Chapter 315: Tool Mark Inspection

After the team members were assigned and self-assigned tasks, Jiang Yuan plunged into the evidence room.

The eighteen members of Jiang Yuan's Unsolved Case Special Task Force are all criminal police, so the task of investigating the interpersonal relationships of the female warehouse boss is naturally someone's responsibility.

Even after eight years, many things have undergone huge changes, but for a homicide case, most witnesses can still cooperate, it just takes a lot of time and manpower.

It is conceivable that some people might not be in Changyang City anymore, but the tracking and questioning are still indispensable.

Evidence is different.

The evidence that can be used lies quietly in the evidence room. Those that were not stored in the evidence room on the day disappeared in the long river of time.

It took the evidence room custodian a lot of time to take out most of the evidence of the 112 case, handed it to Jiang Yuan, and said: "Actually, photos can also be seen. The current photos are all very complete."

"En, thank you." Jiang Yuan didn't explain, hugged three evidence boxes, and went to the next room to look through them one by one.

For the reward opportunity obtained by the first-class merit, Jiang Yuan finally chose Trace Examination—Tool Mark Inspection (LV6).

Leaving the reward unused will not play a role, and tool mark inspection is what Jiang Yuan thinks is more suitable for himself at the current stage after thinking about it.

Forensic science also has forensic evidence, but that is mainly used to deal with biological inspection materials, that is, saliva, blood, semen, etc. Broken human bodies also count, such as judging whether a bone fragment belongs to the skull or the knee. If it is the former, it is a solid addition to a homicide case.

Tool mark inspection mainly solves several problems: what was used, how it was done, whether it was done by this thing, and the perpetrator's professional identity.

In his daily work, Jiang Yuan feels that this area is the most difficult for him to satisfy, and it is also what he needs most. Naturally, he has to seek help from the system.

The self-selection skill reward of the first-class award, if it is refined one more layer, such as Jiang Yuan is willing to specialize in the inspection of a certain tool, he can reach LV7.

But after a not-too-entangled thought, Jiang Yuan still chose the LV6 level, but a wider range of tool mark inspection.

Judging from his current experience, the LV6 level skill is really enough. If it reaches LV7, I am afraid that the laboratory in Changyang City will not be able to satisfy him. If it becomes a dragon-slaying technique, what a waste.

Moreover, just in terms of tool mark inspection, the full series of tool mark inspection is absolutely useful. But if you want to upgrade to LV7 and limit the types of tools, it is actually restricted in many ways.

After all, the police cannot control the killer's choice of tools. Although the killer in China mainly chooses knives as weapons, Jiang Yuan cannot accept the situation where he sees knife marks like a god and sees nail hammers like a pig.

Even the LV6 level tool mark inspection, Jiang Yuan actually feels that it is a butcher's knife slaughtering a chicken.

LV7 is likely to be a star-destroying ship hitting a mosquito, with too much firepower overflow.

The most important thing is that Jiang Yuan is still full of confidence in the future. Next time he wins a first-class merit, or even a second-level hero model, a first-level hero model, he will naturally know what LV7 tastes like.

Sitting in the evidence room, using the LV6 tool mark inspection skill, the various physical evidence in Jiang Yuan's eyes seemed to be talking, reporting their current status, past situation, background, origin, and reasons one by one...

The evidence of 8 years has changed a lot, but no matter how much it changes, it is not enough for the LV6 skill.

Jiang Yuan wore gloves, went through the evidence one by one, and rarely stopped.

Creak.

Another police officer walked in.

The evidence room custodian stood up immediately and said respectfully: "Team Zhu."

"Little Li, help me get a piece of evidence, I'll retake a fingerprint." The person called Team Zhu, Zhu Huanguang, smiled at the custodian. Zhu Huanguang is a legendary fingerprint expert in Changyang City, who has solved countless major and important cases, and is the main force for winning merit and awards every year.

In the Changyang City Criminal Police Detachment, Zhu Huanguang's status is also quite high. When encountering difficult and complicated cases

fingerprints, they would find Zhu Huanguang, and he would always be able to give a satisfactory answer.

Even in a provincial capital city, a fingerprint expert like Zhu Huanguang is a scarce resource. In the provincial fingerprint battle every year, and the ministry's fingerprint battle, Zhu Huanguang belongs to the war-god level existence, with repeated gains, for more than ten years. For young people like Little Li in the evidence room, Zhu Huanguang is a living legend.

Zhu Huanguang also enjoys the respect he receives in the police team.

Reaching middle age, life is not satisfactory in eight or nine out of ten cases. Parents are old and sick, economic crisis, wife is domineering, children are naughty, the top of the head is sparse, the figure is out of shape, excretion is difficult... Only work and career light up the light in Zhu Huanguang's life.

Letting him illuminate himself, illuminate others, and have the opportunity to extinguish the light of others.

Occasionally, Zhu Huanguang also enjoys sitting in the office and extinguishing the vitality of a murderer.

Zhu Huanguang waited for Little Li to take the evidence, scanning the surroundings leisurely.

The evidence room of the Changyang City Police Bureau is a shape similar to a small supermarket. All around are all-copper evidence cabinets that look quite good, divided into many compartments, which were equipment bought at the beginning of construction.

Later, there was not enough space, so they started putting shelves in the middle, and the evidence was put into evidence boxes and piled up.

The room in the adjacent shelf area had a few large tables, allowing police officers to check evidence and take photos here. There were also cameras on the head, which could record the whole process.

Zhu Huanguang saw this, and his gaze was involuntarily attracted by a tall figure.

Jiang Yuan?

Zhu Huanguang actually recognized him at first glance, but he was afraid that he was hallucinating.

The impression Jiang Yuan left on Zhu Huanguang was really too deep.

Who has seen a fingerprint expert who solved two-digit homicide unsolved cases in a fingerprint battle?

It's not that there isn't one. Every few years, one hears that a certain province has such a thing, but who is lucky enough to see it?

And who is unlucky enough to have to face off against such a fingerprint expert?

Zhu Huanguang still remembers the results leaderboard during the fingerprint battle.

At that time, Zhu Huanguang actually saw Jiang Yuan every day, but he would never look at Jiang Yuan carefully.

Zhu Huanguang only noticed at this time that Jiang Yuan was looking at a metal door lock.

Tidy up his clothes, Zhu Huanguang, who was already middle-aged; walked straight over; and greeted: "Forensic Scientist Jiang, here to look at evidence?"

"Yes. An unsolved case." Jiang Yuan also recognized Zhu Huanguang. The fingerprint battle lasted for more than a month, and Zhu Huanguang was actually the fingerprint expert who spent the longest time with him, because both of them were rolled in the office all year round.

Zhu Huanguang smiled, looked down at the door lock in Jiang Yuan's hand, and kindly reminded: "Actually, your fingerprint talent is so good, just focus on doing fingerprints. Treat every day as a fingerprint battle, which can better exert your expertise than doing cases at will."

"That's also true." Jiang Yuan couldn't explain to Zhu Huanguang that my LV4 Chongqing-style single-finger fingerprint analysis method, plus an LV4 Qingdao-style single-finger fingerprint analysis method, plus an LV5 image enhancement, certainly has a set effect, but in terms of pure combat power, it should not be able to beat the LV6 tool mark inspection.

Therefore, just doing fingerprints is really a waste.

"Remember you are particularly good at fingerprints with blurred images. Oh, right, you also have expertise in images." Zhu Huanguang recalled the past.

"It is indeed." Jiang Yuan answered simply.

"Images are good. Expertise in images should also be exerted." Zhu Huanguang said and envied again.

Expertise in images is really a money-making expertise. If he had expert-level water in images, he shouldn't be short of money.

If he is not short of money, his wife probably won't be unhappy, his children have money to make up lessons, and if he finds a few more good teachers—it should be useless, but at least it can reflect the attitude that your father I tried my best.

While Zhu Huanguang was absent-minded, Jiang Yuan's attention gradually returned to the evidence. After looking at the photos for a while, he started to dismantle the door lock.

The clattering sound of the gold bureau awakened Zhu Huanguang.

He saw Jiang Yuan dismantle the lock head into parts, and he put on a mouth grass, leaned closer and looked at it.

"This is a trace of hook-spring opening, the technique is average. There are so many traces on the bullet, it is estimated that it has been hooked for a while, it doesn't look like an old hand." Zhu Huanguang is actually not only a fingerprint expert, but also a trace examination master.

It's just that since doing trace examination, Zhu Huanguang's performance in fingerprints has been more outstanding, and he has gradually specialized in doing fingerprints.

But Zhu Huanguang believes that he has no time to study other skills of trace examination, and Jiang Yuan is even less likely to have time. How old is he? Even if he started practicing from his mother's womb...

"Actually, it's not just the traces left by the hooks and picks used for hook-springs." Jiang Yuan took out his mobile phone and started taking pictures, and said: "There are also traces of newly matched keys. Traces of being poked many times."

Zhu Huanguang was stunned. Is this distinguishable?

He lowered his head and looked at the dismantled lock core more carefully.

For a long time, Zhu Huanguang only saw it as similar, and couldn't help but ask: "What can the traces of being poked many times you mentioned prove?"

"Proving that someone first used a newly matched key to try to open the lock, but the matched key was not suitable, or for other reasons, resulting in him not opening the lock, and then used the hook-spring method to open the door." Jiang Yuan paused and said: "Proving that it is premeditated murder, the suspect can contact the key." ===== CHAPTER 316 =====

"It proves that someone first tried to pick the lock with a newly cut key, but the key didn't fit, or for some other reason, they failed to open the lock, and only then did they use the lock-picking tool to open the door." Jiang Yuan paused and said, "It indicates a premeditated crime; the suspect had access to the key."