The heavens set sail from the courtyard

Han Bing is an impulsive person who acts rashly, but he is very capable and quickly brought Li Yuanyuan's neighbor Liu Xiaohong back to the team for interrogation.

At the same time, Team Leader Chen approached his leader and asked to use a microscope to compare the vertical lines on the nails.

The leader directly rejected it and criticized Captain Chen, thinking that he was fooling around.

After Captain Chen returned to the team, he called Wang Gang over and told him the leader's instructions.

"Xiao Wang, the leader said that there is no precedent for comparing the vertical lines on the nails, and there is no scientific basis, so he rejected it."

"Before fingerprint matching came out, no one in the world thought it was unique. Some things can only be known to be right after you do them," Wang Gang asked.

Captain Chen sighed and said, "What the leader means is that even if you really match the vertical lines of the nails, there is no legal basis to use it as evidence."

Wang Gang lowered his face, thought for a moment and said, "Captain Chen, can you lend me a microscope?"

Captain Chen was stunned and said, "Do you want to compare the vertical lines of your nails yourself?"

Wang Gang said: "I can draw the vertical lines of the nails, but it is not accurate with the naked eye, and I need a microscope to magnify it."

Captain Chen thought Wang Gang was unwilling to accept the situation and wanted to act recklessly, so he urged him: "Xiao Wang, you can't bring your emotions into this case. We can think of another way."

Wang Gang laughed and said, "Captain Chen, I didn't intend to do anything reckless. I didn't intend to use the comparison data as evidence, but to trick the suspect."

Captain Chen is an old criminal policeman and he immediately understood what Wang Gang meant.

"Wait for me to make a call."

Captain Chen picked up the phone and went to coordinate the microscope in front of Wang Gang.

At this time, Han Bing brought Li Yuanyuan's neighbor Liu Xiaohong back to the team.

"Team Leader Han, please delay the time and detain Liu Xiaohong first."

Han Bing said in embarrassment: "Xiao Wang, how long do you want? We have no evidence. Liu Xiaohong was brought back to assist in the investigation. It won't take too long."

"Three hours will be enough." Wang Gang said, "I still need Zhou Qing's ten fingernails."

"That's easy." Han Bing agreed immediately.

Team leader Chen also borrowed a microscope, and Wang Gang started painting.

He first placed the piece of nail that had been found at the scene under a microscope, observed the vertical lines with the naked eye, and used a pencil to draw the thickness and spacing of each fine line.

This process is destined to be long. The principle is similar to drawing a barcode by hand, but the difficulty is several times higher.

Han Bing also asked someone to cut Zhou Qing's nails and give them to Wang Gang.

Wang Gang should be grateful that in this era, there are fewer restrictions on criminal police handling cases, otherwise it would be difficult for Zhou Qing to find a representative lawyer and get his nails.

Three hours later, Wang Gang drew out the vertical lines of the eleven nails, and after comparing them with each other, he confirmed that Zhou Qing was not the murderer.

With the comparison results, Wang Gang went directly to find Han Bing and went with him to interrogate Liu Xiaohong.

At this time, Liu Xiaohong was in the interrogation room and was already getting a little impatient.

"Comrade police officer, you called me here to understand the case and asked me the same questions over and over again. When can I leave?"

Han Bing and Wang Gang walked into the interrogation room and sneered: “Liu Xiaohong, you can’t leave today.”

Liu Xiaohong couldn't help but shudder, but he still pretended to be calm and said: "Why are you detaining me? I haven't committed any crime."

Wang Gang said: "It's already this late, and you still don't tell the truth."

"What do I have to confess?" Liu Xiaohong rolled his eyes and said stubbornly, "I still have work to do. Let me go."

Han Bing and Wang Gang sat down and said, "Liu Xiaohong, did you kill Li Yuanyuan?"

Liu Xiaohong was shocked and stammered: "Police comrade, please don't wrongly accuse a good person. I was the first to find Li Yuanyuan's body, but I didn't kill anyone! Otherwise, why would you call the police?"

Wang Gang said coldly: "You are very smart. You know that you can't hide the murder, so you choose to call the police to reduce the police's suspicion of you.

But you are too clever for your own good. Let me ask you, how did you find Li Yuanyuan's body? "Liu Xiaohong said calmly: "I live next door to Li Yuanyuan. I passed by her house on my way to work and found the door open. I went in to take a look out of curiosity, and then I found Li Yuanyuan lying on the ground."

Wang Gang sneered: "Nowadays, many people don't lock their doors. Why do you find it strange?"

Liu Xiaohong explained: "Li Yuanyuan's parents passed away early, and she has been living alone since she was young. She usually has the habit of locking the door."

Han Bing also heard something wrong at this time.

"Since Li Yuanyuan lives alone, why are you, a grown man, barging into her house?"

Liu Xiaohong paused and said, "Li Yuanyuan and I are neighbors. We live in the same courtyard and have a good relationship. Sometimes I go to her house."

Han Bing shouted angrily: "You are still quibbling. I asked the neighbors and found out that Li Yuanyuan doesn't have a boyfriend yet, so she usually doesn't invite men to her home."

Liu Xiaohong started to panic, and Wang Gang took the opportunity to take out the nail comparison report.

"We found a piece of broken nail on Li Yuanyuan's body. It didn't belong to the deceased, but most likely belonged to the criminal." Wang Gang said to Liu Xiaohong:
"You may not know that nails have unique textures that are different for everyone, just like fingerprints."

"Comrade police, what on earth are you trying to say? I don't understand." Liu Xiaohong has a low level of education and doesn't understand what Wang Gang means.

Wang Gang said: "We took Zhou Qing's fingernails for comparison and found that they were inconsistent with the crime scene. Please cooperate and let me cut some of your fingernails for comparison."

As soon as he finished speaking, Liu Xiaohong covered his hands with a nervous look on his face, not daring to show his nails.

At this time, Wang Gang and Han Bing had already determined that Liu Xiaohong was the murderer, and he began to feel guilty.

Han Bing slammed the table hard and yelled at Liu Xiaohong: "Cut your fingernails quickly."

Wang Gang took out a pair of scissors and threw it in front of Liu Xiaohong, scaring him out of his wits.

"No, no, I don't cut my nails." Liu Xiaohong said in panic.

Han Bing sneered: "It's up to you."

Having said that, Han Bing forcibly cut Liu Xiaohong's nails. To be honest, this was already a bit of violent law enforcement, but no one cared. If it happened twenty years later, Han Bing would be in big trouble.

After getting Liu Xiaohong's nails, Wang Gang immediately began to compare them. Two hours later, Wang Gang came to the interrogation room again with the comparison results.

At this time, Liu Xiaohong's face was full of fear and his spirit was almost collapsed.

Wang Gang took out two pieces of paper. One of them had a picture of nail fragments from the crime scene, but when it was magnified several hundred times, the vertical lines were clearly visible.

The other one is naturally Liu Xiaohong's nails.

"After comparison, the vertical lines on your left middle fingernail are exactly the same as the vertical lines on the broken nail at the crime scene. What else do you have to say?"

Wang Gang's paintings are very realistic, just like photographs. Liu Xiaohong only graduated from elementary school and had little experience, so he was immediately intimidated by Wang Gang.

"I don't want to kill her. I don't want to kill her." Liu Xiaohong collapsed, holding his head and crying.

Han Bing and Wang Gang looked at each other and realized that Liu Xiaohong's psychological defenses had completely collapsed, so the next step would be much easier.

"You still don't tell the truth. If you confess, you will be treated leniently. If you resist, you will be treated severely." Han Bing shouted angrily.

Liu Xiaohong said with red eyes: "I will confess. I am willing to confess."

Wang Gang took out paper and pen and began to record Liu Xiaohong's confession.

"I have always liked Li Yuanyuan and pursued her for a long time, but she didn't agree. That day I went to her to confess my love, but Li Yuanyuan said I was a toad wanting to eat swan meat. I was so excited that I couldn't help but strangle her neck." Liu Xiaohong covered her face and cried.

"I really didn't mean to kill her. When I came to my senses, I had already had sex with her."

Han Bing clenched his fists and asked, "Then why did Li Yuanyuan die?"

Liu Xiaohong cried, "Li Yuanyuan kept saying she was going to call the police and sue me for hooliganism. She kept screaming, and I was afraid the neighbors would hear her, so I covered her mouth and grabbed her neck. I didn't expect she would die a moment later."

Wang Gang recorded Liu Xiaohong's confession word for word, and the case was considered closed. (End of this chapter)