Lin Lei glanced at Lao Lu meaningfully, and said lightly: "Lao Lu, you are not highly educated, I'm afraid you can't understand what I'm going to say next." Pen "Fun" Pavilion www.biquge.info but it doesn't matter, you just listen to it. ”

Lin Lei straightened his voice and said loudly: "Luminol, also known as luminous ammonia. When examining blood stains, heme catalyzes the reaction of luminol with hydrogen peroxide, showing blue-green fluorescence. This test is extremely sensitive, capable of detecting only one part per million of blood, and can detect even a small drop of blood into a large tank of water......"

After a pause, Lin Lei continued: "Well, you probably don't understand this. You just need to know that no matter how much time has passed and how many times you have wiped it at the scene, as long as there is a trace of one millionth of a trace of blood left, we police can detect it!"

ps (I didn't find out how long the blood stains could be detected by luminol, and some cases could be found seven or eight years ago...) There is no need to pick thorns, you can replace them with DNA or scientific and technological developments that can be found out from 20 years ago. The focus of this case is on the idea of solving the case. Reasoning is based on logic, thank you. Another book friend must stay away from the idea of committing a crime, as long as the scene is locked, it will be found out, and now technology is very developed. The number of words in this PS is free.,Ask pirated readers to start to support it.。。。 )

Lin Lei really didn't understand the first half of the sentence, but how could he not understand the second half of the sentence?

Million!

Oh, my God!

Old Ludon couldn't stand still, sat down on the ground, and muttered, "I knew I should have burned it...... I knew I should have burned it down......"

The people who eat melons don't seem to understand the meaning of Lao Lu's words, but the policemen present all understand!

"It", naturally, is the bookshelf!

Although it was wiped repeatedly after the incident, a trace of blood stains can be seen on the bookshelf under the luminol reaction!

That's right, it's the bookshelf!

The blood of the victim Ai Qing was flowing on the books, and those blood-stained books were obviously destroyed by Lao Lu a long time ago.

But what about the bookshelves?

Such a bulky bookshelf, Lao Lu wiped it repeatedly at most, and he thought it was cleaned up when he couldn't see the bloodstains!

In fact, how is it possible to clean it up completely?

Even if there is no trace of blood on the ground, there will be one on the shelf!

The bookshelves of Lao Lu's bookstore were all bought by Mu Dongfang shortly after the crime and the crime scene was rebuilt!

Mu Dongfang's biggest role in doing this is to keep the bookshelf on the scene!

"Whew-" The scene burst into warm applause.

Director Ma, Officer Wang, and all the policemen at the scene couldn't help but applaud Lin Lei at this moment.

The number one unsolved case in China -- the Dongda corpse shredding case -- was solved like this.

Ai Qing's spirit in heaven can rest in peace.

This is a case that should not have happened.

Because the cause was just an accident......

Later, according to Lao Lu's confession, Ai Qing was only seriously injured and in a coma at that time, and did not die immediately.

Lao Lu "calculated" in the back room for more than ten minutes, and Ai Qing finally died.

In those more than ten minutes, no book tenants came to the door......

Lao Lu had told the police and Lin Lei "countless times" that his rented bookstore had customers all the time that day, and it seemed that there were no conditions to commit the crime at all.

I don't know if the police believed it back then, anyway, Lin Lei didn't believe a word.

Pingcang Lane is just a small alley in the middle of nowhere, and at dinner time, the likelihood of no one at one point is much greater than "there are people anytime and anywhere"!

It's just that Lao Lu's words can be understood, because when anyone is suspected, he will "exaggerate".

Unless there is direct evidence, this does not mean that there is something wrong with Lao Lu.

When the incident happened suddenly, Lao Lu chose a wrong way to deal with it in a panic.

Of course, maybe subconsciously, or in Lao Lu's bones, he is a selfish little citizen.

If he hadn't been selfish to the extreme, afraid of compensation and responsible for medical expenses, I believe Ai Qing would not necessarily die.

A fresh life is gone, and the body is still "cut with a thousand knives".

This is already the case, leaving only endless sighs for future generations.

……

Following.

Oriental Mansion.

Today, the place is full of joy, the lights are colorful, and the whole mansion has a new look.

During the day, Mu Dongfang hosted a banquet for a group of relatives and friends, plus a news reporter who was invited for money......

The effect to be achieved is naturally to "whitewash" his son Mu Qihui - because the Dongda corpse crushing case was solved, Mu Qihui's heart disease did not exist, so Mu Qihui's autism was magically "cured".

Things that money can't solve in this world have always been rare, so Mu Dongfang certainly achieved his goal.

The luncheon was invited to those above, but at the dinner, Mu Dongfang only invited one person, and that was Lin Lei.

Of course, Lu Yun, Gu Li and Li Xiaoan also came together.

The dinner was very rich, Lin Lei and Lu Yun only tasted it, while Li Xiaoan and Gu Li were feasting.

After three rounds of wine and five flavors of food, Mu Dongfang began to ask Lin Lei about the situation of the Dongda corpse crushing case.

Although Mu Dongfang is not a policeman, he has specialized in criminal investigation far more than his main business in the past 20 years.

He knew that someone in the Closing Lane had a problem, but after twenty years, Mu Dongfang just couldn't be sure who had the problem......

After clinking glasses again, Mu Dongfang raised the question in his heart: "Superintendent Lin, can you tell me how you deduced that Ai Qing entered Carpenter Liu's courtyard, and then went to Lao Lu's bookstore while waiting for Carpenter Liu to go home?

Lin Lei understood what Mu Dongfang said, he meant that there were countless possibilities for Ai Qing's whereabouts that day, why was he sure that Ai Qing went to Carpenter Liu......

This is not a particularly difficult question, so Lin Lei gave a direct answer: "Your question is very good. This is a question about the direction of the investigation. In this case, we should first grasp the high-probability incident -- the three common motives for murder, such as love killing, vendetta killing, and financial killing, are all low-probability events. ”

The three common motives for killing, such as emotional disputes, grudges with others, and intentions for money, are indeed small probability events in the case of the Dongda corpse crushing case. Because the police investigation did not reflect that Ai Qing had emotional disputes and deep hatred, and a little girl in the countryside was obviously not a rich person.

Lin Lei continued: "Then lustful intentions, perverted random killings and accidents have become high probability events. Psychopathic killers can be ruled out first, because psychopathic killers are generally serial crimes, and the possibility of such psychologically distorted killers doing a 'solitary case' is extremely low......"

No one can deny that during the investigation before and after the Dongda corpse crushing case, there was a great possibility of a perverted killer.

But after 20 years, it turns out that this is an isolated case.

The remaining rape and murder and accidental emergencies cannot be determined, depending on where they are planned.

If Ai Qing was in a very secluded place, then the possibility of rape and murder was relatively high. But if Ai Qing had been killed in a relatively lively place, rape would have been unlikely......"