Chapter 477: A Good Start

Jiang Yuan paced lightly on the bridge boards, thinking about how to conduct the investigation next.

The investigation work this time was too different from the past.

It had to be investigated meticulously, otherwise there would be fish that slipped through the net.

But the area was so large, and if it was investigated too meticulously, he was afraid of delaying the battle. The news of the Huang Li drug trafficking gang being arrested probably hadn't spread too widely yet, but it would eventually spread. By then, the criminal suspects would run away directly, and the evidence brushed out would be easily wasted.

Because there were six floors in total, plus a basement, all of which were the focus of the investigation, the bridge boards of the Changyang City Bureau weren't enough, and a batch had to be purchased temporarily.

The bridge boards under Jiang Yuan's feet were the most suitable acrylic ones, which were a kind of plastic material often used for fish tanks, transparent and sturdy. A person weighing over 200 jin carrying some equipment, or carrying a body, wouldn't step on them and explode.

If it's light-transmitting, it's convenient for Jiang Yuan to do crime scene reconstruction, or blood analysis and other work.

Of course, the price of acrylic bridge boards is also the most expensive. The Changyang City Bureau used to buy some every year and saved some, but now it has become less for various reasons. Although a batch was purchased urgently, to control costs, only the sixth floor used transparent bridge boards, and the bridge boards downstairs were mostly metal, so they were covered.

Jiang Yuan walked on such bridge boards, constantly thinking about the investigation plan.

Huang Li's office was the top priority of this investigation, but it was over 200 square meters, with huge desks, sofas, chairs, wine cabinets, file cabinets, and safes. Calculated by surface area, the workload was explosive.

Not only that, this was also the office where the Huang Li drug trafficking gang fought to the end. They persisted in the room for a short period of time, burned some documents, flushed away some drugs, and finally tried to commit arson, but the result was extinguished, and only the curtains on one side of the wall were burned.

Therefore, describing this office as devastated is basically appropriate.

On the other hand, this office was also highly valued by the Changyang City Criminal Science Center.

The establishment of the Changyang City Criminal Science Center was equivalent to that of the Criminal Police Detachment, and more than half of the manpower was concentrated in this main building, and more than half of this half was working on the sixth floor.

So, the scene on the sixth floor had actually gone through a round of investigation.

Secondary investigation, and still finding decisive evidence, was an almost impossible task.

However...

Jiang Yuan thought about it, if there was any advantage to secondary investigation, it was that there was no mandatory task.

Primary investigation has standards. The fingerprints that should be extracted, the biological samples that should be extracted, and the photos that should be taken cannot be missing.

These are not only the basic resources for criminal policemen to solve cases later, but also important data for subsequent detection or error correction, and they will be used when public prosecution is made. Therefore, any crime scene investigator, trace evidence examiner, or forensic doctor has tasks and standards when doing primary investigation.

But secondary investigation doesn't have much to say. If you investigate new things, it's your ability; if you can't investigate, it's normal.

And for Jiang Yuan, he didn't need to take fingerprints, footprints, and bloodstains step by step.

Look first, if you feel it's unnecessary after looking, you can not collect fingerprints or footprints—this step will save a lot of time, which is also the time spent most by investigators.

As for how to judge whether it is necessary or not, the requirement is high.

Theoretically, different footprints and fingerprints have distinct signs, but it is too difficult for ordinary people to remember, and even after training, if they are not sensitive enough to relevant information, it may not work.

As far as Jiang Yuan's experience is concerned, the skill level above LV4 is relatively suitable.

Like footprint science, it recently rose to LV5, so there is still a little room for maneuver.

Of course, if it were used yesterday, the LV6 combat power would be more effective.

Anyway, after determining the plan, Jiang Yuan executed it without a word.

No matter how good the design and thinking are, it won't work without down-to-earth work. It's like in the configuration of the protagonist group in American dramas or Hollywood movies, there is always a technical geek who is silently dedicated and powerful, and occasionally Asian, and then the protagonist, although unlearned and skillless, is still vertical and horizontal, and everything is favorable...

The real world obviously doesn't have such weirdness.

In reality, criminal science technicians with decisive strength will instead become leaders. It's like the Eight Tigers of Criminal Investigation of the Ministry, basically experts in various fields. When they go out to solve cases, they basically command local criminal policemen to investigate and solve cases.

Jiang Yuan first looked at the fingerprints and footprints collected by others.

Through these fingerprints and footprints, the Anti-Drug Detachment had already captured more than a dozen fish that slipped through the net. They were basically backbone members of the Huang Li drug trafficking gang.

If they weren't backbone members, they couldn't enter this six-story small building.

Jiang Yuan sorted out the characteristic information of some fingerprints, remembered them carefully, and then wandered around in Huang Li's luxurious large office with an investigation lamp.

He took a multi-light source multi-color temperature investigation lamp with lithium battery, simply put, it was an investigation lamp that could shine multiple colors.

He also carried a large footprint lamp, which meant the same as a fingerprint lamp, but it was thicker and heavier than a fingerprint lamp or similar strong light flashlight. The advantage was that the light source was comprehensive, and the fingerprints and footprints that could be seen were more, and the effect was better.

Mu Mu Zhiyang, who was already a bit sleepy, ran over to help carry the footprint lamp.

Jiang Yuan then took a set of fingerprint powder and brushes. There are many schemes to make fingerprints show color, including but not limited to various fingerprint powders, 502, ninhydrin, etc. Theoretically, gold can also be used for molding, but it is not a determined important fingerprint, and Jiang Yuan doesn't need to toss.

Most of the fingerprints in the room are actually duplicates. The previous trace evidence examiners had taken them, and the fingerprints in the background library that could be matched could basically be matched.

Those that couldn't be matched, then the probability is that the library didn't store them, and it didn't make much sense for Jiang Yuan to pull them out.

Therefore, Jiang Yuan didn't look for them in conspicuous places. Places like office desks and safes must have been wiped again and again.

Of course, this is also because the attention paid to the large office is high, and the density of other trace evidence examiners is also high. You don't need to go down to the sixth floor. After leaving the large office, the meticulousness of the trace evidence examiners is very low.

Despite this, Jiang Yuan still checked the large office again today.

In addition to fingerprints, he also paid attention to footprints and other traces, including those of guns and bullets.

Until the sky was dark, Jiang Yuan finally uncovered more than half of a strange fingerprint next to a water dispenser.

He pointed out 13 characteristic points easily, ran it twice in the background, and ran out a 22-year-old young male.

Jiang Yuan marked it in the background while taking photos with his mobile phone and sent it to Deputy Detachment Leader Jin of the Anti-Drug Detachment.

It was likely a middle-level cadre of the Huang Li gang, perhaps a distributor, or a bodyguard.

Jiang Yuan didn't need to distinguish. The drug trafficking gang sealed this building tightly, which also had benefits. Every fingerprint found here was probably not innocent.

In other words, every fingerprint in this building had to be labeled with guilt first. Even the cleaners and cleaning aunties in the building couldn't know nothing about what happened in the building.

After doing this, Jiang Yuan turned around and said: "Go back to eat, stay in the police station tonight."

Mu Mu Zhiyang and Lu Lu Tongda were exhausted from carrying things and agreed repeatedly.

After instructing the remaining personnel to pay attention to safety, Jiang Yuan returned to a corner of the Criminal Police Detachment office, set up a folding bed for himself, and then curled up to look at the fingerprints and footprints in the background, so as to facilitate the investigation tomorrow.

Mu Mu Zhiyang gave Lu Lu Tongda a folding bed, set up his own bed next to Jiang Yuan, sighed, and said: "You say, the three of us combined, our net worth is at least a unit building, but we sleep on this kind of 99-yuan bed."

"Are these beds 99 for three? Is there a link?" Lu Lu Tongda's eyes lit up. He was a bachelor. If he put a folding bed in the unit, a folding bed in the car, and a folding bed in the living room, wouldn't his life be sublimated?

Mu Mu Zhiyang coughed twice: "Exaggerated a bit. Buy two get one free, it's about 170 or 180. Understand the spirit."

"That's not bad, what's the keyword?" Lu Lu Tongda spread himself out and started playing with the shopping website. After a while, he placed an order, and the demeanor of a local tyrant even covered Jiang Yuan.

Morning.

Jiang Yuan sat up smelling the strong sandalwood scent.

"This smell... is a bit familiar..." Jiang Yuan washed his face with mineral water, wiped it with a paper towel, and walked out of the office.

The door of the room opposite was open, and a little fragrance was lingering.

Jiang Yuan entered, and sure enough, he saw a basin of more familiar red eggs, red duck eggs, red goose eggs... and a green emu egg in the middle.

"Master." Jiang Yuan shouted.

Wu Jun turned his back to the door, waved his hand, and said: "Come over and help me look at this."

Jiang Yuan walked over quickly and saw a sweeping robot in front of Wu Jun, which was now exposed on the table.

"This is?"

"Bought second-hand online, I want to take it back and try it. Everyone says sweeping monk, sweeping monk. We who believe in the Three Pure Ones also have to do the homework of sweeping."

Jiang Yuan asked hesitantly: "Does using a sweeping robot to sweep the floor count as homework?"

"Of course it counts. Big monks use brooms to sweep the floor, use mops to mop the floor, aren't those all borrowing tools? Now it's a new era, tools have evolved into sweeping robots, using sweeping robots to sweep the floor, naturally it should also count as homework... and I'm not doing nothing, I've been repairing this thing all morning."

"Okay... by the way, can we believe in the Three Pure Ones?"

"Of course we have to believe, this is also advocated by the above," Wu Jun counted with his fingers: "Police situation cleared to zero daily, case filing cleared to zero monthly, accumulated cases cleared to zero quarterly—our Ningtai County is now a typical Three Pure Ones in Shannan Province."

What could Jiang Yuan say? He could only peel a red egg for breakfast.

"Not seriously injured, right?" Wu Jun poured him a cup of clear tea and asked.

"A little slight concussion, a few bruises on the legs, slight strain on the left arm, slight strain in a few places, nothing else, at most slight injury." Jiang Yuan explained in a bit more detail.

Wu Jun nodded when he heard it. If this was indeed the case, then the injury was indeed not heavy.

"It's good that you are obedient usually, and worship what you should worship." Wu Jun thought for a while, and pondered: "Okay, you do what you should do, I'll help you speak here."

"Speak... what?" Jiang Yuan was a bit hesitant.

"Then do you stay and listen?" Wu Jun asked back, and took out the posture of a master.

"No, no." Jiang Yuan shook his head hurriedly.

"Just say it, you do things in Changyang, even if you have strong ability, it's still very difficult. You do what you should do, I'll be here." Wu Jun took out a peach wood sword the length of a palm, placed it gently in front of the table, and closed his eyes slightly.

Jiang Yuan didn't dare to say more, took a few eggs, and retreated.

Returning to the office, he distributed the eggs to Mu Mu Zhiyang and Lu Lu Tongda, tidied up a little, and went straight to the crime scene in Shuidong.

Because Huang Li's office had already been checked last time, this time, Jiang Yuan chose the basement first.

Entering, he saw a few broken mechanical parts piled up at the door. The battle in the basement was still relatively intense. The equipment of the police plus armed police could smash most of the scene items in urban warfare.

Jiang Yuan subconsciously picked up a section of mechanical parts. This was a bent water pipe, one end was a broken end, and the other end was screwed with a small part.

Jiang Yuan couldn't help thinking whether there would be fingerprints or DNA left at the connection between the part and the water pipe.

He immediately unscrewed the threaded structure between the two.

Shining with a light source, a fingerprint actually appeared vaguely.

"A good start!"

Mu Mu Zhiyang, who had eaten a belly of red eggs, shouted immediately.

Jiang Yuan's eyes also shone. This fingerprint had a high probability of being left by the installation master. And in the basement of the building where the Huang Li gang was located, the only thing that needed to be installed by an installation master was the drug manufacturing machine. ===== CHAPTER 478 =====