Chapter 1042

After Sun Xiuwen's two best friends were brought to the police station, they still looked indifferent. Their boyfriends were a type of ruffian teenager, and it wasn't their first time in the police station, and they didn't seem to care at all.

The parents of several people were relatively sober. After saying some nice words, they were busy contacting the legendary capable people, but the effect was minimal.

Meng Chengbiao observed several people coldly, and it only took a very short time to find that among the two girls who looked big and big, one had eyes that were quite uneasy.

"Bring all four people to the interrogation room." Meng Chengbiao determined the target and said: "I will interrogate this Liu Mingxue first."

"Yes." The police officers of the police station faced such a case and could only cooperate. Their own interrogation rooms had to be vacated.

At the same time. Jiang Yuan asked people to open the idle courtyard gate on the hillside.

This house belongs to the uncle of Liu Mingxue's boyfriend Sun Jianyu. The latter works outside and doesn't see him come back once a year. He handed the house to Sun Jianyu's parents to take care of, and Sun Jianyu secretly matched the key and occasionally slipped in to watch TV.

Several little friends knew about it and gathered here one after another, thus forming a secret base.

There are not many people living in the village, and the location of this house is slightly biased. Several people pulled the heavy curtains of the room and clamped them with clips. Looking from the outside, it is completely opaque.

This building made Sun Jianyu and others happy for a long time.

From the position of entering the door, you can see the traces of their happy life. Among the garbage discarded in the courtyard, there is food that has not yet rotted, but the few flowers raised in the courtyard have basically withered.

Jiang Yuan was dressed neatly at the door, and after entering the courtyard, it was the survey process.

For Jiang Yuan today, this means two security personnel opening the way, four on-site survey technicians following, one criminal photography technician specifically for placing labels and taking pictures, and one photography personnel recording the whole process to accumulate evidence, improve the evidence chain, and facilitate the death penalty review.

9 people entered, which still had a certain pressure for such a house.

Jiang Yuan observed quickly, and then arranged personnel to survey layer by layer to disperse personnel and speed up.

The arrangements downstairs were finished, and Jiang Yuan came to the bedroom upstairs again.

This is the real secret base, and it is also the place most likely to become the first scene. Jiang Yuan originally planned to survey it from head to toe, but after taking a look, the LV5 crime scene survey made him focus on a pillow at the head of the bed.

There is no quilt on the bed in this bedroom, the sheets are also messy and dirty, and the two pillows next to them are also yellowish due to years of use.

Only one pillow near the door is white, obviously washed.

Jiang Yuan sighed secretly, took a horseshoe mirror and walked over, picked up the pillow, and studied it silently.

When people are smothered to death, liquid often flows out of their mouths, which usually won't be blood, so spraying luminol is useless. After the pillow is washed, the possibility of residue is even lower.

However, the pillow core is very difficult to wash clean, especially for young people who are not very good at washing clothes. If they only use washing powder or laundry detergent to soak and rub, it is still possible to have residues in the pillow core.

Jiang Yuan first asked people to come over to take pictures, then picked up the pillow with gloves and looked at it. He didn't see obvious stains, so he put it into an evidence bag, handed it to the person behind, and said: "The evidence already obtained, send it to the Criminal Science Center for inspection first."

This is something that the general criminal police team can't even think about. Let alone the evidence going separately, people have to squeeze to sit. Sending evidence to the Criminal Science Center is even more impossible to say immediate inspection. The Criminal Science Center is always overloaded with work, because unless it is a last resort, leaders are unwilling to increase huge investments. Therefore, most of the evidence has to be scheduled.

In other words, the homicide special task force, and the leader's special task force, might have a little privilege. Of course, Jiang Yuan's privilege is more extensive. The evidence he sent over, even the Beijing Criminal Science Center dare not delay.

After taking the pillow, Jiang Yuan also checked the sheets, mattresses, etc., and sure enough, found a bit of suspected secretion on the sheets.

Jiang Yuan still asked people to take pictures first, and then cut off a part of the sheet containing secretions with scissors on the spot.

This looks like destroying evidence, but in fact, this is the truly standard practice.

There are some young criminal police who are lazy or don't understand, and will pack the whole sheet back. Usually, after being scolded a few times, they get used to it.

This is not only because packing the whole sheet back wastes space, but also because it is useless for testing.

A large group of sheets, handed to the technicians of the Criminal Science Center, they don't know which part to check. Even if they re-check it once, they may judge it wrongly.

On the other hand, the real testing instrument does not exist in the matter of "beep" and the result comes out. Whether it is liquid chromatography or gas mass spectrometry, or some other instrument, the most common practice is to take a piece of test material—for sheets, that is, cut a piece off and stuff it into the machine for analysis.

Therefore, when a criminal investigation personnel presents a complete sheet or towel, they either only took part of the fibers and did partial testing, or they took the wrong evidence.

The remaining sheets were also collected by Jiang Yuan. Although this part is also evidence, it is not urgent to do testing. If there is a need later, it can be taken and used.

Immediately after, Jiang Yuan also cut part of the mattress cloth at the head of the bed. This part doesn't even need to be collected, otherwise, the police evidence room won't be enough.

All this work was completed, Jiang Yuan felt a little relaxed, and then inspected the room.

Several teenagers used the bedroom as a secret base. Cleanliness and tidiness are out of the question. All kinds of messy objects are everywhere, and hygiene also makes the survey personnel frown. From a certain point of view, this can also be considered a way to hide evidence.

Buzz buzz...

The phone in his pocket vibrated.

Jiang Yuan frowned, took off his gloves, and took out his phone: "Hello, Old Meng."

"Captain Jiang, Sun Xiuwen's best friend Liu Mingxue and Liu Mingxue's boyfriend Sun Jianyu have all confessed." Meng Chengbiao said this first, then said: "Liu Mingxue made an appointment with Sun Xiuwen to come out to play that day. Because Sun Xiuwen's boyfriend's family made an appointment with overseas relatives for a video call, he didn't come out. The three gathered to drink at Sun Jianyu's uncle's house. During the period, they talked about cleaning the house and waiting for relatives to visit, which led to a dispute. Liu Mingxue said that Sun Jianyu was drunk and smothered Sun Xiuwen to death."

Jiang Yuan nodded: "What did Sun Jianyu say?"

"Sun Jianyu said that Liu Mingxue grabbed Sun Xiuwen's neck first, and he helped out, so he used a pillow to smother her."

Jiang Yuan breathed a sigh of relief. In this way, the killer was limited to between the two, regardless of whether Sun Jianyu killed alone, or whether the two were accomplices, or whether they didn't distinguish between primary and secondary.

Meng Chengbiao felt very relaxed after saying it: "There is no third person at the scene. In this way, we may have to carefully distinguish the testimonies of the two. However, the killer is Liu Mingxue and Sun Jianyu, or one of them, should be no problem."

"What about the jeans?" Sun Xiuwen climbed down from the second floor through jeans tied together. Sun Xiuwen didn't go back, how did the jeans go back?

Meng Chengbiao coughed twice, sighed again, and said: "Sun Jianyu claimed to climb in at night, wearing gloves, collected the jeans, and jumped down from the second floor."

"Jumped down?" Jiang Yuan recalled the traces downstairs, and couldn't help shaking his head. There was rain that night, just like the motorcycle traces in the wild, basically washed away by the water, so it was not strange that some footprints on the wall were damaged.

Meng Chengbiao only thought Jiang Yuan was doubting the jumping building, so he said: "This Sun Jianyu has a good body, good figure, especially the body is relatively thin. He has taken some parkour clips on Kuaishou, and his flexibility is much stronger than ordinary people. He should be able to jump off the building without injury."

"The body is relatively thin, thin to what extent?" Jiang Yuan paused and asked: "Can he independently smother Sun Xiuwen to death?"