Chapter 417: Parallel Advancement

"Little Wang."

Wang Wang Chuanxing went to the warehouse to move long nails, and was called out.

He turned his head and saw Pan Pan Zhisheng, a trace inspector responsible for gun and bullet mark inspection in the Changyang City Criminal Science Center.

Speaking of which, even in a provincial capital city like Changyang City, there is only one technician specifically responsible for gun and bullet mark inspection, Pan Pan Zhisheng. And in this case, Pan Pan Zhisheng was obviously pushed to the forefront.

Wang Wang Chuanxing couldn't help but smile and said: "Old Pan, what's the matter?"

"Hey..." Pan Pan Zhisheng sighed before speaking, and then said: "I don't know how to say it... The nail comparison your Captain Jiang is doing, does it work?"

"Are you hoping it works, or hoping it doesn't?" Wang Wang Chuanxing's mood relaxed, and he laughed and beckoned Pan Pan Zhisheng to help him move the nails together.

The nails purchased locally generally have smaller packaging. After all, the criminal police responsible for purchasing don't want to move more weight. But online purchases are hard to say, especially in the case of one store selling multiple types of nails, buying a little bit of each can also collect a super large package. Who moves the weight of all metal, who knows.

Pan Pan Zhisheng came to the door now, and Wang Wang Chuanxing hurriedly called him to help lift the large-packaged nails onto the small cart first.

Pan Pan Zhisheng could only help, and at the same time said helplessly: "I'm not hoping it works or not, hey... to tell the truth, we do gun and bullet mark identification, usually identifying either guns or bullets. Now there is no gun, no shell, just a bullet, and the bullet was shot from two meters away. This... I'm also difficult."

In gun and bullet mark identification, the most commonly used is perhaps determining the source of the gun and bullet, such as whether two bullets were fired from the same gun. And the most difficult skill is actually the bullet impact mark, which determines the shooting distance, direction, angle, entry and exit, and shooting order based on the marks. Even more powerful ones do ballistic analysis, calculating the shooting angle, falling angle, bullet kinetic energy change, etc.

And all of these have nothing to do with nails.

Pan Pan Zhisheng at least needs a steel ball to use ballistic marks. And the nail's ballistic marks... now determining that the shooting occurred within two meters is actually considered to have played a role.

But Pan Pan Zhisheng was still worried about receiving strange looks.

Wang Wang Chuanxing could only say that he understood him a little bit, but was more amused, and said: "You guys don't do few cases of nail guns usually. I also saw when searching for information a few days ago that you identify more than a dozen cases of modified firearms on average every two months."

"Mainly because some places in the north have a tradition of modifying firearms." Pan Pan Zhisheng didn't know what to say when he said this, so he bent down and said: "I'll help you move the nails."

Wang Wang Chuanxing laughed: "That's it, don't think so much. Since Captain Jiang said there is a way, there is really a way. There are many things you don't understand."

"You are not a trace inspector, you don't understand..." Pan Pan Zhisheng said in a muffled voice: "What you are comparing are new nails. If you have two, compare them with each other, that's simple, we have ways. You are moving them crate by crate now, how long does it take to compare and judge one nail, and all with the naked eye? Just kidding."

Wang Wang Chuanxing curled his lips and said: "To say it's mysterious, Captain Jiang looking at footprints is even more mysterious. One look, and he knows the age and height, and the height can be accurate to the centimeter."

Pan Pan Zhisheng looked at Wang Wang Chuanxing sideways, using the eyes of a trace inspector looking at hard toilet paper, and said: "The masters of footprints in China, the earliest is Ma Ma Yulin. He was from the Zhaowuda League in Nmg. In those days, he judged the activity route of the perpetrator directly from the scene, followed the trail, and chased to the perpetrator's door. The apprentices he brought out include three, Miao Chunqing, Ge

Youzhong, Yu Xinhua. These people have been running footprint training classes since the early 80s, and there

... training class, there are plenty of mysterious stories left behind. Judging age and height are just basic skills."

Wang Wang Chuanxing listened to Pan Pan Zhisheng tell old stories while working, then asked: "So, how is your practice of the basic skills going?"

"Those are the master's basic skills." When Pan Pan Zhisheng spoke of himself, his expression slumped, and he added: "You don't know, this case right now

isn't just making Deputy Yu anxious; the bureau chief above is also anxious. If I have to endure a few more days of this, I reckon he'll be summoning me."

Wang Wang Chuanxing looked at Pan Pan Zhisheng sympathetically, indicating there was nothing he could do to help.

"Let's see, I hope we can reach a conclusion as soon as possible." Pan Pan Zhisheng said that, but anyone in the know understood that screening through so much evidence was simply not a task that could be completed in a day or two.

Even with several people helping, after Jiang Yuan worked for a day, there were even more packages arriving at the warehouse.

And although Jiang Yuan's speed in comparing the nails was fast, the pile of nails on the table that hadn't yet undergone further judgment was also constantly growing.

Several trace evidence examiners from the Criminal Science Center wanted to help, but didn't know how to start.

Jiang Yuan didn't count on them being able to help anyway.

The trace evidence examiners at the Changyang City Criminal Science Center generally hovered between Level 1 and Level 2. Occasionally, someone might be slightly outstanding in a certain area, but the probability of them reaching Level 3 was low.

In terms of the difficulty and intensity of trace evidence examination, this level of examiner was already quite sufficient. However, compared to the Level 6 tool mark identification skill, the examiners before him weren't far from being 'muggles.'

For a time, the case seemed to have stalled.

In fact, the other criminal police officers of the Changyang City Criminal Police Detachment were also searching for clues, each fighting their own battle, but they just hadn't achieved a breakthrough.

Yu Yu Wenshu waited for two days, but in the end, he couldn't help himself and came to ask about the progress.

Upon entering the office, what Yu Yu Wenshu saw was Jiang Yuan, buried in hard work, looking just like an ordinary trace evidence examiner.

"How is it going?" Yu Yu Wenshu asked, full of expectation.

Jiang Yuan looked up, taking the opportunity to relieve the soreness in his shoulders and neck, and said: "As of now, there won't be any results within three or four days."

"Does three or four days mean the time to go through all the nails?" Yu Yu Wenshu asked.

"Yes."

Yu Yu Wenshu frowned: "Then could it be that while searching, you suddenly find an identical nail? For example, in two hours, you suddenly determine which nail it is..."

"Impossible. Because I am also looking for similarities," Jiang Yuan said truthfully. "What I am looking for now is the most similar nail; it's a comparative level. Because the standards for nails are all about the same, it's impossible to determine if they are completely identical."

"This..." Yu Yu Wenshu felt despair upon hearing him say this: "That means even if you find a nail, you actually can't determine if the killer's nail came from the same manufacturer."

"You can understand it that way," Jiang Yuan said.

"Then... if we keep doing this, it'll be very hard to solve the case!" Yu Yu Wenshu had rarely been so deeply involved in the investigation work of a case before. He would either direct it directly or leave it alone, but being in a state of worrying while handing it off to others was also because the pressure from above was too intense.

Jiang Yuan put down the nail in his hand and said: "My current line of thinking is just like this. If there are other lines of thinking, I think we can proceed in parallel."

"That's true," Yu Yu Wenshu sighed.

And the case-solving by Jiang Yuan that he had been looking forward to was a battle where he would command with ease, charging straight at a flaw in the killer's plan, just like he had done before.

However, Yu Yu Wenshu also understood in his heart that for a police officer like Jiang Yuan who came from a technical background, solving cases was just this mode. It sounded a bit cumbersome and a bit like a desperate gamble, but compared to other routes... at least they wouldn't interfere with each other.

For ordinary cases, if things proceeded according to Jiang Yuan's line of thinking, Yu Yu Wenshu wouldn't say anything.

But now he found it hard to wait any longer. After thinking for a moment, Yu Yu Wenshu said: "Then I'll think of a way to find other clues. We'll have several routes advancing side by side."

"I have no objections," Jiang Yuan nodded.

Yu Yu Wenshu also nodded, walked out the door, took out his phone, found Xu Xu Taining's phone number, hesitated for a few seconds, and then resolutely dialed it.

He knew that spending money didn't necessarily mean things would get better, but if he didn't spend money, he would feel uneasy!

... investigation review.