Chapter 238: Thermal Effect

A gentle breeze blew.

The pine trees swayed gently.

Ghosts danced on the motorcycles.

The director's heart rhythm was abnormal, his eyes turned white, and his body leaned backward as light as a swallow.

"Director, Director??" The subordinate hurriedly held the director's waist.

Meng Deyuan, who had been the director of the funeral home for several years, smiled miserably? I knew there would be such a day, didn't you see it? There are many white things moving fast.

"Director, that's the forensic experts riding motorcycles." The subordinate was half-light, and his eyes were good, unlike Meng Deyuan, who was old and dim-sighted and had heart disease, always liking to think of strange things.

Meng Deyuan said: "You don't even use your heart to lie now, I just saw several white ones. And why do forensic experts have to ride motorcycles."

The subordinate was helpless: "Ghosts don't need to ride motorcycles either."

"Use honorifics."

"What?"

"En... speed of not entering reincarnation, let's call them that for now," Meng Deyuan had carefully studied this problem when he was first introduced to the funeral home, but he didn't expect that after doing it for several years, he would finally have the opportunity to speak properly. The subordinate looked at the forensic experts who were playing more and more happily in front, sighed, and said: "Why don't you change your glasses."

"What else do you see?" Meng Deyuan's eyes were ruined when he was writing materials in his early years, and it wasn't a problem that could be solved by changing a pair of glasses.

"It's just... some souls not entering reincarnation are playing with mobile phones," the subordinate said: "Wait a moment, I'll say something, riding a motorcycle and playing with a mobile phone is definitely not appropriate, if something happens, it's a direct one-stop service."

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

Seeing this, Meng Deyuan stepped forward to look and recognized forensic expert Niu again.

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

A group of forensic experts riding motorcycles, and still in the funeral home, this was too strange.

Forensic expert Niu looked at Meng Deyuan without understanding and said politely: "Director Meng is here, we are doing an experiment today."

"What experiment?"

"About motorcycles." Forensic expert Niu smiled and said: "There is a homicide case involving this."

"..." In the future, if there is such a situation, you must say it in advance. Meng Deyuan looked at the large flatbed cart again, frowned, and said: "How many motorcycles did you get? Our funeral home is a quiet place, you drive motorcycles one by one like this, it's easy to disturb people, and others."

"Okay, okay, we'll finish as soon as possible." Forensic expert Niu was just saying it. To say motorcycles disturb people, riding motorcycles in a residential area at 3 a. m. is indeed easy to affect everyone's sleep, but riding motorcycles in the funeral home's yard early in the morning, can it vibrate the bone ash box?

"Fine, you go ahead." Meng Deyuan also knew he couldn't stop forensic expert Niu. Confirming it wasn't a problem, his heart felt comfortable, and he gestured, saying: "There is an open space behind the auditorium, you can go there to drive."

"Okay, let's go see." Forensic expert Niu rode the motorcycle back happily.

Compared to boiling corpses in the basement, riding a motorcycle early in the morning was obviously more comfortable.

Meng Deyuan hesitated for a moment and followed.

As the director of the funeral home, he cared about everything in the funeral home, except for the souls not entering reincarnation.

The forensic experts riding motorcycles didn't care if anyone was watching.

Everyone followed their own ideas, rode motorcycles, and studied the temperature of the exhaust pipe.

*p&%q*e+t Different motorcycles had different exhaust pipe temperatures, and if there was a bit of isolation in the middle, this situation was even more complex.

In this situation, doing a complete and exquisite experiment was basically impossible.

Fortunately, criminal science never required this.

The goal of criminal science was to solve cases, so most of the time, criminal technology technicians just had to discuss one or more possibilities.

That is to say, under what circumstances could the situation on the evidence appear, and list a few situations. Neither listing all nor guaranteeing the possibility was needed.

Practicality was the most important.

And criminal police would use their legs and sweat to check these possibilities one by one.

There were over thirty motorcycles on the flatbed cart, including very handsome racing motorcycles, very handsome off-road motorcycles, and heavy motorcycles used by motorcycle taxi drivers to pick up passengers, etc.

The motorcycles were basically old second-hand goods, and it was unknown which second-hand car dealer Xu Taining borrowed them from.

Everyone first rode them randomly, and then used snake-skin bags of the same material as the evidence to test the exhaust pipe.

Ultimately, they had to use the evidence to do the experiment, but in the initial stage, using evidence of similar material to experiment was fine. It was still that principle; criminal science didn't require such rigor. Regardless of what conclusion was obtained, it still needed to be verified later.

A total of six forensic experts left female forensic expert Wang Lan in the autopsy room to continue boiling bones; she couldn't ride a motorcycle and didn't want to ride, so she just came out to get some air and then went back.

The other five forensic experts were quite happy, each following their own train of thought, calling it doing tests.

Looking at several people riding racing motorcycles, one knew that this kind of car, let alone people in Zifeng Town, was unlikely to buy, and even if they bought it, they couldn't ride it up the mountain. Moreover, this kind of racing motorcycle was not easy for the back seat to sit on, let alone carry a corpse. The car body was also too heavy; if it fell, it would press on the leg, and it was likely they couldn't lift the car themselves. Just gg.

After forensic expert Niu and others finished playing, the racing motorcycles were all eliminated.

Everyone then tried others one after another, and there were those who didn't dare to ask, such as forensic expert Niu himself, who rode the only cruiser in the field again, which was a large longitudinal axis motorcycle similar to a Harley-Davidson style--it was similar to a racing motorcycle. As long as this thing left the paved road, it was a burden of hundreds of kilograms, and climbing the mountain was impossible.

Others began to try the most likely street bikes and off-road vehicles, and some ran to try scooters.

After a try, not only Jiang Yuan, but several people gradually had ideas.

"It doesn't have much to do with the car model, it's mainly the speed." Jiang Yuan had been doing tests seriously from the beginning.

Playing with cars, he had played enough when his home was demolished for the second time, and his interest in motorcycles had long passed the shallow cognition of car models.

And in the simple test, Jiang Yuan discovered that speed had the greatest impact on the exhaust pipe temperature, followed by time.

Jiang Yuan quickly concluded: "As long as the speed is fast, under the condition of fifty kilometers, the snake-skin bag touching the exhaust pipe has the possibility of being roasted through. Even if the speed is a bit lower, for example, around 40 kilometers, if it is driven for a long time, for example, 10 minutes, the exhaust pipe temperature is also very high."

Testing a few times like this, Jiang Yuan didn't need to use the motorcycle packaging bag to test, just measure the temperature directly.

To say there was a difference in car models, it was mainly the heat dissipation and heat insulation of the vehicle while driving.

To summarize, it was the thermal effect of the motorcycle.

Jiang Yuan had concluded, and forensic expert Niu's side had played enough, so he also repeated the test a few times.

"That means at a speed of about 30 kilometers, the packaging bag won't break?" Forensic expert Niu was a bit surprised.

"Climbing the mountain, the exhaust pipe temperature might rise. The exhaust pipe temperature is ultimately determined by the engine's operating condition." Forensic expert Zhai, who looked the oldest, was the person most familiar with motorcycles on the scene. When he was young, he often rode motorcycles for long distances on business trips, and originally had experience. After riding for a while, he discovered the clue.

"Climbing the mountain will increase the temperature, and carrying a load will also increase the temperature, right?" Forensic expert Niu drew inferences.

Forensic expert Zhai nodded and added: "30 kilometers is indeed a bit slow, the motorcycle is not very good?"

"Pulling a corpse, it's not easy to maintain balance?" This was Jiang Yuan's guess.

Guessing was guessing, but the general train of thought was there, and everyone's mood was excited.

So, Jiang Yuan proposed to experiment again.

Forensic expert Niu was selected first and rode the motorcycle.

Forensic expert Niu cursed and lay on the back seat of a street bike, his whole body nervous to death.

Jiang Yuan was also slightly nervous as he rode the car and started it crookedly??

The funeral home director Meng Deyuan stood outside the field, watching this scene.

Returning to the autopsy room, he took the evidence again and studied the travel bag and the red and blue plaid bag carefully, and the judgments of several people were verified again.

"In this case, the killer should own a motorcycle. Although it's not a breakthrough, it can be considered a direction." Forensic expert Huo was more relaxed.

Compared to other small forensic experts, his responsibility was heavier.

Jiang Yuan also relaxed slightly, flipped through the damaged part of the travel bag again, and fell into deep thought again.

Just knowing the motorcycle speed, or knowing the killer owned a motorcycle, was still too far from solving the case. It was rare to have such a good piece of evidence, so Jiang Yuan thought more deeply.

Knowing the vehicle and speed, what else did one need to know to find the killer?

Direction and time.

Zifeng Town only had one road passing through the town. The killer either lived in the town or had to pass through the town, and then go up to the coal mine from the mountain road on this side of the town.

Then did he go south or north?

Jiang Yuan didn't want to think that much anymore, directly flipped over the damaged part of the travel bag, took out a cotton swab from the inside, moistened it, and wiped it carefully.

"I remember you took evidence from here." Forensic expert Wang Lan immediately noticed Jiang Yuan's action.

Jiang Yuan wiping evidence was very different from others; not only were his movements skilled, but the steps were cumbersome, and there was a clear high demand and high confidence.

Jiang Yuan said "En" and said: "I suddenly thought that I could compare the killer's direction through the micro-evidence in the travel bag. Although I did it before, let's do it again."

Wang Lan didn't understand for a while and asked: "How to compare?"

"The outermost side of the travel bag containing the corpse not only suffered heat but also had a certain amount of wear. Look carefully, there are pinholes. And it suffered heat at the exhaust pipe, so the distance from the ground must be very close. Therefore, these gray soils inside the travel bag and outside the red and blue plaid bag are very likely to come from the road surface." Jiang Yuan had now entered the state of scene investigation, and what he said was not only clear but the operation was extremely standard.

Just looking at his movements, several people subconsciously believed him.

Forensic expert Zhai leaned over to look and asked seriously: "How do you use these gray soils?"

"Measure the composition and compare the micro-evidence." Jiang Yuan said.

"After measuring the composition, then what? Compare with whom?"

"The composition of the soil on the south road of Zifeng Town and the north road must be different." This was what Jiang Yuan observed when he came in, and at this moment he said: "Most of the coal in Zifeng Town is sent to the south. Now the coal mine has basically stopped production, but there are still small coal kilns secretly producing, so the composition of coal in the south will be more. In the north, the pottery clay field is still in production, and there are fertilizer plants and pesticide plants. I don't know the specific composition on the ground, but I feel that taking samples from both the north and south sides and comparing them in the laboratory will definitely find differences."

Forensic expert Zhai nodded slowly; this train of thought was very clear once explained.

Seeing this, Jiang Yuan added: "You have to urge the micro-evidence laboratory to get these pieces of evidence done first. Otherwise, if you wait normally, you will have to wait a long time."

Micro-evidence had to be done in the provincial department's laboratory, which had many queues and slow speed, so someone had to help to jump the queue.

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

Doing this kind of thing, Jiang Yuan didn't let others do it either, and went to take them himself.

Turning back, several people studied the wear of the outer travel bag again and decisively gave up, again asking forensic expert Zhai to shake people.

The wear problem of the plastic box was too complex, and it wasn't something that could be experimented with in a short time, but there were always specialized laboratories doing these things. ===== CHAPTER 239 =====