Chapter 789

When Jiang Yuan and Miao Ruixiang arrived at the scene, the people from the Criminal Science Center had almost arrived as well.

Niu Tong, the forensic doctor from Qianjin District, was also called over, with a short and sturdy body and eyes that were a bit unable to open.

"Team Leader Jiang arrived first." Niu Tong was yawning from exhaustion and hurriedly said: "Sorry, I've been collecting physical evidence everywhere since I started catching these threesome prostitutes."

A piece of forensic knowledge: biological evidence related to the human body is forensic physical evidence. That is to say, when a piece of toilet paper is white and tender, it is general physical evidence, but if it is stained with human tissue, whether it is nasal mucus, blood, milk, saliva, or anything else, it instantly becomes forensic physical evidence, which also becomes the field that Niu Tong is good at.

Jiang Yuan smiled and nodded at Niu Tong, saying: "I was originally looking at the corpses, but I was called over. Let's go in first."

"Okay, you first, you first..." Niu Tong had already worked on many cases with Jiang Yuan, and he could be considered familiar with Jiang Yuan.

Several people filed in.

The scene was an ordinary apartment of about 80 square meters, with two bedrooms and one living room, which was kept quite tidy.

The suspect had his hands behind his back and was handcuffed on the sofa. His two arms had fine muscle lines, which were very beautiful, but his face was too square, his skin was rough, his expression was arrogant, and his demeanor was slightly manic.

Thump.

A criminal police officer moved out a courier box, placed it in the center of the living room, and said: "All condoms, one brand."

"You really won't get tired of buying so many of one brand." Lei Xin intended to stimulate him to speak.

The suspect had a little anti-reconnaissance experience and found that the situation was not quite right, but he was still full of hope and said indifferently: "Do you also care about how many condoms I use?"

"Zhu Tianwei, do you have a girlfriend?" Lei Xin asked.

The suspect Zhu Tianwei was stunned for a moment and said: "Is that any of your business?"

Lei Xin curled his lips and said: "You brought your own condoms to prostitute, right?"

Upon hearing the word "prostitution," the suspect's complexion visibly improved, and his voice grew louder: "You are too nosy. You say I'm prostituting? Do you have evidence? You just broke into my house."

Lei Xin then looked at Wu Wu Fa Yi Niu.

He wanted to conduct a surprise interrogation of the suspect. The physical evidence at the scene of this case was severely destroyed, and there was no DNA or fingerprints that could directly lock onto the killer. At this time, obtaining the suspect's confession was very important. Equally important was collecting evidence through the suspect's confession.

There are many ways and methods for surprise interrogation. Some people like a thunderous strike, taking advantage of the suspect's recent arrest and the time when their mind is uneasy to obtain as many confessions as possible.

Of course, one can also ask questions in a progressive and targeted manner like Lei Xin, first confirming the suspect's criminal facts, even if it is criminal behavior in other fields, thereby expanding the results step by step.

Wu Wu Fa Yi Niu received Lei Xin's eye signal and immediately stepped forward to look at the courier box moved out by the criminal police.

Just one glance, and Niu Tong laughed: "The brand you bought is a small one."

"What's wrong with a small brand? It's fine as long as I masturbate comfortably." Zhu Tianwei was a little unhappy.

Niu Tong laughed, took out a box of condoms with gloves on, looked at the ingredient list on the back, and said: "The production environment of this model you bought is unstable, and the production line is shared with other models. Therefore, the lubricant used in each batch has slight differences. It is related to the cleaning done by the workers, the shared model type, and the quality of the raw materials in this batch."

Zhu Tianwei frowned as he listened.

Niu Tong laughed and said: "In short, if I take this condom of yours and compare it with the condom you used at the scene, I can prove that it is the same batch of condoms..."

"So what? I just prostituted, so what?" Zhu Tianwei didn't care about the 15-day administrative detention at all.

Niu Tong's proud expression couldn't help but stagnate. Yes, the person has already admitted to prostitution, so what is the use of my high-cost proof process that costs several thousand yuan?

Niu Tong's mood became depressed, and he was actually a bit broken.

"Where did the money come from?" Lei Xin spoke, quickly suppressing Zhu Tianwei's arrogant mood.

The muscles in Zhu Tianwei's two arms swelled for a moment, then softened again. He pursed his lips and remained silent.

"Don't think that if you don't open your mouth, we won't find it. Fencing stolen goods will have channels for fencing, and there will be people who receive stolen goods. Money has a route."

"There are many places where we can get cash now. As long as we check, we will always be able to find it. But if you save us some time, we can also make you feel more relaxed."

Lei Xin continued to apply pressure, and what he said was the truth.

The biggest fear of criminal investigation in China is not finding people, and the biggest fear is not knowing who did it. As for the matter of finding evidence after finding people, China neither has the fruit of the poisonous tree nor strictly emphasizes procedural justice. It is not even easy to exclude evidence.

In short, China's judicial system pays more attention to the facts, including the presiding judge of the court. When asking questions, most of the purpose is also to clarify the facts.

Lei Xin's purpose of surprise interrogation now is also to find more evidence.

Proving prostitution, and even having the hardware store owner testify against the killer, these belong to indirect evidence. Indirect evidence is not enough to sentence someone to death. It will be sent back when submitted for inspection.

Shen Yaowei from the cold case task force, who had been paying attention to this side, felt his nerves tremble violently the moment he saw Zhu Tianwei's muscles, but it was not fear, but suddenly thinking of a legend he had heard in the past two days.

Shen Yaowei's cousin was from the Public Security Detachment of Changyang City, and there were many sources of information. Looking at Zhu Tianwei on the sofa, Shen Yaowei looked left and right, and whispered in the ear of Liu Wenkai, whom he liked: "I heard them say that this guy has a rumor, do you know?"

"What rumor?" Liu Wenkai put down his phone.

Shen Yaowei used an even lower voice and said: "It is said that this guy is immensely strong. Once, he let a woman lie on the bed, then picked up a woman on top, and output alternately for 10 minutes."

Liu Wenkai's tongue went stiff as he listened: "Held for 10 minutes?"

"The woman didn't want to stack arhats and wanted more money, so he just picked her up." Shen Yaowei paused and said: "Don't say, a rich porter is really quite happy."

Liu Wenkai imagined it and nodded slowly: "However... if you really give a porter a good father, he will have to be carried by others in three years at most."

"Three years is worth it." Shen Yaowei said, pounding his waist: "We haven't done anything in the past three years, just catching thieves."

Liu Wenkai smiled contemptuously.

Lei Xin interrogated on the spot and let the technicians of the Criminal Science Team start working, thereby continuing to increase the pressure on Zhu Tianwei.

Jiang Yuan put on his gloves, headgear, and foot covers, and asked someone to move the box of condoms in the living room down, and then he began to search.

The first thing he searched for was the shoes at the door. After looking at the soles and inside of the shoes, he found nothing, so he went to turn over the dirty clothes in the washing machine.

Liu Wenkai had been the de facto leader of the major case team for many years. He understood at a glance and went over to ask Jiang Yuan: "Do you want to find the clothes and shoes used in the crime? They should have been discarded, right? Even if this guy is quite frugal, he has graduated from the university of society after all."

The two stayed in the bathroom and closed the door, so the suspect outside couldn't hear their conversation.

"Not really. I just looked at his criminal record. He was released after less than half a year of detention, and he only had 7 days for administrative punishment. At most, he can be considered a graduate of the junior college of the university of society." Jiang Yuan said while looking for things.

Liu Wenkai was amused: "Is there academic discrimination in the university of society? However, even if he is a junior college graduate, he can't possibly bring the bloody clothes back."

"I looked at his academic record when he was studying. I feel that he is not a meticulous personality who takes care of everything. Using a lot of salt and detergent at the crime scene should also be a temporary wit."

"I agree with this. If he could know what was in the other party's house, he shouldn't have broken in when all three people were there." Liu Wenkai said.

"Therefore, regarding the bloody clothes, I guess he shouldn't have brought his own clothes. It is very likely that he changed clothes in the victim's house, and it is very likely that he also changed shoes." Jiang Yuan's answer stunned Liu Wenkai.

Jiang Yuan continued: "Although the scene was severely destroyed, the blood loss of the three people was still very large. At that time, there should have been a lot of blood splattered on the killer. Therefore, before going out, he should have changed his clothes and shoes, otherwise, he would have left traces outside the door."

"No shower, just change clothes?"

"Maybe he was afraid of leaving hair. I guess he has heard of similar cases." Jiang Yuan expressed a little regret. There are many cases where the killer takes a shower in the victim's house. Some who handle it carefully are fine, but some people are arrested because hair is left in places like floor drains. The killer of the logistics company employee case that Jiang Yuan once worked on might have been fine, but because he encountered Jiang Yuan's LV4 crime scene investigation, he also got into trouble.

In short, for the police, the bathroom at the crime scene must be carefully investigated. More and more criminals are arrested because of this, and the experience of predecessors is naturally spreading wider and wider.

Jiang Yuan changed the subject and continued: "Although I don't know how the criminal handled the bloody clothes and shoes at the scene, there are still bloodstains in the clothes and shoes he changed. Especially the shoes, the blood remaining on his body is very likely to flow down. If it is a current case, if we grab him before he has time to handle these clothes, maybe we can lock onto him directly!"

Liu Wenkai was stunned again, then smiled helplessly: "I thought..."

If another technician said this, Liu Wenkai would have lost his temper, but Jiang Yuan's words...

Then he heard Jiang Yuan: "However..."

"En?"

"When I was looking at the clothes and shoes just now, I suddenly found that some of the suspect's clothes are very cheap work clothes, but some clothes, especially shoes, are actually quite good, basically all brand-name goods. Anta, Nike, Adidas, not limited editions, but none of them are Putian goods."

Liu Wenkai frowned: "Does this mean the suspect's actual living standard exceeds that of an ordinary porter?"

Jiang Yuan circled his fingers and said: "For a house like this, I also have many for rent. An apartment building of more than 80 square meters with convenient transportation costs at least 2000 yuan a month in rent. Zhu Tianwei is a porter and is paid by the piece. Most of the time, he only earns three or four thousand a month. Where does he get the money to buy brand-name clothes if he rents such an expensive house and has to eat and drink?"

"Does he have other sources of income?"

"It is very likely. The profession of porter is very convenient for home-invasion crimes."