Han Bing was impulsive and reckless, but his mobility was really good. He quickly brought Li Yuanyuan's neighbor Liu Xiaohong back to the team for interrogation.
At the same time, Team Chen approached the leader and applied to use a microscope to compare the vertical lines on the nails.
The leader directly rejected it and criticized Team Chen, thinking he was fooling around.
After Team Chen returned to the team, he called Wang Gang over and explained the leader's instructions.
"Xiao Wang, the leader said that there is no precedent for comparing vertical nail lines and there is no scientific basis, so he refused."
"Before the fingerprint comparison came out, no one in the world thought it was unique. Some things can only be known to be right if you do them." Wang Gang asked.
Team Chen sighed and said: "What the leader means is that even if you really compare the vertical lines of your nails, there is no legal basis to use it as evidence."
Wang Gang lowered his face, thought for a moment and said, "Team Chen, can you borrow a microscope?"
Captain Chen was stunned and said, "Do you want to compare the vertical nail lines yourself?"
Wang Gang said: "I can draw the vertical lines on my nails, but it's not accurate with the naked eye alone and requires magnification with a microscope."
Team Chen thought that Wang Gang was unconvinced and wanted to act recklessly, so he tried to persuade him: "Xiao Wang, this case cannot be handled with personal emotions. We can think of another way."
Wang Gang smiled and said: "Captain Chen, I don't want to be reckless. I don't want to use the comparison data as evidence, but to defraud the suspect."
Team Chen is an experienced criminal police officer and he immediately understood what Wang Gang meant.
"Wait for me to make a call."
Team Chen picked up the phone and coordinated 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 for a while and detain Liu Xiaohong from the team first."
Han Bing asked: "Xiao Wang, how long do you want? We have no evidence. Liu Xiaohong was brought back to assist in the investigation, so it won't take too long."
"Just three hours." Wang Gang said, "I still need Zhou Qing's ten fingernails."
"This is easy to handle." Han Bing agreed.
Team Chen over there also borrowed a microscope, and Wang Gang started painting.
He first put the nail fragment 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 with freehand, but the difficulty is several times higher.
Han Bing also had Zhou Qing's nails cut off and handed over to Wang Gang.
Wang Gang wanted to be grateful that in this era, there were fewer restrictions on criminal police handling cases, otherwise it would have been difficult for Zhou Qing to find a lawyer to represent him and get his nails.
Three hours later, Wang Gang drew all the vertical lines on the eleven nails and compared them with each other, confirming that Zhou Qing was not the murderer.
With the comparison results in hand, Wang Gang directly found Han Bing and went with him to interrogate Liu Xiaohong.
At this time, Liu Xiaohong was staying in the interrogation room, already a little impatient.
"Comrade police officer, you called me over to understand the case and asked those few 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 trembled, but he still pretended to be calm and said: "Why do you detain me? I have not committed any crime."
Wang Gang said: "At this point, you still haven't confessed honestly."
"What should I tell you?" Liu Xiaohong rolled his eyes and said harshly: "I still have to work, please let me go."
Han Bing and Wang Gang sat down and said, "Liu Xiaohong, did you kill Li Yuanyuan?"
Liu Xiaohong was startled and stammered: "Comrade police, please don't accuse good people unjustly. I was the first to discover Li Yuanyuan's body, but I didn't kill anyone! Otherwise, why would we call the police?"
Wang Gang said coldly: "You are very smart. You know that you can't hide it if you kill someone, so you choose to call the police proactively to reduce the police's suspicion of you.
?But your cleverness was mistaken for you. Let me ask you, how did you discover Li Yuanyuan’s body?”
Liu Xiaohong said calmly: "I live next door to Li Yuanyuan. I passed by her house when I was at work and found the door open. I curiously went in and took a look, and then I found Li Yuanyuan lying on the ground."
Wang Gang sneered: "There are many people who don't lock their doors now, why do you think it's strange!"
Liu Xiaohong explained: "Li Yuanyuan's parents passed away early since she was a child. She has always lived alone and has the habit of locking the door."
Han Bing also heard something was wrong at this time.
"Since Li Yuanyuan lives alone, you, a grown man, still want to break into her house?"
Liu Xiaohong paused and said, "Li Yuanyuan and I are neighbors. We both live in the same hospital. We have a good relationship. We sometimes go to her house."
Han Bing shouted angrily: "You are still making excuses. I asked my neighbor. Li Yuanyuan doesn't invite men to her home because she doesn't have a partner yet."
Liu Xiaohong began to panic, and Wang Gang took the opportunity to produce a nail comparison report.
"We found a piece of broken armor on Li Yuanyuan's body. It does not belong to the deceased, but probably belongs to the prisoner." 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, I can't understand what you are going to say." Liu Xiaohong's cultural level was not high and he did not understand what Wang Gang meant.
Wang Gang said: "We took Zhou Qing's fingernails for comparison and found that they were inconsistent with the murder scene. Please cooperate and let me cut some nails for comparison."
As soon as he finished speaking, Liu Xiaohong covered his hands nervously, not daring to expose his nails.
At this time, Wang Gang and Han Bing had determined that Liu Xiaohong was the murderer, and he began to feel guilty.
Han Bing slapped the table hard and shouted to Liu Xiaohong: "Hurry up and cut your fingernails."
Wang Gang took out a pair of scissors and threw them in front of Liu Xiaohong, frightening him.
"No, no, I don't want to cut my nails." Liu Xiaohong said in a panic.
Han Bingbing smiled and said, "It's still up to you."
With that said, Han Bing forcibly cut Liu Xiaohong's nails. To be honest, this was a bit of violent law enforcement, but no one cared. If it were changed twenty years later, Han Bing would be in big trouble.
After getting Liu Xiaohong's nails, Wang Gang immediately started comparing them. Two hours later, Wang Gang took the comparison results and came to the interrogation room again.
At this time, Liu Xiaohong looked horrified and almost mentally collapsed.
Wang Gang took out two pieces of paper, one of which showed fingernail fragments from the crime scene. However, after magnifying it several hundred times, the vertical lines were clearly visible.
The other picture is of course Liu Xiaohong’s nails.
"After comparison, the vertical lines on the nail of your left middle finger are exactly the same as the vertical lines on the broken nail at the crime scene. What else can you say?"
Wang Gang's paintings are very realistic, just like photos. Liu Xiaohong 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 her head and crying bitterly.
Han Bing and Wang Gang looked at each other and understood that Liu Xiaohong's psychological defense had completely collapsed, and what happened next would be much simpler.
"You still haven't confessed honestly. I will be lenient if you confess, but strict if you resist." 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 chased her for a long time, but she didn't agree. That day I went to her to confess my love to her, but Li Yuanyuan said that I was a toad who wanted to eat swan meat. I was so excited that I couldn't help but pinch her neck."
Liu Xiaohong covered his face and cried.
"I really didn't want 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 later?"
Liu Xiaohong cried: "Li Yuanyuan kept saying that she would call the police and accuse me of being a hooligan. She kept shouting. I was afraid that the neighbors would hear me, so I covered her mouth and held her neck. Unexpectedly, she ran out of breath after a while."
Wang Gang recorded Liu Xiaohong's confession verbatim, and the case was considered closed.
