Unlike other local police stations, the Capital Police Department has officers on duty in its own lounges.

Moreover, because it is in the same city as the Criminal Department, the Police Department did not arrange a place for Zhao Yu and others to stay.

In addition, the police station is far away from Cui Lizhu or the Miao family's mansion, so Zhao Yu had to pay out of his own pocket and open a room in the hotel opposite the police hall.

At this moment, it was already more than three o'clock in the middle of the night, Zhao Yu was lying on the bed after taking a shower, but his mind was still running around, flashing back all the details of the video murder case.

Zhao Yu knew that he couldn't meditate like this anymore, and since he already knew that this was a long tug-of-war, he had to maintain enough energy to deal with the future showdown.

So, he had to use an invisible sleeping pill for himself to force himself to sleep.

Perhaps, he has become dependent on sleeping pills, and after using them, he suddenly felt a sense of relief, and his tense nerves also relaxed.

Call......

He silently made up his mind that after solving this case, he must recuperate and recuperate, and he can no longer take medicine easily.

Although the system props have no toxic side effects, it is never a good habit to rely on drugs to force you to sleep.

After soothing his nerves, Zhao Yu finally had time to take a good look at his system interface again.

Although the opening area is still frozen and will take a long time to thaw, his Adventure Points have been steadily increasing.

In the past few days, with the investigation of various encounters in the video homicide case, his points have soared by more than 4,000 points, and the total points have reached more than 17,000 points, a record high.

At this rate, if you want to reach 100,000 points and then move up the next level, it is just around the corner.

Zhao Yu couldn't help but be full of longing, I don't know, after the system is upgraded to another level, what advanced functions will appear?

But well......

Zhao Yu glanced at the props in the prop column, and pondered in his heart, although there were a lot of props, they had little effect on the case in front of him.

Looking at all the props, it seems that only that memory flashback device may still be able to play a role.

If you stun Yun Duo'er by yourself, and then use the memory flashback device to extract the memories of her kidnapping and murder back then, you may really be able to see what happened in the case.

But......

Can this kind of prop be used?

First, if you stun Yunduoer without authorization, you may be caught by her, and it is not easy to explain;

Second, the memory flashback device can only flash back 5 minutes of memory, and there are not many of them left, only two left, in case you don't find the right time, it will be wasted.

Third, the video extracted by the memory flashback device can only be viewed by oneself and cannot be used as evidence in court.

By now, Zhao Yu was already sure that Yun Duoer was the real murderer, so it seemed unnecessary to use the memory flashback device again.

Besides, the flashback images of the memory flashback device are also the footage that Yun Duoer saw by herself, so what is the difference between watching the murder video on the videotape?

Therefore, the top priority at the moment is to focus on collecting evidence, and can no longer rely on these sideways.

Alas!

Zhao Yu sighed, and thought to himself, it would be good if he could open a hexagram now, no matter what hexagram was written, he could at least help himself make a judgment.

Just like the last demon case, even if the hexagram does not prescribe the "Gen" hexagram, it can still show that you are looking in the wrong direction, and you can try other methods with confidence.

On the contrary, you can prove that your thinking is correct. But now, without the instructions of the hexagram, I feel a little lost.

Thinking, thinking, sleeping pills began to work, and Zhao Yu soon fell into a dreamless sleep......

......

When he woke up the next day, it was already past eight o'clock in the morning, and Zhao Yu, who was worried about the case, couldn't even eat breakfast, so he hurried back to the capital police department.

"Team leader," as soon as he entered the door, Zeng Ke told Zhao Yu an important news, "The comparison has been successful, Yun Duo'er's DNA matches one of the DNA samples found in Kang Ziqing's leather bag!"

"Oh?" Zhao Yu took Zeng Ke's test report, nodded and said, "It turns out that it is the one with the least sample information." ”

"Yes," Zeng Ke said, "a few bits of dander tissue!"

"Tsk......" Zhao Yu hurriedly asked, "Can you prove that these dander tissues were extracted from the videotape?"

"No!" Zeng Ke shook his head regretfully, "Those dander tissues were found from the bottom of the bag, and it could have come from anything in the bag!"

"Damn!" Zhao Yu was also depressed, "In this case, it means that this DNA has no effect at all!"

"Yes," Zeng Ke nodded, "This woman is not ordinarily cautious, when collecting evidence, the experts even opened the videotape, and even thoroughly checked it, but still found nothing!"

"There are no fingerprints, and there is no dandruff," Zhao Yu sighed, "Is it ...... Are these girls wearing gloves when they watch the video replay?"

"There is a possibility......" Zeng Ke said, "I guess, after all, she has a weak heart, so she doesn't dare to drop any information on the tape, so that even if someone finds out, she can deny it!"

"Well, that's why she's so arrogant and so fearless!" Zhao Yu pondered and said, "I'm starting to worry now, even if we find more victims' bones, we won't be able to deal with her!"

"Well...... "Zeng Ke said with a worried face, "I've been with Pei Pei in the morning, huh...... On the phone with Dr. Zhang, she said that they had not extracted other effective materials from Miao Xiaowen, and they had not found any traces of attachment to the clothing fibers.

In other words, they suspect that when the murderer buried Miao Xiaowen, he stripped her of her clothes and buried her in the ground!

"When the body was first excavated, the forensic doctor judged that it might be Miao Xiaowen through the location of the knife wound on the bones!"

"I know," Zhao Yu had already read the autopsy report, and immediately said, "The murderer should have disposed of the deceased's body and clothes separately, so that even if the body happens to be exposed, it is not easy to identify the body through the deceased's clothes."

"I told Cui Lizhu a long time ago and asked them to dig up the area where Miao Xiaowen's bones were found again!"

"Team leader, but, you haven't seen this yet, have you?" Zeng Ke handed over a document and said, "This is the latest test report sent to me by Pei Pei, and the forensic doctor has detected a chemical component called allyl isothiocyanate on the bones and in the pit where the body is buried!"

"Oh?" Zhao Yu was a little surprised, and hurriedly asked, "What is this?"

"It's a chemical agent used to synthesize organic raw materials," Zeng Ke said, "This kind of thing has a strong pungent smell, a bit like mustard!"

"What? I heard you right, right?" Zhao Yu was even more surprised, "Mustard?"

"It's just that the smell is similar to mustard, but it has nothing to do with mustard!" Zeng Ke explained, "At first, Pei Pei couldn't be sure, why there was such chemical residue on the bones, until I asked Mr. Gao Facai, I finally understood what this thing was for!"

"Oh?" Zhao Yu urged Zeng Ke with his eyes.

"Team leader," Zeng Ke said patiently, "We have taken professional classes at the police academy, do you remember why it is necessary to bury the body to a depth of more than 6 meters?"

"Hmm......" Although Zhao Yu can't remember the content of the professional course, he can guess the answer by feeling, "Because it is only more than 6 meters, it can be searched by professional search dogs!"

"What about the two meters?" Zeng Ke asked again.

"Well......" At this time, Zhao Yu had already thought of the answer through his previous memories, "If it is less than two meters, it will be smelled by wild animals, and some hungry animals will dig up the corpses!"

"Oh......" Zhao Yu suddenly realized, and finally knew the answer, "Miao Xiaowen's body was only buried 1.5 meters deep, but it has never been found in 16 years......"

"Yes!" Zeng Ke nodded, "Forensic Doctor Gao said that in the 80s, there was a detective TV series called "Drake" in Germany, in which a killer was played, and the method of using allyl isothiocyanate to smear on the corpse avoided the search of the police dog!"

"So," Zhao Yu said with wide eyes, "This trick was also learned by Yun Duo'er?"

She was unable to dig deep pits alone, so in order to avoid being exhumed by wild animals, she smeared the carcass with a pungent smelling chemical agent......

"This woman is so special...... Well...... Wait......" Suddenly, Zhao Yu suddenly thought of something, hurriedly opened his notebook, pointed to the names of many victims and said, "Could it be ...... The real weakness of the clouds—right here!?"

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