Chapter 601: Evidence Collection Stage

"Since it's a current case, let's do it first." Jiang Yuan didn't pick and choose. Theoretically speaking, the difficulty coefficient of the current case itself was high enough, and as for whether this case was difficult or not, he would have to investigate it deeply to have a say.

Since he had to investigate deeply, he might as well solve the case—this was Jiang Yuan's very direct thought. He didn't want to spend too much energy outside the case, as long as there were no pits in this case.

Huang Qiangmin followed this trip, and Bureau Chai was transferred away, so Jiang Yuan felt that there shouldn't be much problem in this regard.

Wang Chuanxing and the others stepped forward, separated the case files, spread them out on the long conference table, and everyone read them separately.

Jiang Yuan also sat down, took the autopsy report again, took the photos, and in turn...

The forensic level of this case was quite good. Suspecting carbon monoxide poisoning, they immediately extracted heart blood.

According to the concentration of carbon monoxide hemoglobin in the heart blood, it could not only determine that the deceased was carbon monoxide poisoned, but also judge that the onset method was not chronic poisoning, but acute poisoning—if it was a 50% concentration, it might be the former.

This also matched the situation at the scene.

The victim didn't even pull the car door, and there were no self-rescue measures. This shows that the deceased lost consciousness or the ability to control limbs within a short time.

This shows from another side that the victim's person was not controlled.

At the same time, the deceased's expression was natural, the clothing was complete, and the autopsy found no mechanical violent injuries—this shows from another side that the victim was not in a state of personal control at that time.

Then the question arises: why would the victim be poisoned by high-concentration carbon monoxide in a sealed car without being controlled?

Jiang Yuan, as a forensic doctor, first thought of using drugs to control.

The previous forensic doctor did do some toxicology tests, but they were all common drugs. Outside of common drugs, there are plenty of drugs that can cause fainting.

Jiang Yuan wrote the two words "drugs" in his notebook.

Secondly, could it be a crime committed by an acquaintance?

However, the victim died of acute poisoning. If the victim and the murderer were in the same room, unless they were wearing gas masks or something, they would definitely be finished, not to mention...

That said, Jiang Yuan still wrote down the four words "crime by acquaintance."

The reason he wrote it down was because he suddenly thought that many people now wear masks daily. At least wearing a mask is not abrupt. If the murderer wears a mask with activated carbon, or a more special mask with adsorption, it is possible to hold on for a while.

Finally, could it be that the person was killed outside and then moved into the car?

Jiang Yuan flipped out the photos of the car after the victim was moved. On the driver's seat, there was excrement everywhere. Not discussing the issue of elegance, these filth were left by the victim before death. In other words, at least her final moments were indeed in this driver's seat.

Even if the murderer could move the body over, there was no way to move the excrement over.

As for moving it at the last moment, it was the conclusion brought by the content of carbon monoxide hemoglobin in the heart blood. The victim died of acute poisoning, and there wasn't that much time for the murderer to "card bug."

In summary...

Jiang Yuan put down the paper and pen and said: "I'm going to survey the car next. For others, I think we should check two directions first. One is drugs. I want to do it more carefully. Can I trouble Team Leader Zhou to contact the laboratory?"

"No problem." Old Zhou was an old criminal police officer. He knew what Jiang Yuan was thinking after turning his brain. Although he didn't quite approve of this idea—after all, if you have unconventional drugs, just poison the victim directly; why bother with carbon monoxide? It's purely "taking off your pants to fart," right?

Therefore, Old Zhou had considered this idea, but didn't bother the laboratory directly.

However, now that the 72-hour golden period had passed—to be precise, the brass period had passed—it was normal for Jiang Yuan to expand his investigation ideas.

"The victim's relationship network should have been checked, right? No results?" Jiang Yuan asked Old Zhou again at this time.

Old Zhou shook his head and said: "No results yet. The victim's husband and wife relationship is stable, and there is a child who is already in junior high school. The family is considered well-off, with hundreds of thousands of yuan in savings, a three-bedroom and two-living room house in Beijing, and two cars. Both parents are healthy, and life is... better than mine, at least."

"Anything else?"

"The victim is a state-owned enterprise employee. The relationship with colleagues is neither good nor bad. She is just an ordinary office clerk, and there are no overly sharp contradictions with surrounding colleagues. In terms of relatives and friends, we are also verifying them one by one, and they generally express shock. She also lent money to two relatives, one 50,000 and one 30,000. Then there are classmates and some clients, which may need to be checked carefully."

Jiang Yuan first expressed approval, saying: "It's already very impressive to find so much in three days."

Old Zhou smiled and said: "Then we continue to check along the relationship network?"

"Good. Sorry for the trouble." For the people Jiang Yuan brought, even if they were sent out to investigate, it would be better to have local police follow them to do things, otherwise they wouldn't be familiar with all aspects. On the contrary, for clear arrests and the like, sending people directly wouldn't have much impact.

"There is no surveillance where the car is parked. How about the surroundings? Any conclusions?"

"No. We specifically checked several important related people, including the victim's husband, son, and debtors, etc., none of whom appeared in the surveillance that day. I also asked the car owners of several cars around, and there was nothing useful."

"Alright. Let's do that for now."

For Jiang Yuan, the case was just beginning. No matter how many assumptions there were, he had to investigate before he could continue.

Jiang Yuan arranged and exhorted a few more items, then said directly to Wang Chuanxing: "Chuanxing, you will be responsible for the remaining personnel allocation later. I'm going to look at the car."

"Yes." Wang Chuanxing responded happily. He was actually from the Changyang City Criminal Police Detachment. Now that he had returned, although he wasn't a king, his emotions were also very excited.

Jiang Yuan took Mu Zhiyang to the Criminal Science Center to see the car.

Wan Baoming of the Criminal Science Center could be said to be an old acquaintance. Knowing Jiang Yuan was coming, he had even washed the bathroom clean—the cleaning method of the body ensured the cleanliness of the bathroom!

Jiang Yuan didn't need to be polite either. Dressed neatly, he went to see the car.

Car inspection room.

As soon as he entered the door, he could smell a rich smell.

Jiang Yuan couldn't help but look at the two technicians in charge here. The two had meaningful smiles on their faces.

"The body was moved away, but the excrement wasn't." Wan Baoming used the simplest words to express the most practical impact at the moment.

Even as a forensic doctor, Jiang Yuan couldn't help but frown.

"It will be fine when it dries." A technician kindly advised.

"Don't want to come a second time." Jiang Yuan sighed heavily, stepped forward, and opened the car door.

The rich smell of excrement rushed toward him. It smelled stinky, and eating... it was poisonous.

"Fingerprints and DNA have been collected... find a whiteboard." Jiang Yuan had psychological expectations and endured it.

A technician ran fast, brought a whiteboard, and placed it in front of Jiang Yuan.

Jiang Yuan hung a series of fingerprint photos extracted by the trace inspection onto the whiteboard, and then, holding a survey light, leaned into the Mercedes-Benz A involved in the case.

Pure trace inspection can only be surveyed by area during the survey stage; it's not about teamwork or anything.

And Jiang Yuan's crime scene survey skills have now reached the LV5 level. Not using them is a waste.

As for what the result will be, Jiang Yuan himself doesn't know.

In any case, this case feels better to Jiang Yuan than previous cold cases.

The pressure of the current case won't be small, but that's aimed at the big shots. Jiang Yuan himself just needs to solve the case.

Jiang Yuan is looking forward to being able to do a simple crime scene reconstruction through some... liquids, solids, and other traces.

If he can infer what happened at the crime scene, perhaps he can understand the source of the carbon monoxide that killed the victim. ===== CHAPTER 602 =====