Chapter 208: High Technology
Came here and wandered around to find a clue? Liu Hongsheng had a look of disbelief. He has been engaged in criminal investigation for many years, and his professionalism is also one of the best in the entire Luzhou criminal police team. He asked himself that he had seen all the places that should be seen, and he did not miss anything. He did not find any valuable clues. What can a layman who graduated from the Department of Political Science and Law see?
I really don't study criminal investigation, but we have cheats. There were no witnesses at the time of the incident, but there was a street tree outside the house. Shen Long just leaned on the street tree to smoke, and he had already asked about the incident from the street tree. , it would be much easier for him to find evidence based on the events of the case. It is not surprising that he found something useful so quickly. WWW.SUIMENG.com
"According to the information on the file, the male owner of this house is frugal by nature. I just looked at the ashtray, and most of the cigarette butts in it have been smoked to the filter. Only one has a long cigarette butt left. It is obviously not in line with the character of the male owner, and it is very likely that it was left by the suspect; according to the results of the interrogation, all the suspects we have found now deny that they have ever entered this house, so as long as we can find out that the cigarette butt is the suspect The one who stayed behind must be the one who committed the crime." Shen Long learned from the street tree that the suspect smoked a cigarette before committing the crime, and the cigarette butt was thrown in the ashtray.
"But how can a small cigarette butt determine who is the murderer? I remember that these suspects all have the habit of smoking. This is not a murder weapon, and there are bloodstains of the suspects on it." Liu Hongsheng still didn't understand, Even if the cigarette butt was really left by the suspect, there is no way to convict him through this. He thought for a while and asked, "You mean to use this detail to interrogate those criminal suspects again? Take some measures to make them confess?"
In any case, Shen Long also found clues that he did not find, and Liu Hongsheng's tone changed unconsciously. For an old criminal policeman like him, a capable person is worthy of respect.
"No, we don't do those illegal things when handling cases." Shen Long knew what he meant by the measures. Sometimes the criminal police team was cornered, and it was normal to do something like extort a confession. This method also had a certain effect. However, it is easy to create unjust, false and wrongly decided cases, and Shen Long is not willing to take it.
What's more, this method is not in compliance with the rules. Li Mingjian may turn a blind eye when other people do it like this. If he dares to do it, Li Mingjian will definitely take the opportunity to drive him away. To use absolutely legal means to break.
"Go back and pack your things. Go to Shenghai with me on business tomorrow. You may stay in Shenghai for two or three days." Shen Long lowered his head and got into the car, and said to Liu Hongsheng.
"Why go to Shenghai?" Liu Hongsheng was even more confused now. Could it be that the real murderer has been controlled by Shenghai Public Security Bureau? This time in the past, the criminal was escorted back to Luzhou City?
"You'll know when you go." Shen Long didn't disclose any more information. He still doesn't know the details of Liu Hongsheng, and he can't guarantee whether telling him the truth will cause any accidents.
Back at the bureau, he told Li Mingjian that he was going to Shenghai for a business trip, and Li Mingjian immediately agreed. He didn't think Shen Long's going to Shenghai at this time had anything to do with solving the case. He wished he could stay in Shenghai as long as possible. , When the time limit for the 72 major case is up, it is time for accountability. Before that, his leaving Luzhou City will definitely not help solve the case.
I went down and made a few phone calls, made some preparations, went back to the dormitory to rest for a night, took Liu Hongsheng on the train to Shenghai the next afternoon, slept in a hard sleeper for a night, and arrived in the morning of the third day. Sheng Hai.
"Captain Qi, here it is!" When he came out of the station, he saw Qin Siyuan waiting outside, beside him was a policeman in police uniform.
"Come on, let me introduce you. This is Comrade Qi Tongwei, the head of the Luzhou Criminal Police Detachment. Team Qi. This is Officer Lu Husheng from the Shenghai Public Security Bureau." Qin Siyuan introduced them.
"I've heard about Captain Qi's name for a long time. It's a pleasure to meet you." Lu Husheng shook hands with him enthusiastically. The title of first-level hero model is still very popular in the system.
Shen Long also introduced Qin Siyuan's identity to Liu Hongsheng, and then the four of them boarded the police car brought by Lu Husheng; To work inside, one must not only know how to make meritorious service, but also determine the attribution of credit, so as not to be robbed by others.
If he solves the case silently, it is difficult to guarantee that Li Mingjian will not give the credit to others. It will be different if Qin Siyuan is with him. When he writes an article and publishes it on "Public Security Newsletter", the credit will be confirmed. .
"Captain Qi, shall we go to the guest house to rest first, or?" Lu Husheng asked while starting the car.
"Let's go to the dna laboratory directly, and get down to business first." Shen Long replied, the purpose of his visit to Shenghai this time is to use dna detection technology to determine who the criminal murderer is. Large-scale application in criminal investigation, only the public security systems in Shenghai and other three places have DNA laboratories, so Shen Long made a special trip there.
"What exactly is this DNA laboratory for?" Liu Hongsheng was confused.
"This is a very advanced technology. It has won the Nobel Prize. Human chromosomes are composed of dna. Each human cell has pairs (46) of paired chromosomes, and the human body has about 1 billion nucleotides. It constitutes the entire life chromosome system, and the exchange and combination before the formation of reproductive cells is random; if it is not identical twins, no two people in the world have exactly the same composition sequence of 1 billion nucleotides, which is It is the theoretical basis of dna comparison and identification." Shen Long learned this detail from an online novel called "Police Officer Han", but he did not expect it to come in handy here.
"Cigarette butts contain the smoker's saliva and oral epithelial cells, which can be compared with the suspect's hair to determine the identity of the smoker." Shen Long took out the evidence bag, "As early as 1984, the UK used A rape and homicide case was solved by dna technology. This technology is flourishing in western developed countries and is widely used in criminal investigations. There are cases of dna identification in the United States and the United Kingdom. The Shenghai Public Security Bureau has just established a dna laboratory, which can Do this test."
"Is there such a powerful high-tech?" Liu Hongsheng, who graduated from technical secondary school, opened his mouth wide. What Shen Long said just now was a bit too mysterious, and it was beyond his comprehension.