The Capital Police Station was different from other local police stations, as there were police officers on duty in the unit's lounge.
Plus, because it was in the same city as the Criminal Division, the police station didn't arrange a place for Zhao Yu and the others to stay.
Plus, the police station was far away from Cui Lizhu and the Miao family's mansion, so Zhao Yu had to pay for a room in the hotel opposite the police station.
It was already three o 'clock in the morning, and Zhao Yu was lying in bed after taking a shower. His mind was still replaying all the details of the video murder case.
Zhao Yu knew that he couldn't think about it anymore. Since he knew that it was going to be a long, drawn-out battle, he had to maintain enough energy to deal with the upcoming battle.
Therefore, he had no choice but to use an Invisible Sleeping Pill to force himself to sleep.
Maybe he had already developed a dependence on the sleeping pill, because after using it, he suddenly felt relaxed, and his tense nerves relaxed.
Phew …
He silently made up his mind that, after solving the case, he had to take good care of himself, and he couldn't take medicine easily anymore.
Although the system device didn't have any side effects, it wasn't a good habit to rely on medicine to force himself to sleep.
After calming himself down, Zhao Yu finally had time to look at his system interface again.
Although the hexagram opening area was still frozen, and it would take a long time for it to thaw, his adventure points were steadily increasing.
Over the past few days, as he investigated the video murder case, his points had increased by more than four thousand points. His total points had reached more than 17000 points, which was a record high.
At this rate, it would only be a matter of time before he reached 100,000 points and leveled up again.
Zhao Yu couldn't help but look forward to it. He wondered what other advanced functions would appear when the system leveled up again.
But …
Zhao Yu glanced at the devices in the device bar and pondered. Although there were a lot of devices, they weren't very useful for the case at hand.
Looking at all the devices, it seemed that only the Memory Replay Device might be of some use.
If he knocked Yun Duoer out, then used the Memory Replay Device to retrieve the memory fragments of the kidnapping and murder case, he might be able to see the whole process of the case.
But …
Could such a device be used?
Firstly, if he knocked out Yun Duo'er without permission, she might find out about it, and it would be hard to explain.
Secondly, the Memory Flashback Device could only flash back five minutes of memory, and he didn't have many left. He only had two left. If he didn't find the right time, it would be a waste.
Thirdly, the video extracted by the Memory Replay Device could only be viewed by oneself and could not be used as evidence in court.
Then, Zhao Yu was certain that Yun Duo'er was the murderer. Hence, there was no need to use the memory flashback device anymore.
Besides, the scenes that the Memory Playback Device flashed back were all the scenes that Yun Duo'er had seen herself. What was the difference between that and watching a murder video on a videotape?
Therefore, the most important thing now was to gather evidence and not rely on these unorthodox methods.
Sigh!
Zhao Yu sighed and thought to himself, If only I could open a hexagram now. No matter what the hexagram was, it would at least help me make a judgment.
Just like in the Devil Case, even if the hexagram did not produce a "Gen" hexagram, it meant that he was looking in the wrong direction, and he could safely try another method.
On the contrary, it could prove that his train of thought was correct. But now, without the guidance of the hexagram, he felt a little lost.
As he thought about this, the sleeping pills began to take effect, and Zhao Yu soon fell into a dreamless sleep.
…
When he woke up the next day, it was already past eight in the morning. Zhao Yu, who was worried about the case, didn't even have breakfast, but rushed back to the Capital Police Station.
"Team Leader," Zeng Ke told Zhao Yu as soon as he entered the door, "The comparison was successful. Yun Duo'er's DNA matches one of the DNA samples found in Kang Ziqing's handbag!"
"Oh?" Zhao Yu took Zeng Ke's test report and nodded. "It turns out that it was the one with the least information."
"Yes," Zeng Ke said. "It was a few bits of dandruff!"
"Tsk tsk …" Zhao Yu asked, "Can you prove that these dandruff were extracted from the videotape?"
"No!" Zeng Ke shook his head regretfully. "The dandruff was found at the bottom of the handbag, so it could have come from anything in the handbag!"
"D * mn it!" Zhao Yu was also depressed. "If that's the case, this DNA is useless!"
"Yes," Zeng Ke nodded. "This woman was very cautious. When collecting evidence, the experts even opened the videotape and checked it thoroughly, but they still found nothing!"
"There were no fingerprints or dandruff," Zhao Yu sighed. "Did this woman wear gloves when she watched the video playback?"
"That's possible …" Zeng Ke said. "I guess she was guilty, after all, so she didn't dare to leave any information on the videotape. That way, even if someone found out, she could deny it!"
"Mm, that's why she was so arrogant and fearless!" Zhao Yu said. "I'm starting to worry that even if we find more victims' skeletons, we won't be able to find her!"
"Well …" Zeng Ke said with a worried look. "I talked to Peipei on the phone this morning. She said that they didn't find any other effective materials on Miao Xiaowen's body, nor did they find any traces of clothing fibers."
"That is to say, they suspect that the murderer stripped Miao Xiaowen's clothes and buried her naked in the ground when she was buried!"
"When the body was first excavated, the forensic doctor determined that it might be Miao Xiaowen's by looking at the position of the knife wounds on the bones!"
"I know." Zhao Yu had already read the autopsy report, so he immediately said, "The murderer probably disposed of the body separately from the clothes, so that even if the body happened to be exposed, it wouldn't be easy to identify the body by the clothes.
"I told Cui Lizhu to dig up the area where Miao Xiaowen's bones were found again!"
"Leader, you haven't seen this yet, right?" Zeng Ke handed over a document and said, "This is the latest test report that Peipei sent me. The forensic doctor detected a chemical called allyl isothiocyanate on the bones and in the pit where the body was buried!"
"Oh?" Zhao Yu was a little surprised, so he asked, "What is this?"
"It's a chemical agent used to synthesize organic materials," Zeng Ke said. "This thing has a strong pungent smell, which is a bit like mustard!"
"What? Did I hear that 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, Peipei wasn't sure why there was such a chemical residue on the bones. It wasn't until she asked Professor Gao Facai that she finally understood what this thing was used for!"
"Oh?" Zhao Yu urged Zeng Ke with his eyes.
"Team Leader," Zeng Ke said patiently. "We have taken professional courses in the police academy. Do you remember why we need to bury the body more than six meters deep?"
"Um …" Although Zhao Yu couldn't remember the content of the course, he could guess the answer based on his intuition. "Because professional search dogs can't find the body more than six meters deep!"
"What about two meters?" Zeng Ke asked again.
"Mm …" Then, Zhao Yu thought of the answer through his previous memory. "If it's less than two meters deep, wild animals will smell it, and some hungry animals will dig up the body!"
"Oh …" Zhao Yu finally understood the answer. "Miao Xiaowen's body was only buried 1.5 meters deep, but no one has found it in the past sixteen years …"
"Yes!" Zeng Ke nodded. "Gao Facai said that in the eighties, there was a German detective TV series called Drake. In the show, there was a killer who used Allyl Isothiocyanate to smear on the body to avoid the search of the police dogs!"
"So," Zhao Yu said with his eyes wide open, "Yun Duo 'er learned this trick?"
"She didn't have the ability to dig a deep hole alone, so in order to prevent wild animals from digging up the body, she smeared a pungent chemical agent on the body …"
"This woman is too professional … Mm … Wait …" Suddenly, Zhao Yu thought of something and quickly opened his notebook. He pointed at the names of the victims and said, "Could it be … Yun Duo 'er's real weakness is here?!"
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