At around 8 o'clock in the evening, the business car followed the police car specially to the expressway entrance to welcome him slowly into the brightly lit Dongping Hotel.

Song Wen, deputy director of Dongping Municipal Public Security Bureau, and Ying Chengwen, captain of the Criminal Investigation Detachment, warmly welcomed Han Bo and his party, and held a banquet to welcome the comrades from the Provincial Department's Criminal Investigation Corps.

Unlike the people who come to the superior department, they don’t drink any of them today. Although they are chatting and laughing, they can feel that they seem to be thinking. It is already strange to come to investigate during the Spring Festival. Everyone, including Han Bo, the deputy department-level investigator who is in the limelight during the political and legal system in the province, does not drink any alcohol. Deputy Director Song finds it even more strange.

"Han Chu, you are not in the bar because of the drunkard?" Deputy Director Song looked back at the rare female colleague in Jiang Province, and half-jokingly knocked indirectly.

"Why did Director Song say this?"

Han Bo put down his chopsticks and said with a smile: "What Zhou Detachment and Xiao Ge know, I really can't drink alcohol, I don't drink alcohol. Team Miao, Director Fei, and Section Chief Fang can drink it. The key research task is too heavy. You are just one of the stops. If you want to successfully complete the tasks assigned by your superiors, we must race against time."

"Investigation is not a case-handling process. How urgent can it be? Besides, having two drinks at night will not affect tomorrow's work."

"The key is that we have to work at night."

Han Bo looked back at Zhou Suying and said helplessly: "Director Song, the reason why the department leaders asked us to conduct research now is that they do not want to affect other work after formal work. Second, the detachment Zhou and Comrade Xiao Ni specially invited us to help. The Nangang Municipal Bureau also has a job, and they will leave in two days."

I inquired in the afternoon that the person who is highly valued by the department leaders and even the provincial leaders is very likely to be the deputy captain of the Criminal Investigation Corps.

The new official takes three initiatives, of course he needs to show his performance. It seems that he wants to do something about promoting criminal technology.

If you don’t drink, don’t drink it. Deputy Director Song didn’t force it and asked with a smile: “Director Han, what materials do you need us to provide and what kind of work you need to report on?”

"The materials do not need to be read, and the reports do not need to be listened to. You only need the assistance of the supervision detachment. Go to the municipal bureau detention center and the county bureau detention center below to find a place, randomly select a few suspects, and conduct some psychological tests, which is equivalent to doing scientific research. After all, psychological tests are a new thing in our provincial public security system."

Lie detection is not very reliable!

A few years ago, a case occurred in Nanyun Province. The wife of a policeman in a drug rehabilitation center and another policeman were killed at the same time. It is said that the relationship between the two deceased was ambiguous. The case handlers speculated that it was the policeman who killed it and used a lie detector: the conclusion was that the police denied that the murder confession was a lie.

The case handler determined that the police must have killed the police, so he tortured the confession.

The torture of "Life is worse than death" made the police "accept" everything the case handlers need and were sentenced to death. As a result, the real murderer was arrested two years later, resulting in an unjust case that shocked the whole country. In this unjust case, the lie detector played a very critical role.

Today, I came to investigate and it is difficult to explain whether I will decide to conduct a pilot in Dongping today.

Deputy Director Song did not believe in all unreliable things and said bluntly: "Han, I actually have a little understanding of lie detection. Some data show that the accuracy of lie detection technology to eliminate innocents is as high as 100%, and the accuracy of the determination is more than 90%. According to this, lie detectors are absolutely reliable in "excluding innocents", but it was not able to eliminate the innocent in the case of Nanyun. 100% of the cowhide is considered to be a blow-down?

The accuracy rate of recognition is more than 90%, which means that there are nearly 10% of them that cannot be recognized! It is almost 'unfair' of one out of ten people. I know you are a legal expert, so do you think this can be used as a basis for law enforcement?"

"Focus on evidence and neglect confessions" is a recognized judicial principle, but in some judicial practices, the slightness and importance are reversed, and "confessions" are often used as the main basis for case determination.

When the investigative methods are relatively backward and the empirical acquisition is quite difficult, if the "confession" is not relied on, the efficiency of case investigation will be greatly reduced. Since "confession" is valued and relatively easy to obtain, it will naturally increase the dependence of some case handlers on confessions, which will lead to a decrease in their interest in evidence.

If you put less effort into collecting evidence, it is naturally difficult to improve the detection methods. The backwardness of the detection methods in turn has increased the dependence on confessions, thus forming a vicious cycle.

If you say that you are "presumption of guilt" without evidence, you will inevitably feel unsure. Once you have the assistant of the lie detector, you will naturally have a "proposition" in your heart. Of course, you will be ruthless when you start - so, the lie detector becomes a "accomplice" in torture!

Deputy Director Song does not believe in lieu detection technology and is even a little disgusted with lieu detection technology. This may be a good thing. At least it can be seen that he is a responsible deputy director of criminal investigation.

The old partner came for a lie test, and he said it was very embarrassed. Xiao Ni was also uncomfortable, which made Nan Yun's unjust case related to him.

"The Song Bureau, using advanced technology to improve investigative methods and improve case detection efficiency is not only possible, but also completely. The emergence of lie detectors is a reflection of this requirement."

Han Bo smiled and said slowly: "But the spiritual realm of human beings is still a mystery to human beings themselves. It is erratic and elusive. Even in developed Western countries, lie detectors are still in the experimental stage. Occasionally, they are only used as tools to defeat the psychological defense line of the subjects being tested, and the results themselves are only used as references for judgment.

The purpose of our investigation is not to promote lie detection technology within the public security system across the province, but to study whether lie detection technology can play a positive role in some cases, and to study how to avoid the disadvantages of this technology. Even if it is applied to actual combat in the future, it will be used as cautiously as technical reconnaissance methods, and the test results are only used as reference."

I have come here, so I can't just let them go.

Deputy Director Song weighed the pros and consented: "Okay, we actively cooperate, Director Han, just talk about what you need us to do."

"Psychological tests are not electrocardiograms, and they cannot be tested just by coming up. Before the test, technical police must have a rough understanding of the case and set up a series of problems according to the case. So tonight we plan to divide the troops into two groups, Zhou Detachment and Xiao Ni go to choose a place because psychological tests have certain requirements for the environment.

Team Miao, Director Fei, Section Chief Fang, and Director Yu, based on the randomly selected detention personnel, went to the municipal bureau to review relevant case files and seize the time to understand the case. Try to start the test at 8 am tomorrow and strive to complete the task before tomorrow night."

Although what you do is unreliable, your work attitude is still remarkable.

Deputy Director Song felt it was a bit ridiculous and asked with a smile: "Chu Han, do you really plan to stay up late?"

"The corps' work is piled up like a mountain, and there is nothing we can do about it."

"Okay, I'll make arrangements and promise not to delay your work."

...

After dinner, open the room and arrange your luggage.

Han Bo and his party followed Deputy Director Song and Ying Detachment to the municipal bureau conference room. They called on the way, and a deputy captain of the Supervision Detachment was already waiting in the conference room.

The bureau leader was very busy with work, so he explained it and left in a hurry.

Han Bo sent off the deputy director of criminal investigation and returned to the conference room again, saying with a smile: "Tian Detachment, please provide us with a list of detention personnel from various detention centers in the city; the detachment, wait for us to randomly select a few people who were tested from the list, and then please provide relevant case files."

"No problem. We just built an information system. There is a detention personnel list database. I'll ask the police on duty to print a copy."

"Old Tian, ​​wait."

Ying Detachment grabbed Tian Detachment and smiled back and said, "Director Han, it is very convenient for the list of detainees to come out. The key is that many cases of the people involved are being handled, and some are being investigated and the case files are not very comprehensive. Since it is engaged in scientific research, it is better to choose those cases that have been settled and those suspects who have verified the facts of the crime."

Regardless of whether it is a test or not, there will be a result as long as the test is tested.

He was obviously worried that he would be misled by the unreliable lie test results, and suggested choosing those cases that have been verified, no matter how you test it, it would not have any impact.

The cases involved in the several suspects who are actually going to be tested have basically been verified.

Han Bo pretended to be out of his way and agreed happily: "Okay, the verified case is equivalent to knowing the answer, which is conducive to the accuracy of the statistical test results."

"Then I'll go and have someone print what has been done."

"Chief Han, Team Miao, you guys sit down for a while, I'll ask someone to pour a few glasses of water."

...

There is an information system and the supervision detachment is very efficient.

The specific case is investigated by the branch and county bureau. All the original materials are in the branch and county bureau Criminal Police Brigade. The Municipal Bureau Criminal Investigation Detachment must contact the staff on duty of the branch and county bureau and notify the criminal police brigade to send the case files overnight.

The materials of the municipal bureau are not comprehensive, and the materials of the provincial department are not comprehensive. I just looked at the general situation before, and the first-hand and most comprehensive materials are about to be delivered.

At 11:27 in the middle of the night, materials for six murders and other nine ordinary cases were delivered one after another.

Han Bo and others closed the conference room door and started to study one case at a time.

"In the 01.05 case, the victim was named Zhang Tiangui. He used to run a hotel and had a happy family. Later, he became addicted to drugs and took drugs for a long time. He was forced to quit three times. In order to build a drug money, he lost all his money and could not live a life. His wife ran away with his children. He wandered on the streets and became a homeless man."

Ge Zhengjian posted the newly copied black and white photos on the white blackboard, looked at the materials again, and introduced: "At around 3:15 pm on January 5 last year, a farmer found Zhang Tiangui's body on a barren mountain behind Dongping Second Vocational Middle School. Chengdong Branch immediately dispatched police and found that the deceased had suffered a severe blow to the head, and obvious blunt force injuries and brain fluid was leaking out.

On-site investigation found a brick with bloodstains of the deceased on it. The task force combined the scars on the deceased's head and the on-site environment to determine that the brick was a weapon. The technical police also found a box of matches at the scene, with a restaurant's name printed on it. This box of matches eventually became the key to the case investigation..."

The investigators followed the clues to find the hotel and found blood stains from a piece of clothing at the hotel owner's house.

Dongping Municipal Bureau sent Xueyi to the Criminal Technology Center of the Provincial Department for DNA identification and found that the DNA in the blood was completely consistent with the deceased. As the investigation deepened, more and more peripheral evidence was obtained. It was found that the owner of the hotel also took drugs and had conflicts with the victim.

Miao Wentao raised a photo of the scene and said solemnly: "The fingerprint was not extracted from the bricks, which shows that the murderer was probably committed by wearing gloves. The footprints were not extracted at the scene, which means that the murderer was very careful. How could a person with a certain sense of anti-researching leave the matches on the scene? How could the clothes stained with blood from the deceased not be disposed of as soon as possible?"

"And this large piece of blood is also suspicious."

The forensic doctor Lao Fang stared at another photo and frowned and said, "If the blood was sprayed out or splattered on his body, it should be spots and there should be multiple blood stains. There is only a small piece on this jacket, so it is hard to imagine what would cause such a shape."

The matches customized by the suspect's hotel appeared at the crime scene. The suspect's coat contained the victim's blood. The suspect could not tell where he was on the night of the incident and could not provide a certificate of absence. The suspect and the victim had conflicts with the victim for purchasing drugs...

There is both direct evidence and peripheral evidence, and this case is really an ironclad case.

If the suspect is wronged and if someone really frames the blame, then Nanyun's lie detector is an "accomplice", and the DNA technology of this unjust case is also an "accomplice".

Whether it is instruments or technology, it is all dead, it depends entirely on how to use it.
Chapter completed!