civil forensic

Chapter 248 Thermal Effect

The breeze blows slowly.

The pine tree shakes gently.

Ah Piao, dance on the motorcycle.

The curator, arrhythmia, white eyes, leaning back as light as a swallow.

"Curator, curator..." The subordinate quickly grabbed the curator's waist.

Meng Deyuan, who has been the director of the funeral home for several years, smiled miserably: "I knew there would be such a day, did you see it just now? There are many white things moving fast."

"Curator, those are the forensic doctors riding motorcycles." The subordinate is very young, with good eyesight, unlike Meng Deyuan, who has old eyesight and heart disease, and always likes to think about strange things.

Meng Deyuan said: "You don't even have to worry about making up lies now. I saw several white ones just now. Besides, why does the forensic doctor ride a motorcycle?"

The subordinate said helplessly: "Ghosts don't need to ride a motorcycle."

"Use honorifics."

"what?"

"Well...the souls that have not entered reincarnation. Let's call them that for the time being." Meng Deyuan had carefully studied this issue when he was transferred to the funeral parlor. He did not expect to have the opportunity to talk about it after several years of work.

The subordinate looked at the forensic doctors who were playing more and more happily in front of him, sighed, and said, "Why don't you change your glasses."

"What did you see again?" Meng Deyuan's eyes were damaged when he was writing materials in his early years, and the problem cannot be solved by changing glasses.

"It's just... some souls who haven't entered reincarnation are playing with their mobile phones." The subordinate said: "Let me tell you later, it's definitely inappropriate to use mobile phones while riding a bicycle. If something happens, we'll just go straight to the dragon."

He was too lazy to talk to the curator, so he stepped forward and stopped several "riders".

Seeing this, Meng Deyuan went up to look, and recognized the forensic doctor Niu.

"Old Niu? Why are you...why are you riding a motorcycle?" Meng Deyuan felt that it was very unreasonable.

A group of forensics on a motorcycle, still in a funeral home, is just too weird.

Forensic Niu looked at Meng Deyuan because he didn't know, and said politely: "Curator Meng is here. Let's do an experiment today."

"What experiment?"

"About motorcycles." Forensic Niu smiled and said, "There is a murder case involving this."

"Well...you have to tell me in advance if this happens in the future." Meng Deyuan looked at the big cart again, frowned and said, "How many motorcycles have you brought over? Our funeral parlor is a quiet place, and you have such a motorcycle?" If you drive a motorcycle, it’s easy to make noise, and other things.”

"Okay, okay, let's finish it as soon as possible." Forensic Niu just perfunctory.As far as motorcycles disturb the people, driving a motorcycle in a residential area at 3 o'clock in the morning can easily affect everyone's sleep. If you ride a motorcycle in the yard of a funeral home early in the morning, can it shake the urn?
"Okay, you're busy." Meng Deyuan also knew that he couldn't control Niu forensic doctor.After confirming that it wasn't Ah Piao, his heart felt better, he waved his hand again, and said, "There is an open space behind that auditorium, you can drive there."

"Okay, let's take a look." Forensic Niu cheerfully rode back on his motorcycle.

Riding a motorcycle early in the morning is obviously more comfortable than cooking a corpse in the basement.

Meng Deyuan hesitated for a moment, then followed.

As the curator of the funeral home, he is very concerned about everything in the funeral home, except the souls who have not entered reincarnation.

The forensic doctors on motorcycles didn't care if anyone was watching.

Everyone rode a motorcycle according to their own ideas, studying the temperature of the exhaust pipe.

Different motorcycles have different exhaust pipe temperatures. If there is a little isolation in the middle, the situation will be more complicated.

In this case, it is basically impossible to do a complete and exquisite experiment.

Fortunately, criminal science has never been required to do so.

The goal of criminal science is to solve crimes, so most of the time, criminal technicians just want to discuss one or more possibilities.

That is to say, under what circumstances, the situation on the evidence may appear, just list a few situations.Neither need to list all, nor need 100% guaranteed possibility.

Practicality is the most important thing.

The criminal police will use their legs, feet and sweat to check these possibilities one by one.

A total of more than 30 motorcycles were transported in the cart, including handsome imitation racing motorcycles, handsome off-road motorcycles, and heavy motorcycles used by motorcycle drivers to solicit passengers.

Motorcycles are basically old second-hand goods, and I don't know which second-hand car dealer Xu Taining borrowed from.

Everyone first rode casually, and then tested the exhaust pipe with a snakeskin bag made of the same material as the evidence.

In the end, we still need to use evidence to do experiments, but in the early stage, it is enough to use evidence of similar materials for experiments.It's still the same reason, the requirements of criminal science are not so rigorous, no matter what conclusions are drawn, they still need to be verified later.

There were six forensic doctors in total, and the female forensic doctor Wang Lan was left to continue cooking bones in the dissection room. She didn't know how to ride a motorcycle, and she didn't want to, so she just came out to get some air and then went back.

The other five forensic doctors were quite happy, and each carried out the test according to their own thinking.

Look at a few people who choose the imitation motorcycle first, and you will know that this kind of motorcycle is not likely to be bought by people in Zifeng Town, and it is impossible to ride it on the mountain after buying it. Moreover, this kind of motorcycle is made according to the track motorcycle. , it's not easy to sit in the back seat, let alone carry a corpse.The car body is still too heavy. If you fall down and your legs are pressed, you may not be able to support the car yourself, so GG is over.

When Niu Forensic and others are done enjoying themselves, the imitation racing motorcycles will all be eliminated.

Everyone tried something else.There are also unreliable ones, such as Niu forensic doctor Ben Niu, who once again rode the only cruiser in the audience, which is a large vertical axis motorcycle similar to a Harley motorcycle-similar to the imitation race, as long as this thing leaves the paved road , that is, with a load of hundreds of kilograms, it is impossible to climb a mountain.

Others started to try the most likely street bikes and off-road bikes, and others ran to try the pedals.

After some experimentation, not only Jiang Yuan, but several people gradually came up with ideas.

"It has little to do with the model, but mainly the speed of the vehicle." Jiang Yuan has been doing the test seriously from the beginning.

He had had enough of playing with cars during the second demolition of his home, and his interest in motorcycles had already surpassed the superficial knowledge of car models.

In a simple test, Jiang Yuan found that the speed of the vehicle has the greatest impact on the temperature of the exhaust pipe.Second should be time.

Jiang Yuan quickly came to a conclusion: "As long as the speed is increased, the snakeskin bag next to the exhaust pipe may be roasted at 40 kilometers. Even if the speed is lower, such as about 10 kilometers, If you drive it for a longer time, such as [-] minutes, the temperature of the exhaust pipe will be very high.”

After several tests in this way, Jiang Yuan didn't need to take the packaging bag to try it, but just measured the temperature directly.

To say that there are differences in models, it is mainly the heat dissipation and heat insulation of the vehicle during driving.

To sum up, it is the thermal effect of the motorcycle.

Jiang Yuan came to the conclusion that Niu's forensic doctor had played enough, so he repeated the test several times.

"That is, the speed of about 30 kilometers is required, so that the packaging bag will not break?" Forensic Niu was a little surprised.

"If you climb a mountain, the temperature of the exhaust pipe may still rise. The temperature of the exhaust pipe is ultimately determined by the working conditions of the engine." Forensic Zhai looked at the oldest person, but he was the person most familiar with motorcycles at the scene.When he was young on business trips, he often rode a motorcycle for long distances. He had experience in the beginning, but now he was riding a bike, and he discovered the clues.

"Mountain climbing will increase the temperature, and carrying weight will also increase the temperature." Niu forensic doctor made inferences.

Zhai Forensic Doctor nodded, and said again: "30 kilometers, it is indeed a bit slow, the motorcycle is not good?"

"It's not easy to maintain balance while pulling a corpse?" This was Jiang Yuan's guess.

Guessing is guessing, but the general idea is there, and everyone's emotions are lifted.

Therefore, Jiang Yuan once again proposed to experiment.

Niu forensic doctor was selected first and got on the motorcycle.

The forensic doctor Niu lay on the back seat of a street car cursing, and he was so nervous that he died.

Jiang Yuan also got on the bike a little nervously, and started it crookedly...

Meng Deyuan, director of the funeral home, stood outside the venue, watching this scene,
They went back to the dissection room, took the evidence again, carefully studied the travel bag and the red and blue checkered bag, and the judgments of several people were confirmed again.

"In this case, the murderer should have a motorcycle. Although it is not a breakthrough, it is still a direction." Forensic doctor Zhai seemed more relaxed.

Compared with the other small forensic doctors, his responsibility is a little heavier.

Jiang Yuan also breathed a sigh of relief, then flipped through the red and blue grid bags repeatedly, and fell into deep thought again.

Just knowing the speed of the motorcycle, or knowing that the murderer owns the motorcycle, is still too far away from solving the case. It is rare to have such a good piece of evidence, so Jiang Yuan thought a little deeper.

Knowing the vehicle and speed, what else do you need to know to find the murderer?

direction and time.

There is only one road passing through Zifeng Town, and the murderer either lives in the town or passes through the town.Then go to the coal mine from Panshan Road on the side of the town.

So does he go south or north?

Jiang Yuan didn't think so much anymore, he turned over the damaged part of the travel bag, found the inside, took a cotton swab, moistened it, and wiped it carefully.

"I remember you took the physical evidence here." Forensic doctor Wang Lan immediately noticed Jiang Yuan's movements.

Jiang Yuan wiped the physical evidence, which was very different from others, not only because of his skillful movements, but mainly because of the cumbersome steps, with an obvious high demand and high self-confidence.

Jiang Yuan said "En", "It suddenly occurred to me that the traces of physical evidence in the travel bag can be used to compare the direction of the murderer's coming and going. Although I have wiped it before, I will guarantee it again."

Wang Lan didn't understand for a while, and asked, "How do you compare?"

"The outermost side of the travel bag containing the corpse is not only heated, but also wears to a certain extent. If you look carefully, there are holes. And it is heated at the exhaust pipe, so it must be very close to the ground. Therefore, the inside of the travel bag, The dust on the outside of the red and blue grid bags is likely to come from the driving road." Jiang Yuan has now entered the state of on-site investigation, and his words are not only clear, but also very standard in operation.

Just looking at his actions, several people were subconsciously convinced.

Fayi Zhai came over to look at it, and asked seriously, "How do you use this dust?"

"Measure the composition and compare the trace evidence." Jiang Yuan said.

"The ingredients have been measured, and then what? With whom to compare."

"The soil composition of the road to the south of Zifeng Town is definitely different from the road to the north." This is what Jiang Yuan observed when he came in, and said at this moment: "Most of the coal in Zifeng Town is sent to the south. Now the coal mines have basically stopped production, but there are still small coal mines secretly producing, so the coal in the south will have more components. In the north, the clay field is still producing, and there are chemical fertilizer and pesticide factories. I don’t know the specific composition on the ground. But I think that the north and the south will take samples separately and compare them in the laboratory, and we will definitely find the difference."

Fayi Zhai nodded slowly. This line of thinking is very clear when it makes sense.

Seeing this, Jiang Yuan said again: "You have to urge the laboratory of trace physical evidence to produce these physical evidence first. Otherwise, if you wait normally, you will have to wait for a long time."

Trace physical evidence has to be done in the laboratory of the provincial department. There are many sorts and the speed is slow. Someone needs to help to jump in the line.

Fayi Zhai understood, and immediately said: "Then let's take samples from the north and south roads now, and I'll find someone to send them there."

To do this kind of thing, Jiang Yuan did not rely on human hands, so he went to get it himself.

Looking back, several people studied the wear and tear of the outer travel bag again, gave up decisively, and once again let Forensic Zhai come forward to shake people.

The problem of wear and tear of plastic bags is too complicated, and it cannot be tested in a short period of time. However, there are always specialized laboratories to do these things. "

(End of this chapter)