Chapter 477: The Kryptonite

Jiang Yuan paced lightly on the bridge, thinking about how to do 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, investigating too meticulously, he was afraid of delaying the fighter plane. The news of the Huang Li drug trafficking gang being arrested shouldn't have 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 investigation, the bridge boards of the Changyang City Bureau weren't enough, and a batch had to be purchased temporarily.

The acrylic bridge boards under Jiang Yuan's feet were the most suitable, which is a kind of plastic material often used for fish tanks. It is transparent and sturdy. A person weighing over 200 jin carrying some equipment, or carrying a corpse, won't explode if stepped on.

If it is light-transmitting, it is convenient for Jiang Yuan to do crime scene reconstruction, or work like blood analysis.

Of course, the price of acrylic bridge boards is also the most expensive. The Changyang City Bureau bought a little every year in the past and saved some. Now, because of various reasons, it has become less. 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 covering them was covering them.

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 office 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 insisted for a very short time in the room, burned some documents, flushed away some drugs, and finally tried to commit arson, but were extinguished, only burning a wall of curtains.

Therefore, using "full of scars" to describe this office is basically appropriate.

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

The establishment of the Changyang City Criminal Science Center was equivalent to the Criminal Police Detachment. 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.

Therefore, 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 test materials that should be extracted, and the photos that should be taken, none can be missing.

These are not only the basic resources for the criminal police to solve the case later, but also important materials for subsequent detection or error correction, and they will be used when public prosecution is made. Therefore, any on-site investigation or trace examination or forensic expert has tasks and standards when doing primary investigation.

But secondary investigation has nothing to say. If new things are investigated, it's your ability. If not, it's realistic.

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, you can not collect fingerprints or footprints—this step will save a lot of time, which is also the time that investigators spend the most.

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

In theory, different footprints and fingerprints actually have distinct signs, but it is too difficult for ordinary people to remember. Even after training, if they are not sensitive enough to relevant information, it might not work.

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

Like footprint science, it recently rose to LV5, so there is still a bit of spare energy.

Of course, if it were used yesterday, LV6 combat power would be estimated to have better effects.

No matter what, 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 often Asian, and then you see the protagonist, although he is ignorant and incompetent, still crisscrossing the game, invincible...

The real world obviously doesn't have such weird things.

In reality, criminal science technical personnel 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 police 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. Basically, they were all 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 organized 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 held a multi-light source multi-color temperature investigation lamp, simply put, it is an investigation lamp that can shine many colors.

He also held a large version of the footprint lamp, which has the same meaning as the fingerprint lamp, but is thicker and heavier than the fingerprint lamp or similar strong light flashlights. The advantage is that the light source is comprehensive, and more fingerprints and footprints can be seen, and the effect is better.

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

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

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

Those that couldn't be matched, then the probability was that they weren't stored in the library. Jiang Yuan wouldn't have much meaning if he took them out.

Therefore, Jiang Yuan didn't look for them in obvious places. In places like office desktops and safes, the fingerprints must have been wiped once and again.

Of course, this is also because the large office is highly valued, and the density of other trace examiners is also high. There is no need to go down to the sixth floor. After leaving the large office, the meticulousness of the trace examiners is very low.

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

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

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

He clicked 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 is likely a middle-level cadre of the Huang Li gang, perhaps a distributor, or possibly their bodyguard.

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

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

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

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

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 Zhiyang gave Lu Tongda a folding bed, set up his 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 end up sleeping on these three 99-yuan beds."

"Are these beds 99 yuan for three? Is there a link?" 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 Zhiyang coughed twice: "Exaggerated a bit. Buy two get one free, it's about 170 or 180. Understand the spirit."

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

Morning.

Jiang Yuan sat up smelling the thick sandalwood scent.

"This smell... 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 on the Internet, 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: "Is using a sweeping robot to sweep the floor also considered doing homework?"

"Of course it counts. The big monk uses a broom to sweep the floor, uses a mop to mop the floor, aren't those all borrowing tools? It's a new era now. The tool has evolved into a sweeping robot. Using a sweeping robot to sweep the floor should naturally count as homework... and I'm not doing nothing. I've been repairing this thing all morning."

"Okay... speaking of which, 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 zero clearing, case filing monthly clearing, accumulated cases quarterly clearing—our Ningtai County is now a model of the Three Pure Ones in Shannan Province."

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

"The injury isn't heavy, right?" Wu Jun poured him a cup of clear tea and asked.

"A bit of a slight concussion, hit a few blocks on the legs, the left arm is slightly strained, there are a few places with slight strains, nothing else, at most a slight injury." Jiang Yuan explained in a bit more detail.

Wu Jun nodded as he listened. If that was indeed the case, the injury was indeed not heavy.

"Fortunately, you are obedient usually, and you worshiped what you should worship." Wu Jun thought for a while, and pondered: "Alright, you do what you should do, I'll help you speak here."

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

"Then are you staying to listen?" Wu Jun asked back, and took out the posture of a master.

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

"Just say it, you are doing things in Changyang. Even if you have strong ability, it is 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 withdrew.

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

Because he had already checked Huang Li's office 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, in urban warfare, could already smash most of the scene items.

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

Jiang Yuan couldn't help but think, would there be fingerprints or DNA left at the connection position 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 dimly.

"A good start!"

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

Jiang Yuan's eyes also shone. This fingerprint had a great 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 an installation master to install was the drug manufacturing machine.