After listening to Captain Zhang's explanation of the case, looking at the heavy iron locks and seals on the door, Lin Lei's brows became tighter and tighter.

This seal was sealed by the Hulan County Public Security Bureau, and if you want to open the door and enter, it is impossible to do it at all in the current situation.

Lin Lei was just a small policeman who came to assist in the investigation, and his level was obviously too low to remove the seal.

If you want to remove the seal and enter the site, you must go through the "organizational process", and you have to agree to it, these processes are very cumbersome, and Lin Lei has no reason to let the top remove the seal.

There is no need to go into detail about this matter, as long as people with low emotional intelligence naturally understand, Lin Lei is very sure that he is not Long Aotian, and he does not bother to do anything Long Aotian.

So it seems impossible to enter the scene at present, so where should the case start?

Lin Lei subconsciously touched his pocket, but found that there was no chewing gum, only a cigarette case, so he took out two red plum cigarettes, handed one to Captain Zhang, lit one himself, and began to think.

This case is different from previous cases, and it is extremely difficult to solve the case.

To put it simply, this is an open-ended case - more than ninety percent of the big and important cases in reality are open-ended cases.

That is, who the suspect is, there is no scope at all.

But unlike cases that limit the scope of suspects, open-ended cases are almost solved once the suspect is locked.

The people who eat melons are accustomed to choosing one of the four suspects in the ABCD TV series in the detective TV series, but in fact, that kind of case rarely appears in reality.

For example, in the current Hulan Daxia case, as long as a suspect is found to be suspicious, then whether he is the murderer or not will be known at a glance.

The reason is simple, the police have the fingerprints of the murderer.

Even if you don't have fingerprints, because this is a serial murder case, as long as the murderer enters the police's sight, he will definitely not be able to escape.

There have been so many serial homicides, and the murderer cannot be denied just from the time of the crime.

And in this kind of case, as long as the police search the suspect's residence, they will often find relevant evidence.

In a word, if you are not afraid of the murderer's denial, you are afraid that no one will enter the police's sight.

However, it seems easy to find a suspect from the vast sea of people, but it is actually a very difficult thing.

In history, the Hulan Daxia case has not been solved for more than 30 years, because no one has really entered the police's sight - or rather, all the people who have entered the police's sight have been eliminated through fingerprints.

Lin Lei knew very well that he didn't need to deduce all the truth of the case in detail like the previous apartment murder case - all he had to do was to bring suspects like Takashima or Ito into the Public Security Bureau, nothing more. Naturally, he doesn't have to worry about the rest.

Open-ended cases, herein lies the difficulty.

There are tens of thousands of middle-aged men in Hulan County, and even if all of them are fingerprinted, it is useless - who can guarantee that the murderer must be a local?

Just like the BAI Silver serial murder case, the police collected almost all the DNA and fingerprints of all the men in BAI Silver back then, but it was useless because the murderer was not a BAI Silver person at all......

In serial homicide cases, the first case often has very important revelations.

Because the first case was the beginning of the murderer's path of no return, he chose this point of no return, and there was no chance to turn back. It is common sense to speculate that without sufficient motives, no innocent person will kill casually - killing pays for life, which is a consequence that everyone knows.

Why did the murderer choose Officer Li's family to do it?

And as soon as it is shot, it is a big case!

For a while, Lin Lei's thoughts flew away - he had to think about the problem with the thinking of the people of the eighties, and he must not use the thinking of thirty years later, otherwise it would be the opposite direction.

At that time, I am afraid that my thinking was not as open as it was 30 years later, and I am afraid that thinking about things may not be too complicated.

……

After a long time, the cigarette in Lin Lei's hand was about to burn to the butt of the cigarette, so he reacted and retracted his thoughts.

Lin Lei looked up, but found that Captain Zhang was staring at him-

Lin Lei couldn't help but smile awkwardly and said, "Captain Zhang, I'm a little absorbed in my thoughts......

Captain Zhang snuffed out the cigarette in his hand and said with some confusion: "I don't think you kid is thinking about anything else, are you thinking about the case?"

"Hmm. Lin Lei nodded lightly and asked Captain Zhang, "Captain Zhang, what do you think the murderer's motive for killing Officer Li was?"

"Grab the gun!" Captain Zhang blurted out, and then frowned a little: "But the experts from the province don't agree......"

Lin Lei's eyes lit up, and he hurriedly asked, "What do the experts in the province say?"

Captain Zhang touched his nose and said in a deep voice: "According to the analysis of experts in the province, the murderer did take Officer Li's gun in the end. However, logically speaking, there are many ways to get a gun, not to mention that you can get it on the black market, let's just say that it is purely by robbery, and it will not kill people all over the place, right? Experts say that the murderer is a person who commits the crime, and if he misses a blow after entering the scene and a fight occurs, the police will have certain fighting skills, and the murderer is also at a disadvantage in terms of numbers, and the risk of committing the crime is too great. ”

Lin Lei smiled: "An expert is an expert, and the analysis is very reasonable! The murderer killed the police all over the house in order to get a gun, and the risk of this crime is too great!"

Captain Zhang nodded and said, "Well, that's the opinion of the expert group......"

Lin Lei knew that in that era, few people dared not listen to the words of experts.

"Captain Zhang, why do you think the murderer is just to grab the gun?" asked Lin Lei with a smile.

Captain Zhang was stunned for a moment, habitually looked around, and then lowered his voice and said: "Don't take it out and talk nonsense, you kid, I have a good relationship with your father, and I watched you grow up since I was a child, so I said it casually......"

"Understood, understood, I understand too well! Captain Zhang, you just have to say, you just say it, I can listen to it casually. The smile on Lin Lei's face was even bigger.

Captain Zhang thought for a moment and said, "The expert office has been sitting for a long time, and it is a bit idealistic and dogmatic. ”

"Oh, what do you say?" asked Lin Lei.

Captain Zhang looked around again, and then said in a very small voice: "I have seen too many of these people, and there are not a hundred or eighty of them planted in my hands - more than seventy percent of the criminals have no brains." They think about the problem very simply, very directly, without so many twists and turns. ”

After a pause, Captain Zhang continued: "You can indeed buy guns on the black market, but I know very well that there is no 1,800 yuan, buy a bullshit! Generally, those who are mixed on the road, have heads and faces, will choose to buy guns, and those people have a source of economic income." And the average person simply can't afford to buy a gun. If you want to say that in other places, you can indeed get guns, but the police must have guns, and the murderer will not fail in committing the crime. ”

The pit is too deep to dwell on the "black market" – it was 30 years ago, and it doesn't have to be measured by today's standards.

As for the "mixed on the road", Lin Lei naturally understands that in the 80s, this was also a common situation, otherwise what would he "crack down"?

While listening, Lin Lei nodded, and said with a smile: "Captain Zhang, I think-"

"What do you think?" Captain Zhang was a little looking forward to Lin Lei's answer.

Lin Lei smiled and said meaningfully: "I think what you said is very reasonable, more reliable than the brick family!"