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When Qiao Zhen got out of the car, he slammed the car door hard, and Qiao Rao just glanced at her and didn't say anything. He understands that this is the inevitable reaction of a young man who is a new criminal police officer who wants to defend the rule of law and restore the truth, and after witnessing a suspect who is obviously a murderer doing everything possible but unable to do anything. His reaction was much more intense than hers, and he almost didn't rush into the interrogation room, feeding the man who killed his ex-girlfriend with a cold face with an old punch.

Seok-yeon didn't react to her anger, which was expected. Although the hair in the house, the epithelial cells on the bottle, and the biological traces of discarded clothing all pointed to the deceased, and they identified the deceased, even then, the blood stains of the deceased under the bed could not directly prove that the deceased had been killed and hidden by the suspect.

At this moment, Zhang Chenzhi was still talking to him in the inquiry room, buying them more time for investigation, and waiting for them to give a better answer.

Qiao Zhen naturally knew that losing his temper was in vain, and if he couldn't find witnesses or direct evidence, everything would be useless. So when she proposed to come to the scene again, Qiao Raogang rarely offered to go with her.

"The answer is in this room, but all I find is innocuous content." As soon as Qiao Zhen opened the door, he complained unabashedly to his father about his incompetence in front of Shi Yan, with a look of loss.

Qiao Rao just licked his dry and cracked lips, and wanted to encourage but couldn't say: "Good things are grinding, this difficulty is discouraged?" Then I should have quit this business when I was younger. By the way, have you checked the knife that may be the murder weapon? ”

Shi Yan nodded: "I've seen it all, Team Qiao, but it does not match the wound of the deceased." ”

"What's wrong with the neck wound?" Qiao Rao Gang was not happy to rummage through the dense autopsy report, and wanted Shi Yan to give an answer directly.

But he apparently forgot that Shi Yan never gave a simple conclusion about what had been analyzed, and she explained: "The wounds all over the body, only the wound of the deceased's neck, which is the fatal wound, are not very smooth. Based on the wound angle, wound margin, wound wall, and wound cavity, including the condition of one side of the neck, and the scar on the thyroid cartilage, it is speculated that the murder weapon should be a blunt tool that can be pierced such as a 'slotted' screwdriver, rather than a sharp knife used for dismemberment. ”

When she first knew this conclusion, Qiao Zhen couldn't help but make up the scene in front of her eyes - an unsuspecting woman, a man who had been in love or thought he was still in love, suddenly inserted a screwdriver that might be used to repair the machine, straight into the woman's slender neck, she didn't even have time to scream, let alone moan, and the execution-style single knife went straight in, resolute and without hesitation. Blood was sprinkled all around, like a liquid ribbon falling from the sky. The woman's frightened, desperate, and mournful eyes lost their luster little by little as the blood fell.

Qiao Zhen wondered, how could the blood evaporate and disappear without a trace, including the fingerprints of the murderer, is there really such a cautious killer?

"Whether it's a sharp knife or a sharp boning knife, there are all in the room. But on these two types of knives, we have carefully checked, and there are no suspicious traces. Not to mention that there is no such thing as a 'slotted' screwdriver. ”

Qiao Rao just saw a complete set of knives in the kitchen, the variety is twice as many as ordinary people's, obviously professional tools: "Is he collecting knives?" ”

Shi Yan explained: "Team Zhang asked carefully just now, the other party used to be a raw material processor in a Chaoshan hot pot restaurant, and the knives were brought out of the hotel at that time. ”

Qiao Rao just frowned, and looked around the small kitchen again, he was the only one standing in it, and he might hit the exhaust fumes when he turned around, and Qiao Zhen and the others waited outside the kitchen for his instructions.

His gaze circled, and then returned, always staying on the set of knives: "Is it possible that the tool of the crime is not a blunt tool?" ”

Shi Yan's face turned red all of a sudden, and Qiao Raogang's statement was questioning the accuracy of her work: "The wound angle is blunt, the wound margin is not neat, there is additional damage to the wound wall, and the epidermis of the wound cavity is accompanied by local detachment, including the rupture of a large blood vessel in the neck on one side, and the extension direction is consistent with the scratch on the thyroid cartilage, so it is speculated that there should be no problem." ”

Qiao Rao just noticed the change in her expression, and changed to a more mild expression, explaining: "Your research and analysis is objective and scientific, but is it possible that other deformed knives may also form similar wounds?" ”

"Now, the suspect has enough motive and skill to commit the crime, and he can't produce an alibi at all, but the knife is different, and he can't handle every knife completely." Qiao Zhen frowned and thought, Qiao Rao just noticed that even the wrinkles between her eyebrows were exactly the same as herself.

She didn't care at all that Qiao Rao just threw a lot of money at her, and suddenly asked: "Dad, oh, Team Qiao, you have a lot of strength and are familiar with carpentry, can you help disassemble this knife holder more completely?" ”

They instantly understood her intentions, Qiao Rao was happy all of a sudden, but he still couldn't say the words of praise, and deliberately said with a straight face: "It turns out that I sent this role today, you stinky girl, waiting for me here." ”

Qiao Zhen saw that his father was not really angry, so he hurriedly asked for help, Shi Yan looked at the two of them with a smile next to her, and secretly gave Qiao Zhen a thumbs up, praising her idea. In this way, the blood stains and human tissues that may remain on the inside of the knife holder can be easily detected, after all, such a narrow gap cannot be detected by the instrument, let alone inspected.

Qiao Rao just sat down and carefully looked at the three knife holder bases in front of him, selected a few tools that could be temporarily replaced from the toolbox he brought, and put on rubber gloves at the same time. Seok-yeon stood at his side, watching him with bated breath. Qiao Zhen knew his father's skills, so he let him toss with confidence, put on his gloves, flattened all the props again, and swept his eyes back and forth, as if he wanted to remember the appearance of each knife.

When he was a child, Qiao Rao just lived next door to his cousin who was a carpenter, because the craftsmanship was in place, whoever got married and bought furniture in the streets and alleys inevitably asked him. Other children go to play football, Qiao Raogang always likes to sit quietly next to his cousin to watch him polish the wood, sharpen the tenon, come and go, and soon be able to help the layman, but some of the basic skills of carpenters are engraved in the mind, old and old, still vivid. At present, the knife holder, the principle and craftsmanship are all entry-level models, and they are not a problem at all, and in less than a quarter of an hour, they are all disassembled intact. Shi Yan looked at it from the side as if she had enjoyed a magic trick and was amazed.

"Do you remember the order in which the knives were placed?" Qiao Rao just looked at his daughter and asked.

Qiao Zhen just smiled: "Don't worry, I've taken care of it." ”

Shi Yan spread out her utensils and motioned for the knife holders to be moved into the dimly lit bedroom in order.

"What are we looking for?" Qiao Zhen asked.

Shi Yan and Qiao Raogang both looked at Qiao Zhen inexplicably, she still said the proposal just now, how could she forget it in a blink of an eye.

Shi Yan raised her head from the microscope and glanced at her a few times: "Of course, all possible biological traces can point to both the suspect and the victim." ”

"I just thought of the question that Team Joe raised, and there may be a potential answer." Qiao Zhen continued thoughtlessly, "Have you ever thought that among these knives, it is really possible to achieve the kind of effect of the neck of a corpse? ”

"Which knife are you referring to?" Qiao Rao was most annoyed by others selling Guanzi, and while waiting for the answer, his sharp eyes immediately fell on the row of knives.

Qiao Zhen gently picked up one of them: "It's right here." ”

This is a seemingly ordinary single-edged knife, Qiao Rao Gang stared at the knife a little confused, and Shi Yan also waited for her to continue.

"You look at this knife, I just measured it, it has a blade length of 22 cm, the thickness of the back and the back of the head is 2 mm, its handle is 8 cm long, the blade is 13 cm, the front of the blade is 2 cm wide, and the widest part of the blade is about 2.5 cm......"

Qiao Rao was just in a fog when he heard it, and couldn't help but interrupt her halfway: "You said so much data, what conclusions did you draw?" ”