Siheyuan: I have a system and I smile with satisfaction

After examining the fluid in Wang Xiaomei's body, it was determined to be Zheng Aiguo's, and thus Zheng Aiguo was judged to be the murderer.

But Zheng Aiguo has always said that he was wronged.

He admitted that he had had sex with Wang Xiaomei, but it was a voluntary agreement and they were about to get married, which was tacitly approved by both families, but he did not strangle her to death.

But since there is no other evidence and it is difficult to prove his innocence, he is still regarded as the murderer.

It had been confirmed that Zheng Aiguo was the murderer, but then another case happened that was exactly the same, rape and murder.

They were able to detect that something had happened, but they couldn't detect any body fluids in the woman's body.

He was also strangled to death.

At that time, Zheng Aiguo had already been detained and it was impossible for him to go out and commit crimes.

This matter was taken seriously, but the murderer was never found.

In the end, the case was reported to the higher authorities. After all, two rape and murder cases certainly attracted enough attention.

Ni Daguo came here under such circumstances.

After carefully questioning the personnel in charge of the autopsy and laboratory tests, Ni Daguo also went to the murder scene.

With his powerful senses and some traces left at the scene, such as signs of apparent struggle, as well as pressure marks and pinch marks left by the suspected murderer, Ni Daguo roughly judged the murderer's height and weight, hand size, and finger thickness.

I also roughly judged his age. He was a man in his thirties, about 1.75 meters tall and strong.

But there was no other evidence of the murderer, such as footprints, palm prints, hand prints, etc.

But the first case is full of traces of Zheng Aiguo's activities.

But this is a basic judgment. Without actual evidence, it is impossible to confirm that the first case was not committed by Zheng Aiguo.

Ni Daguo knew that the current laboratory tests were not up to standard and could only give a rough estimate. Moreover, in small counties, there was no DNA test, only semen and blood type comparison technology.

Ni Daguo advocated sending the samples to the capital so that qualified people could conduct the tests.

The extracted liquids from the two cases, regardless of whether they belonged to the murderer or not, were all mailed to Beijing for DNA testing.

With the help of Ni Daguo, the results came out quickly. In the first case, there was only Zheng Aiguo's semen DNA. In the second case, there was no DNA component from anyone else, and then there was the deceased's.

This made the local autopsy personnel doubt their own skills.

In the second case, there was no evidence of rape. Was it because of the autopsy? Wasn’t she found guilty?

But after repeated checks, it was confirmed that she had been raped.

The case once again fell into a state of uncertainty, and some people even insisted that Zheng Aiguo committed the crime. The second case was not him, but the first case was definitely him.

Ni Daguo looked at Zheng Aiguo, who was only 1.65 meters tall, and his sensitive intuition told him that this man was not the murderer.

He is just the person who had a relationship with Wang Xiaomei.

There were no hand lines even where the person was strangled. It seemed that he was wearing gloves, with traces of cloth gloves.

This murderer?

Do you know about counter-reconnaissance?

Ni Daguo suddenly thought of condoms in later generations.

Then he smiled bitterly. In China, few ordinary people use it now, mainly because they don't have the awareness. What if it's useless?

Even those who do not suffer from ejaculation disorder will leak some fluid, which cannot escape the DNA test in the capital.

In the end, Ni Daguo was inclined to believe that someone had used a condom or some other barrier, otherwise there was no explanation.

Suddenly I remembered that according to ancient records, people had already used sheep intestines as condoms.

In other words, no matter which method is used, the most likely possibility is that these things are used to block the entry of liquid.

Ni Daguo asked someone to check whether anyone had purchased condoms, after all, very few people did.

Those who have this concept may also be medical staff or people in related industries.

Although it was difficult to screen out in this way, we were able to screen out a group of people in the end.

There was a person who caught Ni Daguo's attention.

This person's height, weight and age were consistent with the murderer he observed and perceived with his mental power.

This person happened to be Lu Jianshe, a doctor at a rural health center, who had bought condoms.

Ni Daguo also looked at his hands, which was completely consistent with his own judgment.

But these cannot specifically determine who is the murderer.

Ni Daguo had Lu Jianshe interrogated, mainly asking where he was at the time of the crime and whether there were any witnesses.

Lu Jianshe couldn't say anything, he just said he was sleeping at home. Of course his family said he was at home, but this couldn't be used as evidence.

The case is at a stalemate again.

It can only be a suspicion, but no real sentence can be imposed.

Lu Jianshe’s wife even protested that he was not innocent, saying that he was clearly sleeping with him at home, so how could he have committed a crime.

The law is like a net, with no loopholes. Ni Daguo doesn't believe that no clues will be left.

He carefully examined the bodies of the two deceased and conducted a detailed examination, leaving no trace.

Suddenly, something resembling debris was found in Wang Xiaomei's mouth. Ni Daguo asked the autopsy personnel, "What is this?"

The autopsy officer took one look and said, "Could it be food residue?"

"Maybe? That means it's not confirmed?"

The autopsy officer dared not say a word, always suspecting that his autopsy might be wrong?

Ni Daguo asked him to carefully take out the debris in his mouth, separate some of it for testing, and also send a copy to Beijing for testing.

The autopsy personnel found out that these things were not food residues, but seemed to be dandruff or something like that.

But it's not accurate enough.

The test results from Beijing came back and it was indeed dandruff material, and a DNA comparison was done, and it was not Wang Xiaomei's, nor Zheng Aiguo's.

Ni Daguo directly mailed Lu Jianshe's blood and skin samples back.

The final examination results showed that Lu Jianshe's DNA was completely consistent with the DNA of the dandruff material in Wang Xiaomei's mouth.

Ni Daguo threw the evidence in front of Lu Jianshe and concluded that it was Wang Xiaomei who bit Lu Jianshe during the process.

At the same time, we checked Lu Jianshe's body and found a tooth mark. It must have been bitten with great force, and must have been broken. Otherwise, there would not have been a mark on it after so many days.

This time, Lu Jianshe has no way to escape as the evidence is conclusive.

He had to confess all his crimes.

Because he had been doing that with his wife for a long time, he had lost his passion for her, so he always ended it hastily and couldn't even get up.

His wife always scolds him and says he is a coward.

As a result, he was scolded so many times that his heart gradually became twisted, and he wanted to know if he had guts.

So I started paying attention to those beautiful girls.

Wang Xiaomei was one of his targets, but during the crime, his hand that was pinching Wang Xiaomei's neck loosened for a moment and Wang Xiaomei bit him. He suddenly became weak and he strangled her to death.

The second case happened because we failed to test it out.

The second incident did prove that he was courageous, but he accidentally strangled the other person to death because he was too excited and used too much force.