At more than 8 o'clock in the evening, the business car followed the police car that went to the highway to greet the highway and slowly drove into the brightly lit Dongping Hotel. Pen % fun % Pavilion www.biquge.info

Song Wen, deputy director of the Dongping City Public Security Bureau, and Ying Chengwen, head of the criminal investigation detachment, warmly welcomed Han Bo and his entourage, and set up a banquet for the comrades from the criminal investigation team of the provincial department.

Unlike the usual people from the higher departments, they don't drink at all today, although they talk and laugh, but you can feel that they seem to have thoughts. It was already strange to come over to investigate during the Spring Festival, and everyone including Han Bo, a deputy director-level investigator who was in the limelight in the province's political and legal system during this time, didn't drink anything, and Deputy Director Song felt even more strange.

"Han, wouldn't you be a drunkard and not be in the bar?" Deputy Director Song looked back at the rare female counterpart from Jiang Province, and half-jokingly knocked on the side.

"Why did Song Ju say this?"

Han Bo put down his chopsticks and said with a smile: "Detachment Zhou and Xiaoge know, I really can't drink, I don't smoke or drink." The Miao team, Director Fei, and Section Chief Fang can drink, the key research task is too heavy, you are just one of the stops, if you want to successfully complete the task assigned by the superior, we must race against time. ”

"Investigation is not case handling, how urgent can it be, and if you drink two drinks in the evening, it 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: "Song Bureau, the reason why the leaders of the department let us investigate now is that they don't want to affect other work after they officially go to work, and second, the Zhou detachment and Comrade Xiao Ni are specially invited to come over to help, and there is work on the side of the Nangang City Bureau, and they will leave in two days." ”

I inquired in the afternoon, and the person around me who is highly regarded by the leaders of the department and even the provincial leader is very likely to be the deputy head of the criminal investigation corps.

The new official took office with three fires, of course, he had to show performance, and it seemed that he wanted to make a fuss about the promotion of criminal technology.

If you don't drink, you won't drink, and Deputy Director Song didn't force it, and asked with a smile: "Han Division, what kind of materials do you need us to provide, and what kind of work do you need to listen to?"

"You don't need to read the materials, you don't need to listen to the report, you just need the assistance of the supervision detachment, go to the city 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 engaging in scientific research, after all, psychological testing is a new thing in our provincial public security system. ”

Polygraph, not very reliable!

A few years ago, there was a case in Nam Yun Province in which the wife of a police officer in a drug rehabilitation center and another police officer were killed at the same time, and it is rumored that the two deceased had an ambiguous relationship before their deaths. The investigators speculated that the police officer killed him and used a lie detector: the conclusion was that the police officer's confession of denying the murder was a lie.

The case-handling personnel determined that the person must have been killed by the police, so they tortured him to extract a confession.

The torture of "life is worse than death" made the police "confess" everything that the case-handling personnel needed and was sentenced to death. As a result, two years later, the real culprit was arrested, resulting in an unjust case that shocked the whole country. In this unjust case, the polygraph played a very key role.

Coming to investigate today, it is difficult to say whether it will be decided to carry out a pilot project in Dongping tomorrow.

Deputy Director Song did not believe in anything unreliable, and said bluntly: "Han Division, in fact, I know a little bit about polygraphs, and some information shows that the accuracy rate of polygraph technology to exclude innocent people is as high as 100%, and the accuracy rate of identification is more than 90%. According to this, the lie detector is absolutely reliable in 'excluding the innocent', but the innocence of Nagumo's case has not been eliminated, and 100% of the cowhide can be regarded as blown, right?

The accuracy rate of the determination is more than 90 percent, that is, nearly 10 percent of it is not recognized! It will almost 'wrong' one out of 10 people. I know you're a legal expert, do you think this can be used as a basis for law enforcement?"

"Emphasizing evidence over confession" is a well-established judicial principle, but in some judicial practices, the severity is reversed, and "confession" is often used as the main basis for adjudicating cases.

In a situation where the means of investigation are relatively backward and it is quite difficult to obtain empirical evidence, if we do not rely on "confessions," the efficiency of case investigation will be greatly reduced. Since "confessions" are valued and relatively easy to obtain, it will naturally increase the dependence of some case-handling personnel on confessions, which will also lead to a decrease in their interest in evidence.

If less effort is made to collect evidence, it will naturally be difficult to improve the means of investigation, and the backwardness of the means of investigation will in turn make the dependence on confessions even heavier, thus forming a vicious circle.

If it is said that there is a "presumption of guilt" in the absence of evidence, it is inevitable that there is no bottom in the heart, and once there is an assistant of the lie detector, the "presumption" will naturally be "specified" in the heart, and of course the next step will be ruthless -- as a result, the lie detector has become an "accomplice" in extorting confessions by torture!

Deputy Director Song does not believe in polygraph technology, and even has some dislike for polygraph technology, which is not a good thing, at least it can be seen that he is a responsible deputy director of criminal investigation.

The old partner came for the polygraph, and he was very embarrassed by him, and Xiao Ni was also uncomfortable, as if Nanyun's unjust case was related to him.

"Song Bureau, using advanced technology to improve investigation methods and improve the efficiency of case detection is not only possible, but also completely should. The advent of polygraphs is a reflection of this demand. ”

Han Bo smiled and said slowly, "But the spiritual realm of man is still a mystery to human beings themselves, it is erratic and elusive. Even in the developed countries of the West, polygraphs are still in the experimental stage, and occasionally they are only used as a tool to break down the psychological defenses of the tested, and the results themselves are only used as a reference for judgment.

The purpose of our investigation is not to promote polygraph technology in the province's public security system, but to study whether polygraph technology can play a positive role in some cases, and at the same time 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 carefully as technical reconnaissance methods, and its test results are only used as a reference. ”

It's all here, you can't just let them go.

Deputy Director Song weighed it and agreed: "Okay, we actively cooperate, Han Division, what do you need us to do, just ask." ”

"The psychological test is not an electrocardiogram, it is not something that can be measured when you come up, and before the test, the technical police should have a general understanding of the case, and set up a series of questions according to the case. So tonight we plan to divide the troops into two ways, Zhou Detachment and Xiao Ni to choose a place, because the psychological test has certain requirements for the environment.

Team Miao, Director Fei, Section Chief Fang, and Director Yu went to the Municipal Bureau to review the relevant case files according to the randomly selected detainees, and seized the time to understand the facts of the case. Aim to start testing tomorrow at 8 a.m. and finish the task by tomorrow night. ”

Although the work is not reliable, this work attitude is still remarkable.

Deputy Director Song felt a little ridiculous, and asked with a smile: "Han Division, do you really plan to stay up late?"

"The work of the corps is piling up, and there is nothing to be done. ”

"Okay, I'll arrange it, and I promise not to delay your work. ”

……

After eating, open the room and settle the luggage.

Han Bo and his entourage rushed to the conference room of the Municipal Bureau with Deputy Director Song and the Ying detachment, and made a phone call on the way, and a deputy head of the supervision detachment was already waiting in the conference room.

The leaders of the bureau were very busy with their work, so they explained and left in a hurry.

Han Bo sent off the deputy director of criminal investigation, returned to the conference room again, and said with a smile: "Detachment Tian, please provide us with a list of detainees in various detention centers in the city; ”

"No problem, we just set up an information system, which is in the database of detainees, and I will ask the police on duty to print a copy. ”

"Lao Tian, wait. ”

The Ying detachment grabbed the Tian detachment, turned around and said with a smile: "Han Division, it is very convenient to transfer out the list of detainees, the key cases of many people involved in the case are being handled, and some are supplementing the investigation, and the case file materials are not very comprehensive." Since it is engaged in scientific research, it is better to select those cases that have already been completed and those suspects who have verified the facts of their crimes. ”

Whether it's a test or not, as long as the test is a result.

He is obviously worried that he will be misled by unreliable polygraph results, and recommends choosing those cases that have already been verified, no matter how you test it, it will not have an impact.

The real suspects to be tested have basically been confirmed in the cases they are involved in.

Han Bo pretended not to listen to his words, and readily agreed: "It's okay, the verified case is equivalent to knowing the answer, which is conducive to the accuracy of the statistical test results." ”

"Then I'll have someone print it's done. ”

"Han, Miao team, you sit down for a while, I'll call someone to pour a few glasses of water. ”

……

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

The criminal investigation detachment of the city bureau should contact the personnel on duty at the sub-bureau and the county bureau and notify the criminal police brigade of the criminal police brigade to send the case file overnight.

The materials of the municipal bureau are not comprehensive, and the materials of the provincial department are even less comprehensive.

At 11:27 p.m., materials for six homicides and nine other ordinary cases arrived one after another.

Han Bo and the others closed the door of the conference room and studied case by case.

"In the 01.05 case, the victim's name is Zhang Tiangui, who originally opened a restaurant and had a happy family, but later became addicted to drugs, took drugs for a long time, and was forcibly quit three times. In order to raise drug funds, his family went bankrupt, and his life could not go on, his wife ran away with the child, and he lived on the street and became a homeless man. ”

Ge Zhengjian pasted the black-and-white photo he had just copied on the blackboard, looked at the materials again, and introduced: "At about 3:15 p.m. on January 5 last year, a farmer found Zhang Tiangui's body on the barren mountain behind the Second Vocational Middle School in Dongping City.

The on-site investigation found a brick with traces of the deceased's blood on it, and the task force determined that the brick was the murder weapon based on the scars on the deceased's head and the environment at the scene. At the same time, the technical police found a box of matches at the scene, and the name of a restaurant was printed on the match, which eventually became the key ...... of the case."

The investigators found the restaurant and found blood stains on a piece of clothing from the hotel owner's home.

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

Miao Wentao held up a photo of the scene and said solemnly: "No fingerprints were extracted from the bricks, so it can be seen that the murderer is likely to wear gloves to commit the crime." No footprints were extracted at the scene, indicating that the murderer was very careful. How could a person with a certain sense of anti-investigation leave matches at the scene, and how could clothes stained with the blood of the deceased not be disposed of as soon as possible?"

"And this large patch of blood is also suspicious. ”

The forensic doctor stared at another photo, frowned, and said: "If the blood is spurted out or splashed on the body, it should be spotted, there should be multiple blood stains, and there is only a small piece on this coat, it is difficult to imagine under what circumstances it will cause such a shape." ”

The match ordered by the suspect's hotel appeared at the scene of the crime, the suspect's coat had the victim's blood on it, the suspect could not tell where he was on the night of the crime, and could not provide an alibi, and the suspect and the victim had a conflict with the victim over the purchase of drugs......

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

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

Whether it's the instrument or the technology, it's all dead, it's all about how to use it.

Han Bo took a deep breath, raised his head and said, "Xiaoge, let's go next." ”