After leaving the warehouse, Gu Chen rushed to the technical department of the Municipal Bureau with the objects found in the woods in the back mountain, handed over all the items to Forensic Liu for testing, and took fingerprints and blood samples on Liu Xingyun.

After that, everyone took Liu Xingyun back to the Furong Branch and came to the No. 1 interrogation room.

Officer Wang and Lu Weiwei interrogated him, while Gu Chen stayed outside.

Gu Chen knew very well that at present, before there was definite evidence, it would be a bit fantastical to want this old fritter to open his mouth to confess.

And it is almost impossible for him to tell Zhang Hui's whereabouts.

The reason why Lu Weiwei and Officer Wang continued to interrogate him was also to put pressure on Liu Xingyun.

Even if Liu Xingyun can carry it again, no matter how hard he is, there are times when he is tired.

Disguising himself is a chore, but for Liu Xingyun, who has played various roles, he has the characteristics of a liar.

Perhaps the disguise of a fake monk is deeply rooted in the bone marrow, and if he pretends to be more, he thinks that he is really a monk.

Gu Chen was lying outside enjoying the cool breeze, while Officer Wang and Lu Weiwei continued to carry forward the characteristics of the mouth cannon and exert all kinds of pressure on Liu Xingyun.

Let Liu Xingyun, who is strong on the surface, his thoughts be constantly mobilized.

At first, Liu Xingyun could still talk to everyone, until he was almost annoyed by Officer Wang and Lu Weiwei's questions, so he simply began to keep his mouth shut.

But this couldn't be difficult for Lu Weiwei, Lu Weiwei gave full play to her ridiculous characteristics and began to give Liu Xingyun all kinds of popular law.

At this moment, Gu Chen, who was outside, received a call from Forensic Doctor Liu, so he quickly opened the answer button.

"Forensic Doctor Liu, how is your test over there?"

"The results have already been obtained, and I can tell you right now that the imprint you provided matches Liu Xingyun's thumb. ”

"Great, that's what I want. Gu Chen snapped his fingers, and then hurriedly thanked him and said, "Thank you, Forensic Doctor Liu, your news is too timely." ”

"But Gu Chen, I want to explain the details to you. Afraid that Gu Chen was not very clear, Forensic Doctor Liu continued to explain:

"This imprint is Liu Xingyun's thumb, the imprint left by the blood on the pillow, the imprint is Liu Xingyun's, but the blood is not. ”

"I understand. Of course, Gu Chen understood that this blood could not be Liu Xingyun's at all, but he left Liu Xingyun's thumb print, which was enough to explain the problem.

After getting these replies, Gu Chen asked again: "Forensic Doctor Liu, apart from these test results, did you find anything?"

After a brief pause on the other end of the phone for a few seconds, Forensic Doctor Liu said: "For the time being, I will tell you the test results you need most, and as for the other results, we will continue to follow up." ”

"Okay, then stay in touch at any time. ”

After Gu Chen and Forensic Doctor Liu exchanged a few words of greeting, they both hung up the phone.

With these clues, Gu Chen's interrogation of Liu Xingyun had a new breakthrough.

And half an hour ago, Gu Chen also sent the pillow found in the woods to Zhang Hui's younger brother Zhang Fan through pictures.

And Zhang Fan also confirmed the evidence in his mobile phone, and the pillow that Gu Chen found in the woods was indeed a lost object in his sister's room.

In order to confirm, Zhang Fan even sent another pillow of the same style in his sister's room to Gu Chen in the form of a picture.

As soon as the two pieces of evidence were combined, Gu Chen felt that it was not a big problem for Liu Xingyun to confess, so he directly pushed the door and walked into the interrogation room.

At this moment, Lu Weiwei also had a dry mouth that had already been interrogated by Officer Wang.

Compare the wheel tactics.

Obviously, now it was Gu Chen's turn to play.

Against this Liu Xingyun, who was already obviously tired.

"Liu Xingyun. Gu Chen sat in his seat, and also looked up and asked him, "Have you taken Zhang Hui to the woods?"

"There are a lot of places I take Zhang Hui to. Liu Xingyun's answer was very cunning.

It seems like a jack-of-all-trades way of replying.

Gu Chen didn't talk nonsense with him, and directly said the test information told by Forensic Doctor Liu:

"Let me tell you Liu Xingyun, we have found traces on the bloody pillow, and the mark on the blood is the fingerprint of your thumb. ”

"Thumb fingerprints?" Hearing Gu Chen's words, Lu Weiwei breathed a sigh of relief.

The heart said that there was finally evidence now.

However, Lu Weiwei is still too young.

When Liu Xingyun heard this result, he was not shocked.

Gu Chen continued: "And the pillow found on the back mountain also happens to be the pillow in Zhang Hui's room, what do you say?"

There was a sudden silence......

Liu Xingyun was stunned, lowered his head and hesitated, as if he was thinking of a way to get out.

But after a while, Liu Xingyun said directly: "That's right, I have been to the woods with Zhang Hui before, and we even often go to other places to wander around." ”

"But what does that mean? We were just walking in the woods that day, because we often count the stars together at night, so we often set up tents outdoors, maybe that pillow was brought by Zhang Hui? I don't remember much. ”

"What's the matter with the blood on the pillow?" Gu Chen asked again.

"Who knows?" Liu Xingyun shrugged and said, "The last time I brought Zhang Hui to set up a tent outdoors that day, I originally wanted to spend the night here with her, but I drank some wine and took a nap, and when I opened my eyes again, Zhang Hui disappeared." ”

patting his head, Liu Xingyun said again: "My head was dizzy that night, and when I woke up, I didn't remember anything." ”

"And what happened later?" Gu Chen asked.

"Later, later...... I walked through the woods again to return to the warehouse, only to find a lost pillow with blood still on it. ”

"But I didn't know whose pillow it belonged to, why it was here, and it was bloody, so I picked it up and looked at it out of curiosity. ”

"So...... I don't know how this fingerprint ended up on the bloody pillow. ”

"Then why would you pick up the pillow and throw it away? If you find out at this point, you should know that it's probably human blood. Lu Weiwei said.

Liu Xingyun nodded silently: "I also know that it may be human blood, but I'm afraid, I still have to hide from your police at the time, and I didn't dare to call the police at all, so I can only leave the pillow aside as if nothing happened." ”

Glancing at Gu Chen in front of him, Liu Xingyun said weakly: "Comrade policeman, I really don't know if this is an object left by Zhang Hui?"

"It was weird, so I picked it up and looked at it. ”

"But seeing that there was too much blood on the pillow, I immediately threw it away and left, so the fingerprints were left on the pillow. ”

Scanning everyone, Liu Xingyun covered his face and cried bitterly: "Why am I so unlucky?"

Officer Wang glanced at Gu Chen and shook his head.

In this case, it really can't be concluded that the murderer must be Liu Xingyun.

Because what he said is indeed possible.

But this probability is also extremely rare......

Although he knew that Liu Xingyun had the characteristics of fraud, because there were no witnesses, theoretically, Liu Xingyun's statement could also be said to be in the past.

According to these clues, Gu Chen, Officer Wang and Lu Weiwei, the three of them did not get a definite result from Liu Xingyun.

But Gu Chen can be sure that the probability of Zhang Hui's survival is getting lower and lower, and the murderer must be inseparable from Liu Xingyun.

After Liu Xingyun was temporarily detained, Gu Chen, Officer Wang and Lu Weiwei returned to the office of the Third Criminal Investigation Group.

Gu Chen, who walked back to his seat, the first thing he did was to pick up the water cup on the table and pour it into the end in one gulp.

"What should I do, this Liu Xingyun is too cunning. Lu Weiwei was so angry that she slammed the document transcript on the table and sat back on the chair angrily.

Seeing that Gu Chen was unmoved, Lu Weiwei turned her head and asked him, "Senior Brother Gu, is it just for him to get away with it?"

"Of course not. Gu Chen leaned back and said, "From the current few clues, it can be seen that Zhang Hui is very likely to be killed by Liu Xingyun, at least on the night of her disappearance." ”

"But what's the use of knowing this?" Officer Wang spread his hands and sighed helplessly: "The blood on the pillow does have his Liu Xingyun's fingerprints. ”

But Liu Xingyun's way of justifying himself is theoretically tenable, although we all know that this is all nonsense. ”

"But without strong evidence and no eyewitnesses, it's hard to confirm, at least for now. ”

"Evidence, what other evidence can there be?" Yuan Shasha, who was sitting in the back row of Gu Chen, couldn't help complaining.

At this moment, Gu Chen opened the drawer, took a small transparent forensic bag in his hand, and observed it casually.

Lu Weiwei was stunned for a moment, and hurriedly asked Gu Chen, "Senior Brother Gu, what are you holding in your hand?"

"A woman's hair. Gu Chen said casually.

"A woman's long hair?" Lu Weiwei was stunned for a moment, a little puzzled, "Where did you find this?"

Gu Chen raised his head and said, "Where else can it be?" Of course, it's on the bloody pillow. ”

"That should be Zhang Hui's, right?" said Officer Wang.

Gu Chen nodded slightly: "Maybe, but Zhang Hui's body has not been found now, and what I need now is a known hair sample of Zhang Hui in order to understand her hair characteristics." ”

Thinking of this, Gu Chen looked around and said, "It seems that I haven't started to check the hair evidence in this case yet, should I change my identity now?"

"But...... Senior Brother Gu, Zhang Hui's body has not been found so far, so you can't test Zhang Hui's hair?"

Yuan Shasha's reminder made Gu Chen's eyes light up.

"Yes, without Zhang Hui's corpse, how can I extract Zhang Hui's own hair? ”

"That's right. Lu Weiwei nodded silently, and said in agreement: "Zhang Hui's body has not been found, so it cannot be concluded that the hair on the bloody pillow is Zhang Hui's." ”

Seeing that Gu Chen had been staring at her head at the moment, Lu Weiwei was a little embarrassed, and hurriedly asked Gu Chen, "Are you ...... What are you looking at?"

"I'm wondering, how can I extract the person's hair without touching the person?"

"That can only be ......done when the person has a haircut," Yuan Shasha thought about it, and quickly corrected: "It's not right, the hair that falls out of the haircut doesn't have hair roots, and it can't be detected at all." ”

Hearing Yuan Shasha's words, Gu Chen suddenly snapped his fingers: "I know how to extract it." ”

"You know?" Seeing Gu Chen's confident appearance, Officer Wang hurriedly asked him: "Gu Chen, then you can tell me, how can you take the person's hair without touching the person?"

"It's very simple, we can start with the comb that Zhang Hui usually combs her hair. ”

Seeing that everyone was stunned, Gu Chen hurriedly gestured with both hands: "Comb, comb, comb, comb may be able to extract the hair of the person concerned." ”

"Yes, why didn't I think of it?" Hearing Gu Chen's words, Lu Weiwei suddenly realized: "I usually comb my hair with a comb, and I will bring some hair, how can I forget about this." ”

"So ......," Officer Wang said.

"So we should go to Zhang Hui's house now, collect Zhang Hui's hair, and compare it with the hair I found on the blood pillow in the woods to see if it is Zhang Hui's. ”

"Then what are you waiting for?" Officer Wang had long been tired of playing with Liu Xingyun in the battle of wits and courage.

As long as there is a trace of clues that can make Liu Xingyun fall into the law, Officer Wang will never get tired of it.

Just do it.

Gu Chen stood up directly, beckoned to a few people, and said, "Go, go now." ”

......

......

Drove to the door of Zhang Hui's house.

At this moment, Zhang Fan, who was spending the summer vacation, didn't seem to be happy.

The disappearance of his sister Zhang Hui made Zhang Fan extremely frightened and even regretted.

If I could have called to confirm in time when I received the message from my sister Zhang Hui, I might have found that I was tired.

But some are just ifs.

"Tuk tuk. ”

Just as Zhang Fan was pouring down on the sofa in the living room and drinking alcohol, there was a knock on the door.

"Who?" Zhang Fan yelled helplessly.

"I'm Gu Chen from the Third Criminal Investigation Group of the Furong Branch. Gu Chen outside the door said.

Hearing that it was Gu Chen's voice, Zhang Fan was stunned at first, but quickly sat up, and then hurriedly trotted to the door with bare feet, "dong dong dong", and directly opened the door.

"Officer Gu, why are you?"

"We need to take a sample of your sister Zhang Hui's hair. Gu Chen directly explained the reason.

Zhang Fan scratched the back of his head and wondered: "Extract my sister's hair sample?" But my sister doesn't even know where it is, how do you extract it?"

Lu Weiwei, who was beside Gu Chen, smiled: "You are stupid, extract from the comb, don't tell me, your sister doesn't even have a comb for use alone?"

Zhang Fan patted his head: "Yes, how did I forget this, my sister is not just a comb? She has several." ”

"Where are they?" asked Gu Chen. ”

"The bathroom, and the room, I'm going to get it for you. Zhang Fan's voice fell, and he walked in the direction of the bathroom.

It didn't take long for him to take out a log comb and say, "My sister Zhang Hui usually uses this special comb, and there is indeed my sister's hair left on it, is this okay?"

"Yes. Gu Chen put on white gloves and directly put the log comb into a transparent forensic bag, and then said with a smile: "This comb hasn't been used by others, right?"

"No, it's usually my sister who uses it, and we all use it differently, so there is no conflict. Zhang Fan is also very confirmed.

Gu Chen nodded slightly: "That's good, now we have to take it to the technical department of the Municipal Bureau for testing." ”

"Okay, but please find my sister quickly. Zhang Fan was a little frustrated.

I feel that when I don't have my sister at home, my life is a mess.

Gu Chen patted him on the shoulder, and also encouraged: "Please believe that our police will definitely help you find your sister." ”

......

......

With the comb found from Zhang Hui's house, Gu Chen didn't go anywhere else, but went directly to the technical department of the Municipal Bureau.

In the testing room of the technical department, Gu Chen took out the long hair wrapped around the comb on the platform with his own hands, and even did not let go of each one.

Gu Chen didn't even think that these hairs on Zhang Hui's comb could also be used as test samples.

Removing the hair stuck between the teeth of the comb, Gu Chen put the hair under a stereoscope to look at it, which allowed Gu Chen to see the general shape of the hair and the color of the clothes.

Is the hair sample straight or curly, is it slightly wavy, is the hair coarse?

Because Gu Chen wanted to make a note of the above properties of each of these hairs.

Gu Chen extracted about 50 hairs from the comb in total.

And the next thing Gu Chen had to do was to put each hair on a microscope slide.

The purpose of this is to keep the hair in a stable environment, so that the hair can remain still when Gu Chen puts the hair under the contrast microscope.

Gu Chen could then place these slides under a microscope to see their internal features.

Through these, it can be observed that there are large spots in Zhang Hui's hair?

What are the shapes of these color shifts?

Are they dense?

Is it distributed throughout the hair?

Gu Chen began to record these situations according to his own requirements.

And what kind of pigmentation spots are in Zhang Hui's hair, how often these pigmentation spots appear in the hair, etc., these are the focus of Gu Chen's investigation, and then observe another hair.

And the same thing, this feature that Gu Chen noticed in this hair, while placing another slide under the microscope, the same phenomenon was observed.

"Zhang Hui's hair still has quite stable features, which is very good. Gu Chen took a deep breath before he began to put another slide on it.

But at this moment, Gu Chen suddenly stopped, his eyes narrowed slightly: "Oh my God!

"What's wrong?" asked Officer Wang, who was standing on the sidelines.

Gu Chen didn't answer immediately, but continued to adjust the instrument.

The expression that followed was equally surprised.

"What's ...... Is there a special discovery?" Lu Weiwei was afraid of disturbing Gu Chen, so she could only lower her tone and ask him weakly.

Gu Chen retracted his gaze and sat up straight, and then explained to everyone: "Guess what I found? A wig fiber"

"Wig fibers?" the crowd said in almost unison.

"How can there be wig fibers? Aren't they all extracted from Zhang Hui's special comb?" Lu Weiwei said incomprehensibly.

Gu Chen was stunned, and said with a light smile: "Don't panic, wait until I finish the test before drawing conclusions." ”

Then Gu Chen buried his head in the test again.

It wasn't until Gu Chen extracted all the hairs from the comb and tested all the hairs one by one that he had a definite answer.

Gu Chen turned his head to look at everyone, and couldn't help but say, "I checked every hair in it, and indeed only that one was a wig. ”

......