"Let's do it." Shao Lao nodded.

Everyone looked at each other, not knowing what to do.

At this time, a technician came over and said, "We found a fingerprint with a clear thumb on the cabinet just now. Now we are going to go back and compare to see if this person has a criminal record."

Old Shao's eyes lit up: "Only found one?"

The technician nodded.

"Go." Shao Lao said.

When people touch things, they are bound to leave fingerprints, and on different materials, fingerprints exist for different times. For example, if a person touches another person's skin with their fingers, such fingerprint collection is very difficult, and if the person touches plastic or metal with their fingers, fingerprint collection is easier.

This is because the fingerprints left by people on objects are composed of sweat, cholesterol, oils, proteins and amino acids, which are difficult to clearly collect from human skin. Even on the rest of the objects, the fingerprints disappear after too long.

But before the fingerprint disappears, we can use chemical methods to identify the proportion of chemical substances in the fingerprint to know how long the fingerprint has existed. On this metal cabinet, it is normal for fingerprints to exist for a week. If you can know when the fingerprints were left, you can know if it is related to the case.

And this fingerprint is likely to be left by the murderer.

This is a big clue, but Jiang He doesn't think so.

Jiang He asked, "Are there any fingerprints on the plush toys and soccer balls?"

The technical staff said: "I found it, but the fingerprints on it are too messy, that is to say, there are many people's fingerprints and many overlapping fingerprints. This kind of fingerprint collection is meaningless, because there are too many overlapping parts, we have no way to rely on it. Part of the fingerprints found this person. But this time is different, this is a clear and complete fingerprint, and, if not the murderer, who else would have left this fingerprint?"

"Aren't Captain Li's fingerprints left?" Jiang He asked.

The technical staff shrugged: "Of course, are you a police officer the day before? Since we can confirm that it is Captain Li's fingerprint, it is an invalid fingerprint, and it has nothing to do with the case. What do we collect it for..."

"Is there no overlap?" Jiang He asked again.

Jiang He's attitude of breaking the casserole and asking to the end was really annoying, but the technical staff also knew that these people belonged to Shao Lao, and Shao Lao was famous for being strange before. How strange.

The technical staff was a little helpless: "There is no overlap. This fingerprint was found on the upper end of the cabinet, while Captain Li's fingerprints were concentrated on the lock of the cabinet. That is to say, if this fingerprint was not left by the deceased, Then it is most likely left by the murderer."

"Show me." Jiang He said.

The technical staff took Jiang He to a cabinet. This was not the locker that contained the corpse, but the locker to the left of the corpse. This locker contained some specimens made from formalin. is open. The technician closed the door and pointed to a spot roughly on the edge of the locker's height.

Jiang He looked at this place, the height was about one meter seven or eight.

Jiang He stretched out his fingers and compared the fingerprints back and forth. He tried five fingers on his left hand and five fingers on his right. To others, Jiang He seemed to be dancing square dancing in front of the cabinet. From time to time he cocked his ass, sometimes stood on tiptoe, and sometimes put his hands on his hips, looking very funny.

Captain Li and some detectives looked at Jiang He and couldn't help but laugh in their hearts, but Elder Shao understood what Jiang He was doing.

At this moment, Jiang He is simulating the crime scene, which is a very advanced investigation method. Only through personal simulation can we understand what the murderer is doing and why he does it, which is very helpful for bringing the murderer into the murder scene.

Thinking of this, Shao Lao couldn't help but think of one of his team members 20 years ago, who was a genius who didn't need a crime simulation, but unfortunately...

Shao Lao shook his head and put all these old events behind him, but asked, "Jiang He, what is the result of the simulation?"

Jiang He ignored Mr. Shao, and after he made a few more moves, he started to say, "I just simulated from the perspective of the murderer and the deceased, but I still can't make a high-probability guess, I have no way to know. , under what circumstances, these people will make the action of leaving fingerprints in this place, we still need more information."

"However." Jiang He walked to the door: "After seeing the scene, I have a 60% probability that the basic killing process is like this."

Saying that, Jiang He pulled Xu Yiman over and made Xu Yiman the victim and Jiang He the murderer.

The simulation starts:

Xu Yiman pushed open the door of the utility room and walked in. Without looking back, she walked all the way to the location where Jiang He had marked the deceased under attack. The location was one meter away from the locker. At this time, Jiang He called Xu Yiman's name. Xu Yiman turned his head from the right side to look at the door on the right side, and at this moment, Jiang He waved in the air and smashed his hand on Xu Yiman's head.

Jiang He used his strength this time. Although he wouldn't hurt Xu Yiman, it still hurt. Xu Yiman naturally didn't think that Jiang He would come with him, so he involuntarily leaned forward under the pain. Fortunately, a criminal policeman next to him was quick-witted, and only then did he hold Xu Yiman.

Xu Yiman looked at Jiang He angrily: "You're crazy!"

But Jiang He didn't pay any attention to Xu Yiman, he looked up at the blood on the ceiling.

Jiang He snapped his fingers, seemingly ignoring Xu Yiman's pain: "That's it! This utility room is on the dark side and the door is on the right side. When the deceased came in, he went straight to where Xu Yiman was standing. , At this time, he heard movement from the door, so he looked back from the right side."

"At this time, the murderer hit the deceased's forehead with a blunt weapon, and blood spurted out of the deceased's head. The blood spurted out and sprayed toward the door, so we saw blood sprayed on the right wall and On the ground. What's more, because of the blow, the deceased leaned forward, and the wound on the upper right side made him lean forward, the higher the blood spurted, so we saw blood on the ceiling."

Xu Yiman rubbed his head and said, "Can you tell me next time? Do you know that it almost hurt me?"

Jiang He shook his head: "If I told you beforehand, you would subconsciously react to dodge or raise your arms to block. And I saw no signs of breaking the arms of the corpse, which means that the deceased is just like you. It was hit very suddenly."

Shao Lao nodded: "That is to say, the deceased probably thought that there was no one in the room when he came in, or the deceased thought that this person could not kill."

Jiang He nodded and said, "I have a 70% chance of thinking it's the former."

As he spoke, Jiang He added: "And you look at the ground, we all came in wearing boots, so there are no footprints of ours on the ground, but not only our footprints, but also the footprints of others. But the blood on the ground makes us I know that the murderer did not deal with the traces on the ground. It has been raining these days, so I think that the deceased must have come before it rained, otherwise, there will be footprints. "

"And." Jiang He looked at the corpse and said seriously, "I have a 70% probability that he came at night. First, he didn't find the murderer. Second, there must be a lot of blood on the murderer's clothes. During the day, a lot of people will find it on the street."

The more Jiang He said, the more excited he became: "But we know that it rained on the night of August 9, and considering the time of death of the deceased, it was about four to five days, that is to say, the night of August 8 was the most likely time. !"

"Right?" Jiang He looked at Xu Yiman and couldn't see that Xu Yiman was angry with him.

Xu Yiman didn't have a good face: "Yes, the time of death of the deceased was on the night of August 8th, which is consistent with the autopsy results, but the specific time can only be known through an autopsy."

"I have an 80% probability that the time of death of the deceased is on August 8th." Jiang He said.

"Then who made that call." At this time, a weak voice came from the side, it was Captain Li's voice: "According to Song You's mobile phone, the last call was from Zhuang Ziming, and The time is 11:10 noon on August 9th, but if Zhuang Ziming died on the night of August 8th, then the phone…”

Shao Lao and Jiang He answered almost at the same time, "Murderer!"

Shao Lao suddenly became a little anxious. He said, "On our way here, you have already found the body and checked the house. Have you found Zhuang Ziming's mobile phone?"

Captain Li shook his head and said, "We almost turned the house over, but we still haven't found Zhuang Ziming's mobile phone, but we have been monitoring Zhuang Ziming's mobile phone, and now we haven't found that Zhuang Ziming's mobile phone is turned on. , so there is no way to find where the phone is."

Shao Lao's hands clasped together and kept rubbing, and he began to slowly pace the room. Shao Lao's brows were furrowed together, and his mouth was tightly pursed. From Shao Lao's eyes, everyone saw a trace of doubt and anxiety. And everyone still didn't understand what Shao Lao was worried about.

About a minute or so, Lao Shao's left hand was a palm and his right was a fist, and they slammed together: "It's broken, Zhuang Ziming's phone will never be turned on again, and we haven't even found all of Song You's phone. Limbs, and Song You also has a mobile phone, have you monitored Song You's mobile phone?"

Having said this, Captain Li's face turned pale, and he said, "This, we really don't have this!"

Shao Lao said quickly: "This is basically a trick to turn the tiger away from the mountain. If it's broken, we should notify the news of Song You's death! The murderer knew about this utility room, and he must know the No. 4 Middle School very well, and this person is eight to nine out of ten. Knowing Zhuang Ziming and Song You, then the body in this locker must belong to Zhuang Ziming."

"Only the murderer knows that Zhuang Ziming and Song You are dead, and the rest of the classmates don't know it at all. The murderer is probably looking for the next target!"