Sun Xiuwen's two best friends, after being taken to the police station, still acted like they didn't care. Their boyfriends, on the other hand, looked like a scoundrel boy. This was not his first time at the police station, and he seemed to really not care.
The parents of several people were relatively sober. After saying good things, they were busy calling the legendary capable people, but with little effect.
Meng Chengbiao observed several people coldly, and it only took a short time to discover that one of the two seemingly carefree girls had a rather uneasy look in his eyes.
"Take all four people to the interrogation room." Meng Chengbiao determined the target and then said: "I will interrogate this Liu Mingxue first."
"Yes." Faced with this kind of case, the police at the police station can only cooperate. Their own interrogation rooms have to be vacant.
At the same time, Jiang Yuan asked someone to open the unused courtyard door on the hillside.
This house belonged to the uncle of Liu Mingxue's boyfriend Sun Jianyu. The latter worked outside and rarely came back once a year. He left the house to Sun Jianyu's parents to take care of it. Sun Jianyu secretly assigned the key and occasionally sneaked in to watch TV.
Several friends knew about it and gathered here one after another, forming a secret base.
There were not many people living in the village for a long time, and the location of this house was slightly off. A few people pulled up the heavy curtains in the room and clamped them up with clips. From the outside, it was completely light-tight.
.
This house has made Sun Jianyu and others happy for a long time.
From the entrance, you can see traces of their happy life. Among the garbage discarded in the yard, there are still food that has not rotted, but the few flowers raised in the yard are basically dead.
Jiang Yuan was dressed neatly at the door. After entering the yard, the survey process started.
For Jiang Yuan today, this means two security personnel opening the way, four on-site investigation technicians following, one criminal photography technician who specializes in placing tags and taking pictures, and one video recording of the entire process to accumulate evidence, complete the evidence chain, and facilitate
Photographers who passed the death penalty review.
With 9 people moving in, there is still a certain amount of pressure in a house like this.
Jiang Yuan made a quick observation and arranged personnel to conduct inspections layer by layer to disperse the personnel and speed up the process.
After finishing the arrangements downstairs, Jiang Yuan went to the bedroom upstairs again.
This is the real secret base, and it is also the place most likely to be the first scene. Jiang Yuan originally planned to investigate it in slices from head to toe, but when he came in and took a look, the LV5 crime scene investigation was completed.
Let him focus on a pillow beside the bed.
There is no quilt on the bed in this bedroom, and the sheets are messy and dirty, as are the two pillows next to them, which have become a little yellowed from years of use.
Only the pillow next to the door was white and had obviously been washed.
Jiang Yuan sighed secretly, walked over with a horseshoe mirror, picked up the pillow, and studied it silently.
When a person is suffocated, some liquid will often flow out of the mouth, which is usually not blood, so spraying luminol is of no use. After the pillow is washed, the possibility of it remaining is even lower.
However, pillow cores are difficult to clean, especially for young people who are not good at washing clothes. If they just use washing powder or laundry detergent to soak and rub, there may still be residues in the pillow core.
Jiang Yuan first waved people over to take pictures, then picked up the pillow with gloves and looked at it. No obvious stains were seen. Then he put it into the evidence bag and handed it to the person behind him, saying: "The evidence that has been obtained,
Send it to the Criminal Investigation Center for examination first."
This would be unthinkable for ordinary criminal police teams. Not to mention that the evidence is taken away alone, and everyone has to sit together. The evidence is sent to the criminal department center, let alone tested immediately. The criminal department center is always super busy.
Overloaded with work, leaders are unwilling to increase huge investments unless they have to. Therefore, most of the evidence has to be scheduled.
That is to say, the homicide task force and the leader of the special task force may have some privileges. Of course, Jiang Yuan's privileges are wider. Even the Criminal Investigation Center in the capital dare not delay the evidence he sent.
After taking away the pillow, Jiang Yuan checked the sheets, mattress, mattress, etc., and sure enough found a little suspected secretion on the sheets.
Jiang Yuan still asked people to take pictures first, and then used scissors to cut off the part of the bed sheet that contained secretions.
This may seem like destroying evidence, but in fact, this is truly standard practice.
On the other hand, some young criminal police officers are either lazy or ignorant and will pack the entire bed sheet back. Usually after being scolded a few times, they get used to it.
Not only is it a waste of space to pack the whole sheet back, it's also useless for testing.
When a large group of sheets is handed over to the technicians at the Criminal Investigation Center, they don’t know which part to inspect. Even if they check again, they may make a mistake in their judgment.
On the other hand, there is no real detection instrument that can produce results with just a "beep". Whether it is a liquid phase or gas phase mass spectrometer, or any other instrument, the most common method is to take a piece of the instrument and test it.
Material - For sheets, cut a piece and put it into the machine for analysis.
Therefore, when a criminal investigator presents a complete sheet or towel, he either only took part of the fibers and did a partial test, or he took the wrong evidence.
The remaining sheets were collected by Jiang Yuan. Although this part is also evidence, there is no rush to test it. If necessary, it can be retrieved later.
Immediately afterwards, Jiang Yuan cut off part of the mattress fabric at the head of the bed. This part did not even need to be gathered up, otherwise the police evidence room would not be enough.
After all these tasks were completed, Jiang Yuan felt a little more relaxed and began to inspect the room again.
The bedroom used by a few teenagers as a secret base was clean and tidy. There were all kinds of messy objects everywhere, and the hygiene made the investigators frown. To a certain extent, this could be regarded as a way to hide evidence.
Buzzing…
The phone in my pocket vibrated.
Jiang Yuan frowned, took off his gloves, and took out his mobile phone: "Hey, Lao Meng."
"Team Jiang, the victim Sun Xiuwen's best friend Liu Mingxue, and Liu Mingxue's boyfriend Sun Jianyu have all confessed." Meng Chengbiao said this first, and then said: "Liu Mingxue made an appointment with Sun Xiuwen that day.
Relatives made an appointment to make a video call, so they didn't come out. The three of them had a party and drank at Sun Jianyu's uncle's house. During the period, they talked about cleaning up the house and waited for relatives to come to the house. There was a dispute. Liu Mingxue said that Sun Jianyu got drunk because of drinking and covered Sun Jianyu to death.
Xiuwen."
Jiang Yuan nodded: "What did Sun Jianyu say?"
"Sun Jianyu said that Liu Mingxue went up and strangled Sun Xiuwen's neck first, and he covered her with a pillow out of help."
Jiang Yuan breathed a sigh of relief. In this case, the murderer was limited to two people. It was just a matter of Sun Jianyu killing alone, or whether the two were master and accomplice respectively, or whether they were master or slave.
After Meng Chengbiao finished speaking, he felt more relaxed: "There was no third person at the scene. In this case, we may have to carefully distinguish the testimonies of the two people. However, there should be no problem that the murderers were Liu Mingxue and Sun Jianyu or one of them."
of."
"Where are the jeans?" Sun Xiuwen climbed down from the second floor through the jeans tied together. Sun Xiuwen didn't go back, so how did the jeans go back?
Meng Chengbiao coughed twice, sighed again, and said: "Sun Jianyu claimed to have climbed in at night, put on gloves, put away his jeans, and jumped off the second floor."
"Jump down?" Jiang Yuan recalled the traces downstairs and couldn't help but shake his head. It rained that night, just like the motorcycle traces in the wild, they were basically washed away by the water and could not be seen clearly. On the wall
It's not surprising that some of the tracks were damaged.
Meng Chengbiao just assumed that Jiang Yuan was doubting about jumping off the building, and said: "This Sun Jianyu is in good health, with a good figure and a good figure, especially his body is relatively thin. He has filmed some fast parkour scenes. In terms of flexibility, he is more flexible than ordinary people."
People are much stronger, so they should be able to jump off buildings without getting hurt."
"The body is relatively thin. How thin is it?" Jiang Yuan paused and asked: "Can you kill Sun Xiuwen independently?"
