What is the most important thing to do a case without getting caught?

Low profile.

If someone like Zhou Yunkai likes to read some case files all the year round and search for various real cases on the Internet, they will find that those perverted murderers who behave arrogantly and provoke the police will be arrested by the police the more bizarre their behavior.

In criminal psychology, this is called criminal expression. This kind of person often likes to show off his criminal experience, such as taking videos, taking photos, leaving handwriting at the scene, and humiliating the police in the surveillance.

Charles, a famous serial killer, left religious symbols and insulted the deceased at the crime scene, and the police quickly found Charles, who was the leader of the cult.

The robbery murderer Kang hacked to death a villager in the same village, robbed 25,000 yuan of property, and when he fled, he dialed 110 to provoke the police, described in detail the process of his killing, and said that "I have the ability to arrest me". According to the mobile phone signal, the police quickly locked his location and arrested him.

committed the crime, and deliberately left a lot of clues to humiliate the police and provoke the majesty of the police. This method is cool in the eyes of some criminals, but in the eyes of real high-IQ criminals, it is actually a typical brain-dead behavior.

Crime is not mysterious, evade surveillance, do not leave any fingerprints, DNA and other pointing clues at the crime scene, the police will not be able to find you at all, and there is no way to take you.

Unless you really have a deep grudge against this person, and the police forcibly pressed your fingerprints and wrote a confession, this is basically unlucky.

Do not doubt that there is no such reality. Nie case, Hu case, Teng case, many examples prove that even if you don't commit a crime, you can still be charged with homicide and go to the execution ground. In 2002, there was no argument that could not be found, and even if there was, it would only be reflected in people like Zhou Yunkai.

Changing to another person, in fact, with that fingerprint alone, in that era of presumption of guilt, an innocent passerby could be sent to the execution ground. Of course, there are so many murders in this world every year, and not every one of them is an unjust case, but more of it is an unsolved case.

Like the silver case, the implication is so wide and the impact is so great, the public procuratorate and law organs still did not just find a scapegoat to come out and send it to justice. Rather, it has been tirelessly tracking down the murderer for decades.

Therefore, most of the public procuratorial organs are still very good, and the black sheep are only a few after all. At least Fang Junlong wouldn't do such a thing.

Fang Junlong has a headache now, because he found that this is another very difficult case.

When the meeting was held last night, everyone summarized the case, and when they heard everyone's explanation, Fang Junlong was dumbfounded. There has been no progress in the Hu Jie case, and the poisoning case in the Western restaurant is also clueless. Because the police investigated all the staff working in the restaurant, they found that none of these employees knew chemistry, and none of them had a relationship with them to obtain chemical materials. That is, these staff members, who have the time and opportunity to poison, simply do not have professional knowledge. Then the police can only focus on the guests who come and go during that time period, but how can this be investigated? In addition to some of the people who have applied for a card, there are many people who have not applied for a card?

These people didn't leave their phone numbers, and no one knew who they were, what they looked like, and how did the police check? Run to the TV station and tell the restaurant guests who may have poisoned you, the police are now suspicious of you, please go to the police station immediately for investigation? The murderer is not a fool, how could he jump out on his own?

"Even in the laboratory, the experimenters have to be fully armed, wear safety clothes, long rubber shoes, goggles, masks, and rubber gloves before they dare to do experiments. Because this kind of thing is gaseous above 26 degrees, once inhaled a little, in just a few seconds, it will make people unconscious, and in 2-3 minutes, it can be fatal. It's summer, and hydrocyanic acid should be in a gaseous state, but it is not difficult to make liquid hydrocyanic acid, just heat it with carbon and ammonia in a fixed ratio, and the materials required for the whole process are only simple substances such as methane, sodium hydroxide, and ammonia. Refrigerated and stored, only a small amount of about 40-60 mg is needed to kill a person. ”

Lao Qiu, a forensic doctor of the criminal police team, reported to Fang Junlong in his office: "The deceased's teapot can hold about 1 liter of tea, 1 liter of water is equal to 1,000 milliliters of water, and 1 milligram of water is equal to 0.001 milliliters of water. In other words, 40-60 mg is not even the size of a drop of rainwater, and when it drops into a teacup, it has the bitter taste of tea leaves, and the peculiar smell cannot be detected at all. ”

Fang Junlong asked: "It means that extracting this kind of thing is not high-tech?" ”

"Yes." Lao Qiu nodded: "Even a high school chemistry teacher can easily use simple tools to make it, but if the purity is high, it needs to be continuously refined, and it is a little troublesome." ”

Xiao Liao, the criminal policeman next to him, couldn't help but say: "Such a big living person, just watching others poison himself?" You can't be a fool. How did such a big boss, with two companies and a restaurant under his name, come to be worth tens of millions? ”

"People are the least vigilant in the safest and most comfortable environment. The deceased had not had any problems for decades, and was in the office of the restaurant under his own name, so of course he would not be suspicious of the staff who came in. Fang Junlong said: "It is reported that the deceased did not care about personnel, and the restaurant manager was in charge of the work of recruiting restaurant waiters, so the deceased would not be surprised by the new employees." The murderer only needs to go to the restaurant to change into a staff uniform, swagger into the boss's office, saying that it is to do hygiene, or change a cup of tea for the boss or something, and the deceased who works in front of the computer does not care at all, and can easily drip venom into his teacup. ”

"I suspect the killer was a woman."

Zhang Yu, a criminal policeman who had not spoken, muttered: "We have investigated, during that time period, there were no outsiders entering and leaving the staff area, if there were people in non-staff uniforms entering, then the staff who were busy between the kitchen and the restaurant at that time would definitely be aware of it." So that is, the murderer was either a restaurant employee or someone wearing a restaurant employee uniform. And I observed today that the waiters in the restaurant are all women, and only the chef in the kitchen is men. Although these cooks also went to the toilet or left the kitchen, it does not prove that they were not poisoned, but imagine how the deceased could not be suspicious when a man, especially a cook, arrived in the office? Because the chef didn't have an excuse to go to the boss's office to clean up, if he was to talk about work, then the deceased would definitely stare at the other party's every move, and there would be no chance of poisoning. So I think the murderer is most likely a woman, and only when a woman enters the office will it not arouse any alarm from the deceased. ”

"It's a very constructive statement, and it makes a lot of sense." Fang Junlong said with an affirmative attitude: "It will obviously be very difficult for a man to disguise himself as a chef and go in and poison him. Women are different, and the difficulty is much less. And women usually bring a bag, which is also convenient for carrying work uniforms and disguised as employees. ”

Xiao Liao said: "By the way, the boss, we have sorted out the crime scene. The deceased got off work at 5 o'clock on time from another company under his name, and arrived at the restaurant at about 5:11, the two places are not far apart, and it only takes 5 minutes to drive without traffic jams. After the deceased arrived at the restaurant, he went straight to the office, and at 5:24, the kitchen chef was cooking Western snacks when he heard a cry for help from the office. Although hydrocyanic acid poisoning can kill in a short time, it can take two or three minutes if the amount is sufficient, so when employees rush into the office, they find their boss still alive. They all thought that the deceased was sick and rushed to call an ambulance. After our inquiry, the employees all said that during this time period, no one was found in or out of the boss's office, and if the deceased was poisoned on the spot, the deceased immediately drank the poisonous tea and fell to the ground to call for help, it was very likely to find the murderer. So the killer must have used some means to leave the scene of the crime, and no one found out that she had been in and out of the deceased's office. ”

Lao Qiu thought for a while and said: "It is very likely that it is an ice cube, although the ice cube will melt immediately when put into boiling water, as long as the thermal equilibrium is reached, it will be much slower in the end, slower than in cold water and warm water, so the core ice wrapped in hydrocyanic acid, under the protection of the surrounding low temperature, may take several minutes to completely melt." ”

"These few minutes are enough time for the murderer to calmly leave the scene of the crime." Fang Junlong pondered: "Actually, there is also a problem, that is, what if she happens to be seen by a passing employee when she opens the door, we can know what she looks like." ”

"It's hard." Zhang Yu shook his head: "The route of the restaurant staff is between the kitchen and the dining room, and the deceased's office is in the innermost part of the staff area, you have to pass through the kitchen to get to the staff area, and then pass through the staff area to get to the deceased's office, the kitchen and the deceased's office are about 9 meters, 11.7 meters away from the toilet." In other words, if there is nothing important, the average employee will not put down the work in hand and run over there for no reason. The murderer only needs to put poison, observe in the corner of the wall in the staff area, and once there is no one in the passage, he can directly enter the passage, pretend to be an employee to go to the toilet, and then change his clothes and come out as a guest. ”

Fang Junlong nodded and said, "That's true, have you checked the deceased's personal information and behavior?" ”

"Got it checked. The information of the deceased had already been mentioned at the meeting yesterday, Niu Jin, 51 years old, an entrepreneur, has two companies and a restaurant under his name, and has total assets of about 3,000 yuan. The deceased was a kind person, but he rarely dealt directly with employees, and even when they called him, he would only nod and smile. The main things of the company are handed over to the eldest son to deal with, during the day he sits in the chairman's office to speculate in stocks, and only after work will he come to the western restaurant to read the report information, the principal of the western restaurant is actually the restaurant manager, responsible for recruiting people and restaurant operations, so most of the restaurant employees do not know the deceased at all, if they disguise themselves as employees to go in, it will not make the deceased suspicious. ”

"Although it is not possible for restaurant employees to get hydrocyanic acid in their personal relationships, it is not ruled out that employees can obtain this poison through other means. Therefore, both hands still have to be checked, even if the motive for the murder is still not understood, so as to be kind to the employee according to what you said, it means that the employee has no reason to kill the boss. ”

"Yes."

"How did the deceased's death benefit him, or if the deceased's acquaintances were dissatisfied with him?"

"When the deceased used to do business, he didn't have a grudge, not to mention that he didn't take care of things much now, and he just speculated in stocks and read statements every day, so he wouldn't make enemies with others. The relatives of the deceased and the employees who knew him well said that the deceased was a very good person, and if he saw a good hard-working and hard-working employee on weekdays, sometimes he would give a little more bonus as encouragement. The manager of the western restaurant had been working with the deceased for nearly 20 years, and he had never seen the deceased quarrel with someone with a thick neck, so naturally it was impossible for any mortal feud to be settled. Moreover, the deceased's daily life rules are fixed, and he rarely lives a step-by-step life, so there is no possibility of feuds outside. ”

"Are you sure it's not a vendetta?"

"It's very unlikely."

Fang Junlong nodded and continued, "What about other aspects? ”

"Other aspects are a little more interesting." Xiao Liao said meaningfully: "We found out that Niu Jin's wife was married later, and after divorcing his ex-wife, the eldest son was awarded to Niu Jin. Niu Jin and his current wife have another son, who is only 8 years old this year and is in the second grade of primary school. Now the eldest son is the general manager of Niu Jin's company, Niu Jin is now in the second line, and the company's affairs are basically managed by his eldest son, who has real power, and the younger son is still far away from grabbing the family property with his brother when he is an adult. If Niu Jin dies a few years later, and when the property in Niu Jin's name is transferred by his eldest son, then his current wife and younger son will be able to share much less property. So...."

"So Niu Jin's current wife has a reason to kill him, because as long as he dies now, the property in his name must be divided among her and her youngest son according to the inheritance law. If he dies later, waiting for the property in his name to pass on to the eldest son, then she will not get a penny. ”

Fang Junlong suddenly stood up from his chair and said, "The motive for the murder is most likely this, so follow this aspect,"

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