock and scanned them one by one.

If the murderer really used some special means to clean up the bloodstains, although no bloodstains would be left, there would eventually be other traces, such as cleanliness.

In the bathrooms of university teaching buildings, the floors must be cleaned frequently, but what about the walls and bathroom partitions?

Maybe no one has ever cleaned it since the day it was built.

Therefore, if Chen Ziqiang was really murdered and the murderer had dealt with the crime scene, then the cleanliness of the partitions and walls must be different from that of other bathrooms.

The eyesight that opens the visual gene lock with statements can definitely be discovered.

The bathrooms in the laboratory building are all on the inner side of the building, that is, on the side near the unopened side door.

The men's and women's bathrooms are adjacent, and Chen Yan's inspection focused on the bathrooms on the first and second floors.

On the first floor, in the men's bathroom, Chen Yan was carefully inspecting a bathroom partition, comparing the cleanliness of the bathroom partitions he just looked at.

There is no difference, the same dust adheres to it, and there are no traces of cleaning.

Wearing gloves, Chen Yan gently tiptoed and touched the upper layer of the partition with his fingers. There were also traces of dust and no other residue.

Each bathroom has five partitions. Chen Yan checked them one by one and found no problems.

Chen Yan also carefully inspected the pastry laboratory on the second floor. It was obviously more complicated than the lecture theater on the first floor.

There are ovens, steamers, large chopping boards, etc., and there are many places to hide things.

With the help of school staff, Chen Yan did not miss any space: "Police officer, each of our laboratories is monitored, and all the materials here are also counted by dedicated personnel. It is impossible for Chen Ziqiang to hide in So many days here.”

"And Chen Ziqiang is a student majoring in beauty and hairdressing, so he can't get in here."

Chen Yan nodded. No abnormalities were found in the pastry laboratory or pastry room.

"Teacher, could you please arrange for someone to give me a copy of all the surveillance videos in the building on the day Chen Ziqiang disappeared?"

"That's no problem. I'll arrange for the Security Department to give you a copy. When do you want it to arrive?"

"Today, the surveillance video from Chen Ziqiang's disappearance to now."

"OK."

After that, Chen Yanyou checked the bathroom on the second floor. Like the first floor, there was nothing suspicious.

Chen Yan, who was in the big kitchen on the third floor, also checked it personally. The frozen meat in the refrigerator was all beef, pork and some chicken racks. There were no corpses as expected.

Therefore, the whole building is clean.

How did this Chen Ziqiang... disappear?