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The development of the matter was jaw-dropping. The person who thought it was the murderer was not only not the murderer, but also a forensic expert who forced himself to split his personality in order to catch the murderer.

After explaining the misunderstanding, the four found a shop to sit down and chatted about the "joke" that happened tonight.

To Yin Shun and Xia Huai, everything that happened tonight was an absurd farce, and to Yi Qingjue, it was a rare reunion with a senior whom he admired after a long absence.

Xia Huai expressed his apology to Qiu Lizhi, but Yin Shun didn't say anything and seemed a little disappointed.Everyone wanted to catch the murderer, and tonight was the closest they could get to a murderer.

They ordered a few bottles of beer and small dishes, so that after tonight's turmoil passed, they would talk about the day and reminisce about the old days.

"The task force has been re-established, Professor." Yi Qingjue handed Qiu Lizhi a cigarette, and asked carefully and expectantly, "Professor Qiu, have you considered joining the task force again?"

Qiu Lizhi took the cigarette he handed over, lit it, took two puffs, and said: "I have been involved in this case for too many years, and now I can finally get out of it, and I don't want to fall into it again. Because of this case, I lost my job, lost my relatives, and finally my son Come back and admit me, I don’t want to lose my son again. Now is the age of young people.” He took a puff of smoke, looked at Xia Huai and Yin Shun and said, “Whether it is the construction of the times or the investigation of unsolved cases, every development needs Fresh blood. How can our old and rotten views help the case?"

"Professor Qiu, don't say that. If it weren't for your inferences, we might be in a dead end forever."

Qiu Lizhi gulped down a glass of white wine and said with a smile: "I just lead you to another dead end again and again. Xiao Yi, you are the captain now, you have to learn to listen to young voices more. These young people may not have personally experienced some unsolved cases, but their ideas are often very valuable."

"Look at these two boys." Qiu Lizhi patted Xia Huai on the shoulder, "At night, within a few minutes, I was identified as a suspect. When he saw me, he made eye contact for only a second, and immediately rushed up to arrest me. I This leg, the long-distance running champion back then, didn’t he also get caught? Heroic and decisive. This is the young people of today, no worse than we were at that time.”

Xia Huai was embarrassed by Qiu Lizhi's compliment, but Yin Shun had no expression on his face, as if he had been thinking about other things since just now.Maybe I'm stuck in a contradictory reasoning again.

Yi Qingjue responded with a smile: "Indeed, the opinions of young people can play a key role in many cases."

Qiu Lizhi ate two peanuts, and said to Yi Qingjue: "If your special case team is really short of talents, I think these two guys are good. Recruit them."

Yi Qingjue also agrees with Qiu Lizhi's words. Both Yin Shun and Xia Huai have potential, especially Yin Shun, who has strong observation skills, quick thinking, and good physical fitness. He will be a rare talent in the police force in the future.Even if Qiu Lizhi doesn't give him advice, he will try every means to recruit Yin Shun into the Criminal Police Force.

As for Xia Huai, Yi Qingjue always thought that Xia Huai was a sharp knife, and sooner or later he would call him back.

"How is Xiaobai? Is he still a policeman?" Recalling the past, they had to mention Bai Zeting. If it wasn't because he broke up the task force back then, Qiu Lizhi should still be a professor now.

"Damn. I just quit being a criminal police officer." Yi Qingjue didn't really want to talk about this person. They were silent for a while, and Yi Qingjue looked at Yin Shun who was sitting silently beside him, "Yin Shun, your professor recommended me the day before yesterday. about you."

"Huh?" Yin Shun seemed to have regained his senses at this moment, and responded to him.

"About the homework on how to catch the spider killer, other people's homework wrote tens of thousands of words of inferences, only you wrote Y-STR."

Almost everyone here knows what these four letters represent. Only Xia Huai was confused and asked, "What is Y...STR?"

"A DNA detection method." Yin Shun answered him, "The Y-STR locus is a human polymorphic STR locus located on the male Y chromosome. Generally, only male individuals have a Y chromosome, so Y-STR It is male-inherited and male-specific."

Xia Huai probably understood what it was, but she still couldn't make up her mind: "Then what can this kind of test do?"

Yin Shun further answered: "This Y chromosome in males is inherited from your father, your father's father. This chromosome is passed on from male to female, and will not recombine with other chromosomes. All male individuals, including brothers, father and son, uncles, cousins ​​and grandchildren, have the same Y-STR haplotype. Do you understand?"

Xia Huai is still in the fog. In the past, he was only responsible for catching thieves and doing odd jobs, and was not responsible for participating in the investigation process of the case. He had no experience in many things.

Yin Shun went on to say: "The police can extract his Y chromosome from the criminal's DNA. Using this chromosome, the police can find people from the same family as the criminal, and they can also determine the criminal's family."

Xia Huai suddenly realized "Oh", and finally understood that this test can directly give the police a search area.

"Last year, Haidao established a Y-STR database. In the database, we found a person with a chromosome similarity to the spider killer. That person's name is Liu Junhao, and he beat Xia Huai before." Yi Qingjue shook the ashes and said, "He is People from the Liu family in Qishui Town, Lou County. After the police confirmed that the criminal was from that family, they immediately took a team to Qishui Town to collect the DNA of everyone in the Liu family. During this investigation, we found the identity of the spider killer. Distant relatives, close relatives, uncles, cousins, and even his father were found. But in the end, the criminal himself was still not found.”

"Even his parents have been found, how could he not be able to find him?" Xia Huai was puzzled.

Yi Qingjue took a puff of cigarette and sighed: "There used to be a lot of traffickers in that village, and the criminal was trafficked at a very young age. Even his biological parents didn't know what he looked like."

Yin Shun frowned unconsciously, he never thought that this case could be so difficult.After so many years, the clues still go to the end, which is a dead knot.

At this desperate moment, Yi Qingjue gave them another hope: "But his biological parents told the police a piece of news today."

Yin Shun asked: "What news?"

"He said that when their child was born, there was a mole the size of a fly on the white of his eye."

The eyes of Yin Shun and Xia Huai flashed brightly, revealing expressions of surprise.

Getting this clue is a big breakthrough for this case!As long as the characteristics of the murderer's face can be known, the scope of the search can be greatly narrowed.People with moles on the whites of their eyes are especially rare. The police only need to intensify their searches in Jimei District and the port area, and they will soon find the suspect.

However, at this moment, Qiu Lizhi spoke up: "According to my many years of research, this person has a perverted personality, has a strong endurance, and has a strong ability to hide. If he hides deliberately, he can get into a cesspit. The police don't work hard." , it's hard to find him."

Yin Shun thought for a while and said, "Actually, there is another way to find him faster."

Yi Qingjue raised his chin: "Let's listen."

"Announce the news that the victim of the Jinshan incident was carrying HIV." Yin Shun said, "Su Xiaohan was knocked out by the murderer when she resisted, and the tooth was bleeding. Then, she bit the murderer, and the murderer also bit the blood. There is a high chance that the blood of the murderer will flow into the murderer's wound. If the murderer is unlucky, he may be infected with HIV."

"I really hope he has this bad luck." Xia Huai whispered to herself.

Yin Shun continued: "To popularize AIDS knowledge in the media, we need to let the murderer know that he is likely to be infected, and then use the media to tell him that the CDC can get HIV test strips for free and do not need to register his identity to lure him into the bait. Of course, While seeking help from the media, we must also limit online speech, so as not to prevent some 'smart people' from guessing the police's intentions and posting them online, letting the murderer know and not showing up."

Yi Qingjue held two peanuts on his mobile phone, hesitating: "The solution is a good one, but..."

Seeing Yi Qingjue hesitated, Yin Shun seemed to see through his thoughts: "Are you worried about Su Xiaohan?"

"She is still unconscious. It is not ethical for us to disclose her privacy without consent."

"To deal with an immoral murderer, if you insist on such lofty morality, you will never be able to catch him for the rest of your life." Yin Shun said bluntly, "Officer Yi, try to think about it, if Su Xiaohan was killed by the murderer that night, then you What's the use of keeping this little privacy for a dead man?"

"But the fact is that Su Xiaohan is not dead now, she is just in a coma. She will wake up, what do you want the world to think of her after she wakes up?"

Yi Qingjue was a little more worried.

"She sold enough drugs to shoot her ten times!" Yin Shun emphasized this point.A drug dealer doesn't need to have a good look from the world. "Since her life and death are still unknown, I suggest that Officer Yi should treat her as a dead person and handle this case."

This kind of problem often occurs in group discussions. When the principles of each other conflict, it is often difficult to reconcile.

"Young man, you have to save face for seniors." Qiu Lizhi, who was eating peanuts, couldn't help but said.

Seeing Yin Shun speak more and more seriously, Xia Huai was afraid that he would accidentally offend someone, so she hurriedly said: "There is no need to speak so seriously. Didn't the police not release Su Xiaohan's information from the beginning? Let's just say that among the victims If the HIV virus is detected in the blood of the patient, and it doesn’t say whether it came from the victim or the murderer, isn’t that all right?”

In comparison, Xia Huai's proposal seemed to be much better than Yin Shun's.

Yi Qingjue agrees with Xia Huai's method even more, and decides to follow Xia Huai's method.