Criminal investigation is not only a technical discipline, but also a social discipline. When we focus too much on the clues and try to find the truth from these intricate clues, we often lose sight of the very simple part of the case at the beginning.

Professor Li Yunqing is a superstar in the field of criminal investigation, just like Cruyff is to football, he is not only a practitioner of outstanding achievements, but also a guide of theoretical rigor and innovation and learning. Before the age of 65, he served as the chief criminologist of the FBI in the United States for a long time, founded the forensic science laboratory, and solved many strange cases. After the age of 65, he returned to China, where he devoted himself to writing books and writing, and also served as the chief counsel of criminal investigation assigned by the ministry.

Today, this master of criminal investigation appeared in the case analysis class of the Police Academy, and asked in public to get to know a child first. In a word, there was an uproar in the classroom, and all eyes were focused in one direction.

The child was listening to music, and his half-open and half-closed eyes indicated that he was very intoxicated at the moment. Didn't even notice the changes in the classroom.

Song Qiang was embarrassed, and the old gentleman's grandson Li Bowen looked surprised, the long-legged sister got up and turned around, and pulled down the headset on Gu Tianyou's head. 、

Gu Tianyou suddenly realized, and soon fell into a daze again. Why are they all looking at me like that? What does Supervisor Song's straight eyes mean? And who is that old gentleman? Isn't he in a case study class? What are they all staring at me? Huh? Why does this old gentleman look so familiar?

"You are Gu Tianyou?"

"Ah, yes, I'm Gu Tianyou, hello, who are you?"

Song Qiang couldn't wait to rush up to Gu Tianyou and wake up this bastard who didn't know how to be blessed in the midst of blessings. If the person the old gentleman paid so much attention to was him Song Qiang, it was hard to say whether he would be happy on the spot. Of course, he could only think about it, first, the old gentleman didn't pay attention to him, and secondly, he didn't have the courage to slap him in the face.

"I'm Li Yunqing. The old gentleman didn't mind introducing himself again.

Gu Tianyou suddenly understood why he was in the spotlight, and this Taishan Beidou figure in the criminal investigation world must have spoken to him just now. And he was immersed in Lu Ziqi's incident, and he didn't respond at all.

It's a very rude and very rude thing.

The old gentleman didn't mind, and Gu Tianyou didn't feel honestly afraid.

Gu Tianyou stood up and said frankly: "I'm sorry, my ears were deserting just now." ”

Li Yunqing pulled a chair and sat down, casually: "My ears are deserted, what are you thinking in my head?"

Gu Tianyou said: "I'm thinking about a case." ”

"You don't have to participate in the next case discussion, continue to think about your case, if you don't mind, I want to hear what case you were thinking about just now after class. Li Yunqing smiled and said, "Let's continue to discuss the case." ”

The old professor cleared his throat and said loudly: "Students, the reason why I allowed him not to participate in the discussion of this case analysis is because Gu Tianyou put forward a decisive opinion on the direction of detection during the investigation of this case. He turned his head and asked Song Qiang: "Teacher Song, where is the discussion?"

Song Qiang said: "The students are analyzing the case and expressing their opinions. ”

Li Yunqing nodded and said, "Okay, then I will talk to you about the investigation process of this case, as well as a few of my personal opinions." ”

Everyone has already heard from your teacher Song about the case, so I won't repeat it. Let's talk about the positioning of the detection direction I just mentioned. Before we begin, I'll tell you a story and see what kind of inspiration you can get from listening to it.

That was what happened last summer, just on the section of the road where the poisoning and murder occurred, a Volkswagen sedan had a flat tire accident, broke through the guardrail and rolled into the drainage canal on the side of the road.

The male driver was stuck between the steering wheel and the seat, and the six-year-old boy was squeezed into the back seat by the badly deformed car, his leg was stuck under the passenger seat, and his blood vessels ruptured, but as long as the rescue and fashion were not enough to threaten life. The female victim was trapped in the passenger seat from the waist down, suffered a head injury, and the artery of her arm was cut and bleeding profusely.

A few minutes later, Cao Xuewen, a road guard, passed by the scene of the accident, and after hearing the male driver's cry for help, the man squatted in front of the car, first discussed the issue of rescue compensation, and then found Sun Youcai, a passing waste picker, and the two worked together to try to turn the accident vehicle over, but failed.

About 10 minutes later, nearby villager Gao Zhanzhan and migrant worker Jin Xigui arrived one after another. The four of them had a good chance of turning the car over and rescuing the injured. In front of life, they should have raced against time, but they had a quarrel because of a bottle of Sprite that fell out of the car, and during the dispute, Gao Zhanzhan took the Sprite drink, Jin Xigui thought that Cao Xuewen had concealed something on the issue of remuneration and refused to help.

Twenty minutes later, when the high-speed 120 arrived, another ten minutes were wasted to rescue the injured. By this time, the boy had stopped breathing due to hemorrhagic shock. The woman was taken to the hospital and became a vegetative state. The male driver was not seriously injured and was discharged from the hospital quickly.

What happened next is known. Gu Tianyou made a suggestion to the task force to adjust the direction of the investigation to the highway. The task force mobilized all the accident reports on the highway within half a year, found the names of the four victims in the accident narrative records, and locked up the suspect in the case, Liu Zhichao, the brother-in-law of the silver mine technician. The suspect confessed to poisoning and murder, and the case was solved.

There was silence in the classroom.

A death highway, a traffic accident, a bottle of Sprite, four unrelated people.

Together, these words form the cause and effect of this serial poisoning murder.

What impressed the students was not only Gu Tianyou's key tips in this case, but also the greed and stupidity of the four people, and the madness and cruelty of the murderer.

"When you leave here one day and walk into the crime scene, please remember what I said to you today, criminology can never be summarized by data and experiments, understanding human nature and cognitive technology are equally important, technical traces can be faked, but human nature is what you and I have, I have been in this industry for forty-eight years, and now I only believe in one thing, all evil deeds have roots, the deeper your understanding of human nature, the more conducive to your judgment of motives to restore crimes. ”

"However, I remember that you once said in a book that all crimes have traces, and that finding traces is the basis for punishing crimes. Gu Tianyou raised his hand and said.

"That's the United States, all accusations need to be supported by evidence, and it's been three and a half years since I returned to China at the age of 65, and the national situation has changed, and the work style of the judiciary has also changed, and I have to keep pace with the times. Professor Li Yunqing smiled naughtily at Gu Tianyou like an old naughty child, and after saying this, he turned to Song Qiang and said, "Xiao Song, please lend me your high feet for a day, I want to talk to this child." ”

Song Qiang naturally wouldn't refuse, and before he could make a statement, one of the students quit first, and Li Bowen shouted: "Grandpa, didn't you say that you came to visit relatives? Li Yunqing glanced at Song Qiang. The latter immediately nodded and said, "Of course, aren't you here to visit your relatives?"

••••••

Ancient building district office, meeting room.

Li Yunqing was in front, Gu Tianyou and Li Bowen were behind, and the two young people were stunned as soon as they entered the door.

Ding Baofeng is here, Bai Fenglin is also there, Director Ma Fuchun of the Municipal Bureau is also there, and Director Meng Qingchun of the Gulou Branch doesn't even have a seat. The position of Ding Baofeng's head was vacant, Li Yunqing walked straight over and sat down, and said, "The person has arrived, can you start?" Ding Baofeng said: "It's still presided over by Lao Dai." ”

Dai Xiaolou kept looking down at the file, raised his head when he heard the words, glanced at Gu Tianyou and Li Bowen, nodded, and said, "First of all, Comrade Zhao Wanchen from the Gulou Branch will introduce the case to you." ”

Zhao Wanchen, dressed in military uniform and in good spirits, stood behind Meng Qingchun, took one step, first saluted the leaders present, and then said: "Several leaders, teachers, Dai Corps, hello everyone, let me introduce the case to you." ”

At the beginning of last month, a vicious wounding incident occurred on Linhu Street in our district, and the people's police in the jurisdiction quickly attacked after receiving the alarm, and arrested the suspect Zeng Wenqiang, who was preparing to flee on the spot, and found 40 kilograms of methampheny-propylamine in the process of searching the murder weapon. After an overnight surprise interrogation by the criminal police team of the sub-bureau, Zeng Wenqiang confessed to his crime of entering the city under the fate of poison. At the same time, it was explained that the transfer object was Yang He, the foreman of the purple drunken gold fan leisure area.

There has never been such a big drug-related crime case in the history of the city with 40 kilograms of new drugs, so it is no wonder that many bigwigs from top to bottom attach so much importance to it. Gu Tianyou's heart was dark, and he only listened to Zhao Wanchen continue to introduce the case.

Subsequently, the criminal police team carried out the order of Comrade Meng Qingchun, the head of the sub-bureau, and carried out secret surveillance of the purple drunken gold fans. At the same time, the city bureau and the corps were informed of the case.

On the 28th of last month, Comrade Guo Maoxiang, a first-class police officer of the Criminal Police Team of the Municipal Bureau, replaced Zeng Wenqiang and went to the purple drunk gold fan to contact Yang He. After that, Comrade Guo Maoxiang disappeared.

At present, it has been 72 hours since Guo Maoxiang's disappearance, and it is business as usual for purple drunk gold fans, Yang He took leave the afternoon before yesterday on the pretext of going home to pick up clothes, and then disappeared on Xingong Street. According to Lao Fu, the second group of the criminal police team responsible for monitoring at the scene, he was walking on the road when he suddenly got into an unlicensed Toyota Highlander off-road vehicle that was slowing down.

Due to the uncertainty of Comrade Guo Maoxiang's life and death, the leaders of the city bureau decided not to take compulsory measures against the purple drunken gold fans for the time being, but to use secret investigation methods to investigate. It turned out that there were many problems, but none of them were enough to reach the criminal case. In the course of the secret investigation and visit, Guo Maoxiang's whereabouts were not found. Considering that the meeting place agreed between Comrade Guo Maoxiang and Yang He was not the Purple Drunken Gold Fan, there is no direct evidence to prove that the Purple Drunk Gold Fan is related to Guo Maoxiang's disappearance.

Decoupling means losing control of the suspect, which is a relatively low-level mistake in the police world.

Gu Tianyou was already aware of the tone again, and glanced at Li Bowen, and found that this kid's eyes were shining brighter than he was more excited than taking the medicine.

"That's Team Zhao, I have a question I want to ask. When Gu Tianyou heard this, he probably knew the reason why he was found. This case is handled in such a mess, and there are problems with both the handler and the commander, and considering that he may cooperate with these people to handle the case, some ugly words are still better to say in advance.

Zhao Wanchen glanced up at Gu Tianyou, not angry: "If you have any questions, wait until your turn to talk, now your task is to listen." ”

This turtle grandson treats Lao Tzu as an intern child. Playing in front of Lao Tzu, the Dai team is not good enough, which turn can you kid?" Gu Tianyou smiled, shrugged his shoulders, and spread his hands: "Actually, I think my task should be to listen to lectures in the academy." After saying that, he turned around, shook the door and left.

In the corridor, Gu Tianyou hadn't walked a few steps when Dai Xiaolou's voice told him to stop came from behind him, and when he looked back, even Li Yunqing chased him out.

Gu Tianyou said in his heart, this is just right. Pointing to the office next to him, he pushed the door open and walked in. A first-class superintendent was working, and when he saw Gu Tianyou uninvited, he was about to question, and then he saw Team Dai who was carrying the first-class police inspector sign coming in, and waved his hand at him, and this guy immediately got up and walked out.

"Lao Dai, I won't go around the bend with you, what does this case need me to do, I probably know it in my heart, originally, since I choose to do this business, I can't be afraid of taking risks, you know that I'm not a greedy breed who is afraid of death, but I can't do this brainless stupid business. As soon as Gu Tianyou entered the door, he sat on the table, swayed his legs, and said: "Listen to this case, cooperate with this level of goods, and have a head that is not enough for him to sell." ”

Dai Xiaolou glanced sideways at Professor Li Yunqing and smiled awkwardly. Li Yunqing waved his hand and said, "It's okay, what this kid said is very right, Zhao Wanchen is my student, but after all, he is still young, he has studied in the United States for a long time, and he lacks sufficient knowledge of all aspects of domestic police work." ”

Gu Tianyou continued unceremoniously: "What Elder Li said is right, I see that buddy is a master who talks on paper, but I don't make a fuss this because of him, but also for my personal reasons, the case of the Abduction Gang just ended a while ago, and I just rested for a month, and I have to go into battle again, I can't accept it in my heart." ”

Dai Xiaolou was angry, and said with a straight face: "If you have any conditions, just say it directly, don't beat around the bush with Lao Tzu." ”

Gu Tianyou jumped down and said, "The one who knows me is also the head team, then I will say it directly, it just so happens that the two parties are here." ”

Li Yunqing was slightly surprised: "What's the matter?"

Gu Tianyou nodded and said solemnly: "This matter has to be yours." After speaking, he turned to Dai Xiaolou and said: "I ask that Li Lao take the lead and set up a special case team to restart the investigation of the murder of Lu Zonglin, secretary general of the Qinzhou Municipal Party Committee, and his wife at home 19 years ago. ”

Dai Xiaolou's face darkened when he heard this, and he glanced at Li Yunqing, who said, "Young man, this is the case you were thinking about in class just now?"

Gu Tianyou said: "Elder Li is Elder Li, this is the case, how about it? Are you willing to take it?"

Dai Xiaolou was afraid that Li Yunqing, a madman who solved the case, would agree, so he hurriedly said: "Nineteen years have passed since that case, and Mr. Xu, who was mainly in charge of this case at that time, has been sacrificed for more than ten years, and even the scene of the crime has long been unrecognizable, is it meaningful for you to restart the investigation of this case now?"

Li Yunqing raised his eyebrows and asked, "Is it the case that Xu Tao handled?"

Dai Xiaolou said: "Yes, Director Ding and I were both members of the task force, and the investigation of that case was carried out for a long time, and the two main suspects were eliminated successively, and the case had to be reported and suspended when the third suspect could not be found." ”

Gu Tianyou actually knew that what he said was reasonable, and he also felt that there was little point in restarting the investigation, and considering the current identity of the suspect, the restart of this case was destined to encounter great resistance. But having said that, things still have to be done, just to call Lu Ziqi's sister.