The problem is that because of the confidentiality regulations, the leader of the institute only said last night that it was a secondment from the task force, and did not say anything else, so everyone did not understand what the case was and what the situation of the secondment was.

But Wang Liang knows very well! He just went through the scene a few days ago, and there has been no notice of solving this case in the past two days. Thinking of the situation at the scene, Wang Liang didn't want to go, so he made a bet with Li Han, who had a good relationship.

Facts have proved that information asymmetry is unfair, so Li Han naturally lost, and Li Han really wanted to come to the task force to take a look, so it was Li Han who came.

Well, Wang Liang's level is high enough.

Too lazy to dismantle Wang Liang, Bai Song and Li Han chatted about something else.

Li Han is a person with deep patriotic feelings, mainly because he is very obsessed with the history of the Qin Dynasty to the Five Dynasties and Ten Kingdoms, and Bai Song happens to have a little research on the history of the Song Dynasty.

History is something that no one can underestimate, such as the "Collection of Grievances" written by Song Ci in the Southern Song Dynasty, although it is old and some places are not so scientific, but it is still worth learning. In his sophomore year, Bai Song took the ancient language and literature elective, which was the book he chose.

Among them, there is a record in Volume 4-25 of the "Collection of Records of Clearing Grievances": "If the skin and flesh under the item are convex, and the skin on both shoulders is shrugged, it is cut off before death; "In this case, it can be used to prove that the dismemberment was carried out after the victim's death.

After running outside for a day, Li Han and Bai Song found seven or eight shops with grinders, took samples of more than 20 grinders, had some dinner casually, and when they returned to the unit, it was already seven o'clock in the evening. Li Han didn't live in the unit, he drove home by himself, and Bai Song lived directly in the criminal police team.

After sampling more than 20 samples in one day, Bai Song was not optimistic, because he gradually felt that the composition of the more than 20 samples taken today would not be any different.

Back in the dormitory, Bai Song was surprised that Sun Jie was actually in the same dormitory with him, and he didn't leave.

"Brother Jie, why didn't you leave?" Bai Song glanced at Sun Jie, who was sorting out a lot of materials.

It doesn't matter if you look at it, Bai Song almost didn't pop his eyes out.

What Sun Jie is sorting out is a complete set of reports. The report here includes a large number of color live photos. And these photos .....

Bai Song just glanced at it, and he couldn't hold it anymore. The little thing he had just eaten instantly reached his throat, Bai Song forcibly pinched himself, pressed it down, and then turned his head and stopped looking at Sun Jie.

Sun Jie couldn't help laughing, looking at Bai Song, who was originally excited, looked at a few pictures and became like this, he couldn't help but tease: "What are you afraid of? It's not like you haven't seen the scene." ”

"Don't, Brother Sun, Brother Jie! I absolutely admire you for being amazing, my Taoism is too shallow, and I am willing to bow to the wind. ”

This is not the time to be reckless, Bai Song suddenly understood, why Wang Liang didn't want to come.

"It's okay, if you can't stand it, you will vomit it, this kind of thing, you will get used to it after vomiting a few times. When I was in school, the first time I met the general teacher, the students in my class couldn't help it. Now, it's just a normal heart. Sun Jie said indifferently, sorting out the case file as he spoke.

"It's okay, I'm much better. Bai Song took out his water cup from the backpack on the bed. Before he could drink a little tea in the morning, it was almost no temperature at this time, so he drank all 500ml of tea at once.

The bitter tea eliminated most of the nausea in his throat and eyes, and Bai Song understood that in this world, there are some things that you will definitely face once you choose.

Thinking of this, Bai Song looked at those photos again, although it was still extremely disgusting, but it was already much better.

"Okay, come over and help me finish the case file when it's better, I'm also a single dog, I won't go home tonight, finish all these things, and report to the leader tomorrow." Sun Jie said.

Bai Song said hello and helped Sun Jie. In fact, there is not much work, that is, binding, the two of them cooperated, and it was done in ten minutes, and during this period, Bai Song, who had seen several photos of various kinds, gradually began to get used to it.

"Brother Jie, I see that this incision is really smooth enough?" Bai Song asked with disgust.

"Well, you're right, I and a few comrades in the city have also seen this problem, we speculate that this cutting machine has a strong cutting ability, and the damage to the connection is relatively small, for this, we speculate that this should be a skilled worker. Sun Jie said.

"You mean, the murderer was a man who installed doors and windows?" Bai Song said.

"I don't rule it out. Sun Jie finished it and stretched: "I've been busy all day, I'm tired, I have to take a shower and sleep in a while, do you read this volume? If you look at it, you can take it, if you don't look at it, I'll lock it up." Because everyone is a task force, Sun Jie is not shy about it.

"Look, Brother Sun, you are busy first, I'll watch in this room, and I can't lose anything. ”

After speaking, Bai Song opened the case file.

This is not the whole case file, but only a case file made by the forensic doctor and the criminal police who investigated the scene, Bai Song tried to avoid those photos, but read some reports.

In the sand extracted on site, the composition is very complex, as river sand and silt have been mixed in. The laboratory of Tianhua University used a variety of experimental methods to prove that the amount of various elements in it did not match the river sand.

There are only inferences, not conclusions.

It is currently inferred that it contains silicon carbide.

Silicon carbide also exists in nature, that is, we often say that it can be compared with diamonds to fake real moissanite, but industrial low-purity silicon carbide is often prepared in abrasives.

According to this clue, silicon carbide is also called emery in industry, and there are special models in the definition of grinding wheels, called GC (green silicon carbide abrasives) or C (black silicon carbide abrasives), but there are still two problems. The first is that these two kinds of abrasives are the most commonly used abrasives, and the second is that the composition of several corundum abrasives was found in the experimental report, which made everyone have a headache.

Bai Song looked at the scroll for a long time, Sun Jie couldn't stand it, "Let's talk about it tomorrow, I'm not younger than you at this age, I can't stand it anymore, give me the scroll, I have to lock it up." ”

Sun Jie is still as meticulous as ever, he won't sleep if he doesn't put these things in the security cabinet, Bai Song naturally understands, so he handed over all the things, went to wash himself, prepared the futon, and lay down to rest.