Sun Yu's surprised voice instantly attracted the attention of Meng Yuan and Xia Lan. They had all seen the photos of the crime scene, at least they found nothing unusual.

Xia Lan sat up straight and looked at the photo in Sun Yu's hand. Meng Yuan pressed on Sun Yu's shoulder and lowered his head to check, for fear of missing something.

It was a screenshot from the police's law enforcement recorder, a photo of the deceased Liu Dezhu after he was recovered.

Liu Dezhu's death was the worst, covered in feces. Xia Lan would feel nauseated every time she saw these photos. She felt that this was even more disgusting than the scene of the mutilation case.

Seeing Sun Yu holding the photo without saying anything, the impatient Meng Yuan asked directly: "Brother Yu, is there any problem?"

Sun Yu glanced at Meng Yuan with a disappointed look on his face, "To be honest, I have quite high expectations for you, especially in terms of traditional criminal investigation. Didn't you find out that this photo has such a big problem?"

Xia Lan secretly put her slender fingers on Sun Yu's thigh and pinched Sun Yu hard.

Regardless of whether Sun Yu was criticizing Meng Yuan, Xia Lan could tell that Sun Yu was referring to Sang and scolding Huai. She had been following Sun Yu for so long, and Sun Yu had always stressed the importance of observation, so it was obvious that he was criticizing her observation skills.

Meng Yuan nodded humbly, looked at the photo carefully for a while, bit his lip with a look of embarrassment, "Is there any problem?"

"Let me ask you, if you wanted to push a person into a latrine, when would you do it?" Sun Yu asked.

"He must have taken off his pants..." Meng Yuan said in a long voice and was stunned. He looked at the photo again and realized that Liu Dezhu was wearing pants, a belt, and even the zipper between his legs.

Didn't even pull it apart.

Sun Yu added: "Even if Liu Dezhu accidentally stepped on the tampered stone slab, he would only have stepped on the stone slab during the process of excretion.

If you think about it carefully, even if there is a stone slab in the toilet, would you still have some grudges about the load-bearing capacity of the stone slab under normal circumstances? Would you be able to step on it without any problems? "

No! Most people don’t.

It's like a deep well covered with a stone slab. Even though you know it can withstand your gravity, you will never step on it out of caution for danger.

Sun Yu clicked his tongue and said: "Liu Dezhu drowned in the latrine, so everyone instinctively thought that he accidentally drowned while going to the toilet. Xia Lan also suspected that someone secretly came to Liu Dezhu's house.

But you also found surveillance cameras at the entrance of the alley. The surveillance cameras proved that no one entered or left Liu Dezhu's home before and after the incident, but you always thought it was murder, so you have been struggling with how the murderer bypassed the surveillance cameras.

Have you ever thought that in the three murder cases, because surveillance or witnesses proved that the murderer could not enter the crime scene, this has become your obsession, and have you never thought about thinking about the problem outside of it? "

Meng Yuan and Xia Lan looked at each other. They both felt that what Sun Yu said made sense. They had indeed been wondering whether the murderer had bypassed surveillance or witnesses.

Sun Yu further explained: "Surveillance will not lie. In other words, the murderer has been using surveillance or witnesses to prove that the deaths of these people were accidents. If we set those surveillance and witnesses as absolutely correct conditions and then solve the problem

You can let go of a lot of distracting thoughts.”

As he said that, Sun Yu placed the photo of the toilet pit in front of the two of them.

"Take the death scene of Liu Dezhu as an example. According to my thinking, if this was not an accident and the murderer did not come to the scene of the crime, then how could he cause Liu Dezhu to die unexpectedly?"

Hearing this, Meng Yuan suddenly felt that the shackles that had been imprisoning his thoughts were gone. Combined with what Sun Yu said just now about Liu Dezhu not taking off his pants, his eyes lit up, "Is there something on the stone slab that attracted Liu Dezhu?"

"That's right!" Sun Yu whispered, "It's like putting a gold brick on a slate, and anyone can take it. If the slate has been tampered with, whoever takes it will naturally step on it and fall.

Of course, the thing placed on the slate this time was definitely not gold bricks. It was night and Liu Dezhu was still drunk. I preferred some electronic equipment that could make noise.

For example, if a mobile phone is placed on a stone slab, Liu Dezhu will find a noise coming from the toilet when he returns home. He will naturally go over to check it, and after seeing the mobile phone on the stone slab, he will naturally go and get it."

Xia Lan and Meng Yuan could not find any basis for refutation for a while.

After the slate was broken, it was divided into six large pieces, which all fell into the pit. Because the area of ​​​​the broken slate was relatively large, the police did not expend much effort when salvaging it. They did not fully salvage the pit.

Meng Yuan frowned and asked, "You're right. Normally, no one would step on that slate, so the murderer might have installed the slate before the supermarket surveillance was enabled, but what about the electronic device that can make sounds?

It can't possibly be prepared in advance, right? The things you take must be placed in a very conspicuous place. Liu Dezhu also returned to the old house three days before the incident, and it was during the day. If it was prepared in advance, he would definitely find it.

I think at least this electronic device only appeared in the toilet on the day of the crime, so it comes back to the question, how did the murderer bypass the surveillance and send the thing to the toilet?"

Sun Yu said: "It's still the misunderstanding I mentioned. Don't always think about how the murderer can avoid surveillance. Can't he just put the electronic equipment on the stone slab?

For example, this kind of old-fashioned toilet in the village has no door and is semi-open. We can set up a crane on the roadside. The robotic arm is long enough, has a small hook, and is easy to operate.

In this case, can we use a crane to lift the mobile phone and put it into the semi-open toilet?"

Sun Yu's assumption was naturally unreasonable. A crane parked on the roadside would have attracted too much attention. It was hard to tell whether there was a hook that could hold a mobile phone.

Of course, this is just a way for Sun Yu to open up Meng Yuan's thinking.

In fact, Sun Yu already had a feasible guess, but unfortunately there was no basis for it. He was afraid that speaking out would affect other people's judgments.

Sun Yu's idea is to use a common small drone to deliver mobile phones to the stone slab of the toilet.

Sun Yu lit a cigarette and exhaled white mist to summarize the first accident: "A guess is just a guess after all. What we have to do is very simple. We will salvage the entire pit and see if there is anything unusual."

Already."

"I'm going to tell Captain Xu and ask him to send people to salvage the latrine." Meng Yuan hurried out of the conference room. He believed Sun Yu's guess.

The entire special case team believes in Sun Yu, but if they want the people from the Criminal Police Team of the Anhe County Public Security Bureau to believe him, they must have evidence.
Chapter completed!