Chapter 506

The Luojin City Criminal Police Detachment did not have its own vehicle inspection department. Similar to Changyang City, they also placed the car abandoned by the suspect in the Traffic Police Detachment's vehicle inspection center.

Everyone then took a car to the place. Jiang Yuan sat in the back seat, scanning all kinds of physical evidence involved in the case, such as fingerprints, footprints, DNA, etc., and also looked at the information provided by technical investigation and other aspects.

With LV5 fingerprint and footprint appraisal, he looked through these photos very quickly. Jiang Yuan didn't need to process them; he could flip past them after checking them slightly.

For Jiang Yuan, who is used to cold cases, the clues provided by this kidnapping case are a bit too many.

If given enough time and sufficient investigation resources, Jiang Yuan might be able to determine the criminal's information through several directions.

However, in the current situation, the criminal's identity is actually already known, which is not important. What is important is where they are hiding now and where they are going.

Showing the relationship between people and places is the scope of forensic botany, and it is also one of the reasons why Jiang Yuan chose this case.

Huang Qiangmin and the others probably have no clue at this time. There are too few people in the country who have mastered this technology, and ordinary people probably haven't considered it.

Traffic Police Detachment Vehicle Inspection Center.

In a very large indoor parking space, there was a JAC pickup truck waiting for inspection.

The car itself was a bit dilapidated, embodying the image of a poor family still working hard.

Looking at the battle-damaged interior of the car and the dirtiness of the truck bed, Jiang Yuan understood one of the reasons why it was not stolen but reported to the police.

"Fingerprints and DNA have already been taken, right?" Jiang Yuan asked, standing a few meters away from the car.

"About that, anyway, someone has already brushed it with a brush. Many photos have also been taken." In the administrator's understanding, a car that has had fingerprints and DNA taken is considered fully inspected.

Actually, that's not wrong. A normal, complete vehicle that has gone through this process is basically considered inspected.

Hearing this, Jiang Yuan's slightly worried mood disappeared.

He was most afraid that trace evidence had already been taken, so he could only look at the results organized by others. For him, a LV3 novice in forensic botany, it was still a bit troublesome.

However, if it was just taking fingerprints and DNA, normal people wouldn't wipe the whole car, but would use an investigation light or something to shine it, and then step forward to take evidence after seeing fingerprints or footprints.

For the collection of trace evidence or forensic botany, this level of pre-processing is nothing.

"Bring our tools over."

Jiang Yuan asked for a brush and began to brush the particles from all over the car.

From the chassis and tires to the floor mats, bumpers, air filters, radiators...

Huang Qiangmin, Mu Zhiyang, and others stood by, some not keeping up with Jiang Yuan's rhythm.

Huang Qiangmin asked Jiang Yuan while communicating with the leaders of the Luojin City Criminal Police Detachment: "Are we looking for trace evidence? Don't you usually do that at the very end?"

In his impression, Jiang Yuan usually only tries to find trace evidence when he cannot find other evidence.

Trace evidence is as its name suggests, small in quantity, and the amount of information it can provide is certainly not as much as normal evidence. In addition, trace evidence is also very expensive, so it is usually considered in the later stages.

But this time, what Jiang Yuan wanted to find was pollen and spores, so he said: "Luojin City should have already searched for all the evidence that could be found. I just want to find another way and try other plans. It should be okay, right?"

Jiang Yuan used a little emotional intelligence and asked Political Commissar Ge of the Luojin City Criminal Police Detachment with a smile.

He is usually too lazy to use this thing. He doesn't count on promotion and salary increase, and Huang Qiangmin is still protecting him in front. Using emotional intelligence day by day is a waste.

This time it's a little different. It's a different province, and it's not quite the same as being in Shannan Province. Cui Xiaohu also looks young. In this situation, he has to use a little emotional intelligence.

Of course, Huang Qiangmin has considered all of this, and emotional intelligence is also paid for, so it's not wasted.

Political Commissar Ge didn't know that every gift in fate is marked with a price, and some are especially expensive.

He even showed a slight smile because Jiang Yuan said he wanted to find another way.

If evidence was found by someone else in the things he had already searched, it would indeed be a bit embarrassing. Even if the evidence was found by Comrade Jiang Yuan, a famous expert invited by the ministry, the embarrassment would be the same.

However, if Jiang Yuan found another way to solve the case, it would feel much better. It's not that we didn't do well enough, it's that we took the wrong path, so we were just unlucky.

Political Commissar Ge laughed, "As expected of Expert Jiang Yuan, the initial strategy is different. Well, this is best. Everyone moves forward together and thinks of ways to solve the case..."

Huang Qiangmin smiled without saying a word. Jiang Yuan had never shown anything like moving forward together before.

Political Commissar Ge mentioned the case and continued: "The kidnappers this time are extremely arrogant. We suspect that they should have made long-term and sufficient preparations in advance, otherwise, they would not have been able to avoid this intensity of search. The three people even had the intention of deliberately making a big scene, kidnapping the child on the spot in front of other parents..."

"They wanted you to pay the ransom quickly?" Huang Qiangmin was very clear about the social impact of the case.

If it were a secret kidnapping case, the police would have plenty of time to pull with the kidnappers and would not easily choose to pay the ransom.

But if it is a kidnapping case with a relatively large impact, but not particularly large, in order to quickly eliminate the impact and solve the case, especially to save the hostages, superiors might instead pressure the police to pay the ransom quickly.

The balance here requires at least a LV1 kidnapping theory.

Political Commissar Ge knew exactly what Huang Qiangmin meant, nodded solemnly, and said, "It is indeed very possible. We speculate that they should have wanted to get the money and go abroad directly. At the beginning, they even wanted Bitcoin. We said it was illegal, and after much persuasion, it was not paid..."

"2 million in cash is also a big bag. Can they take it out?"

The three of them are already exposed, so it is naturally impossible to deposit the cash into a card. In fact, for the current banks, if you want to deposit an additional 500,000, you have to ask about the color of the dog seen when your great-grandfather was 18, not to mention that the serial number of the money must have been recorded.

Political Commissar Ge's face sank, and he added: "In this regard, we have several guesses. One, they can hide the money and find someone to dig it up later. Another, they are very likely to have a planned route, such as smuggling out from the sea."

The most famous thing in Baijiang Province is the Baijiang River. You can go out to sea by small boat from the Baijiang River, and then change to other fishing boats on the sea, etc. Going abroad is not as difficult as imagined. This process mainly requires money. A small boat with some speed costs hundreds of thousands, and the money for the fishing boat must be at least hundreds of thousands before anyone is willing to take risks with you.

And normal smugglers cannot come up with such a large sum of money.

"What about the victims? Can their life or death be determined?" Huang Qiangmin asked again.

"Yesterday was fine, today's call hasn't been made yet." Political Commissar Ge paused and said, "We verify the child's physical condition every time, but there is also danger."

Jiang Yuan did not participate in the conversation between the two and focused on studying the car.

The car body was covered with pollen and spores.

In the natural environment, pollen from wind-pollinated plants can drift hundreds of meters away. Think about the prosperous season of willow catkins and poplar catkins, it's just because willow trees and poplar trees are too blatant, which led to people's complaints.

In different time periods, pine, cypress, mulberry, wormwood, and vine are the main forces spreading pollen. It is very normal for pollen to drift hundreds of meters.

Most importantly, as a proof of location, the types and proportions of pollen and spores in each area are different.

Simply put, the pollen spectrum obtained by the murderer standing in front of a garden gate is completely different from standing a meter away.

Of course, to make a pollen spectrum of this degree, LV3 forensic botany is needed.

"Do you have a centrifuge?" Jiang Yuan wiped and washed, and classified the washed silt aside for subsequent use of the centrifuge.

"There is one in the trace evidence laboratory." Political Commissar Ge said.

"Then trouble them to process it." Jiang Yuan outsourced the primary task directly.

Luojin City is the provincial capital of Baijiang Province, with good economic conditions, and the newly built trace evidence laboratory also has three or four years of experience. Compared with ordinary physical and chemical laboratories, etc., the technical content of the trace evidence laboratory is much higher. Screening silt or something should not be a problem.

Jiang Yuan also asked for various strong acids, preparing to process samples taken from other places.

Strong acid is used to nitrify the background in the sample, such as sand, clay, fiber, lignin, humic acid, etc.

It sounds incredible, but in fact, when all these things are corroded by strong acid, spores and pollen will still be there.

Spore cysts, pollen grains, insects, fungal residues, and the shells of crustaceans all have a special polymer that can resist strong acids that even quartz, clay, and other substances cannot withstand. This polymer is called sporopollenin in plants and chitin in insects and fungi.

After this step, and even including this step, it is best to carry it out in the laboratory.

This is not only because using strong acid is dangerous, but also because a clean laboratory is needed in the end to protect against contamination.

There are also spores and pollen drifting in the air in the urban space.

In the next day, Jiang Yuan spent almost all his time in the laboratory and in front of the microscope.

The white-shirted officers of the Luojin City Criminal Police Detachment held expectations for Jiang Yuan, but also didn't quite understand.

Cui Xiaohu didn't understand either, but he still had to reassure the criminal police in Luojin City and explain to the leaders of the ministry who were paying attention to the case...

After a round, Cui Xiaohu felt more tired than the kidnappers.

Huang Qiangmin patted Cui Xiaohu's shoulder with understanding; it's not easy for anyone.