The next morning.
City Public Security Bureau, Han Bin's office.
There was a stack of documents on the desk, all sent by Zheng Kaixuan. Han Bin had personally printed them into documents. Although he could also view them on a computer, it was more convenient to study them on paper.
The person involved in the case was Bao Jiansheng, 45 years old, from the suburbs of Quancheng. Fourteen years ago, he was suspected of being involved in a burglary and murder case, but the chain of evidence was insufficient, so he couldn't be convicted.
One of the important clues was a set of footprints found at the crime scene. The set of footprints had been printed out by Han Bin for careful study. It was a rubber-soled shoe, which was rare nowadays, but was very popular a decade ago.
Bao Jiansheng's footprints were also collected by the police. In order to make it easier to identify, the footprints were also made by rubber-soled shoes. However, after more than a decade, they couldn't find the exact same shoes, so they could only settle for second best and find footprints with similar patterns.
They had been studying it since yesterday afternoon, and it was quite interesting to compare the two sets of footprints. In order to increase the accuracy, Han Bin even asked Zheng Kaixuan to take a few photos of the wear and tear marks on the soles of Bao Jiansheng's old shoes.
At around ten in the morning, Han Bin finally had a result. He picked up his phone and called Zheng Kaixuan.
Zheng Kaixuan's voice came through the phone. "Brother Bin, is there any result?"
"Yes, I've finished studying it."
Zheng Kaixuan asked, "Do the set of footprints at the crime scene match Bao Jiansheng's footprints?"
"Not exactly."
Zheng Kaixuan sounded a little disappointed. "That means we've arrested the wrong person."
Han Bin didn't answer and asked instead, "Captain Zheng, answer my question first. Did this Bao Jiansheng's right leg hurt before?"
Zheng Kaixuan hesitated for a moment. "Yes, he was indeed injured. As far as I know, his leg was broken and he even underwent surgery."
"When did he hurt his leg?"
"About five years ago."
Han Bin said sternly, "According to my research, the footprints at the crime scene fourteen years ago should have been left by Bao Jiansheng."
Zheng Kaixuan was confused. "Didn't you say that the two sets of footprints don't match?"
Han Bin changed the topic. "Although the footprints don't match completely, they are indeed the same person's footprints."
"Brother Bin, tell me in detail. What do you mean?"
Han Bin explained, "Footprint identification is different from DNA, fingerprints, and other evidence. A person's DNA and fingerprints would not change, but footprints were not the same. With age, physical condition, and changes in mentality, a person's footprints would also change.
These two sets of footprints are separated by a gap of fourteen years. The things that happened during these years can affect and change a person, so how can they remain the same? "
Zheng Kaixuan asked, "If according to what you said, Bao Jiansheng's footprints have changed in the past fourteen years, then how do you know that they are the same person's footprints?"
"This is more complicated to explain. Let me give you a few simple examples. First is the length of the foot, which basically does not change. Secondly, the change of footprints can be traced, and it can be reflected in the person's body.
From the information you gave me, I can see that Bao Jiansheng's current weight is about one hundred and eighty pounds, and ten years ago, he only weighed one hundred and twenty pounds. His weight has increased by one-half, and with more than sixty pounds of meat on his back, his walking posture, stride, and gait will all change.
Moreover, his right leg was injured five years ago, and it will affect his walking posture, which to a certain extent increases the difficulty of distinguishing footprints.
In addition, as they grow older, their footprints will move backward. These changes are all traceable. "Han Bin paused for a moment, then continued to speak.
"As long as you reverse the conditions of these changes, you will find that Bao Jiansheng's footprints basically match the characteristics of the footprints at the crime scene."
Zheng Kaixuan roughly understood what Han Bin meant. "With these words of yours, I feel much more at ease. You've really helped me a lot."
"Captain Zheng, after all, this is only my personal analysis based on experience. You'd better ask the experts from the provincial hall to help identify the footprints. Their words are much more useful than mine," Han Bin said with a smile.
Zheng Kaixuan smiled bitterly. He did want to ask the experts from the provincial hall to help issue a fingerprint identification report, which could be used as evidence. However, Expert Liu was not sure, and he did not know when Elder Ma would be discharged, so he could not keep dragging it.
"It's fine if the identification report is done later, I can wait for Elder Ma to be discharged. The key is that your identification results have made me feel at ease, and it has clarified the direction of the investigation. Otherwise, if the police force is deployed and a mistake is made, I won't be able to explain it. "
"Brother, if you ask me, with your ability, you are more than qualified to be a footprint identification expert from the provincial hall. In the future, when I look for you to issue an identification report, it will save me a lot of trouble."
Han Bin smiled. "Captain Zheng, don't flatter me. It's not that easy to get the title of an expert. I'd better focus on my case."
"You've thought it through." Zheng Kaixuan thought about it and agreed. Han Bin was a criminal police officer, and the identification of footprints belonged to the technical department. The two were not even the same department. The police system was very particular about the number of people who were qualified. It was not that easy for an outsider to get the title of an expert from another department. Even if you really had the ability, so what? There were many capable people. You had to first cross that threshold and become one of them, or else everything would be in vain.
Of course, this was not absolute. When a person stood at a high enough position, the so-called threshold would become his stepping stone.
Looking at it from another perspective, Han Bin was already a squadron leader at such a young age. In a few more years, his achievements would be even higher, and he would solve a few well-known major cases. The news of him being proficient in footprints identification would spread like wildfire. At that time, it would not be him who took the initiative to ask for the title of an expert from the provincial hall, but the technical department of the provincial hall would take the initiative to invite him.
The two chatted for a while, and Han Bin mentioned Bao Xing. "Captain Zheng, I have a colleague in the municipal bureau called Bao Xing. He's not bad, and he has been working under me. A few days ago, he was transferred to the provincial hall. He should be in the Criminal Investigation Corps. If you see him, please help me take care of him. "
"Bao Xing, right? I'll remember it. I'll talk to him when I see him later. " Zheng Kaixuan seemed to hear someone calling him from the other end of the phone. "Brother, I'm busy now. Let's talk later."
"Okay." Han Bin responded and then hung up.
The reason why he mentioned Bao Xing was not a spur of the moment idea. After all, they were both from Qingdao, and both of them had a good relationship with Han Bin. One was Han Bin's leader, and the other was Han Bin's subordinate. It would be good for Han Bin to have a good relationship with them.
Both of them were in the provincial hall, and maybe Han Bin would need them in the future.
As for asking Zheng Kaixuan to take care of Bao Xing, it was just an excuse to act as a matchmaker between the two. Bao Xing was transferred to the provincial hall because of his father, and his father's position was higher than Zheng Kaixuan's. It was hard to say who would take care of who in the future.
After finishing his work, Han Bin cleaned up the table and shredded all the documents on it. The criminal investigation corps of the provincial hall handled major cases, and Han Bin did not want these documents to leak out.
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