The breeze blew gently.

The pine trees swayed lightly.

A Piao danced on the motorcycle.

The curator's heart rhythm went awry, his eyes turned white, and he leaned back lightly like a swallow.

"Curator, Curator..." His subordinate quickly held onto the curator's waist.

Meng Deyuan, who had been the curator of the funeral home for several years, smiled bitterly. "I knew this day would come. Did you all see it? There are many white things moving quickly."

"Curator, those are the forensic experts riding motorcycles," the subordinate said lightly, with good eyesight. Unlike Meng Deyuan, who had poor eyesight and heart disease, always thinking about strange things.

Meng Deyuan said, "You don't even put effort into making up lies now. I just saw several white things. And why would forensic experts ride motorcycles?"

The subordinate helplessly said, "Even ghosts don't need to ride motorcycles."

"Use honorific language."

"What?"

"Ah... at the speed of pre-reincarnation, let's call them that," Meng Deyuan had carefully studied this issue when he was admitted to the funeral home, and he didn't expect to encounter an opportunity to speak properly after several years. The subordinate looked at the forensic experts in front, playing more and more happily, sighed, and said, "You should change your glasses."

"What did you see again?" Meng Deyuan's eyes were damaged when he was young, and it wasn't a problem that could be solved by changing glasses.

"It's just... some pre-reincarnation souls playing with their phones," the subordinate said, "Wait a moment, it's definitely not appropriate to ride a motorcycle and play with a phone. If something happens, it could be a disaster."

He was too lazy to chat with the curator, so he went forward and called out several "riders."

Meng Deyuan saw the situation and went forward to look, and recognized the forensic expert Niu.

"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 in the funeral home, this was too strange.

Niu, the forensic expert, looked at Meng Deyuan inexplicably and said politely, "Meng Deyuan, we are doing an experiment today."

"What experiment?"

"About motorcycles," the forensic expert smiled and said, "There's a homicide case related to this."

"In the future, if there's a situation like this, you need to tell me in advance," Meng Deyuan looked at the large motorcycle and frowned. "How many motorcycles have you brought over? Our funeral home is a quiet place. Riding motorcycles one by one like this can easily disturb people and others."

"Okay, okay, we'll finish as soon as possible," the forensic expert just waved it off. If riding motorcycles disturbed the peace, it was easy to affect people's sleep in the residential area at 3 o'clock in the morning. Riding motorcycles in the funeral home yard early in the morning could even shake the urns, couldn't it?

"Alright, you go ahead." Meng Deyuan also knew that he couldn't stop Niu, but once he confirmed that there was no problem, his heart felt at ease. He patted his chest and said, "There's an open space behind the hall, you can go there to ride."

"Okay, we'll take a look." Niu, the forensic expert, happily rode the motorcycle back.

Compared to cooking 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 curator of the funeral home, he cared about everything in the funeral home, except for the pre-reincarnation souls.

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

Everyone rode their motorcycles according to their own ideas, studying the temperature of the exhaust pipes.

Different motorcycles had different exhaust pipe temperatures, and if there was some isolation in between, the situation would be even more complicated.

In this situation, it was basically impossible to conduct a complete and exquisite experiment.

Fortunately, forensic science never demanded this.

The goal of forensic science was to solve cases, so most of the time, forensic technicians only needed to discuss one or more possibilities.

In other words, it wasn't necessary to list all possibilities or guarantee their likelihood.

Practicality was the most important.

And the detectives would use their legs and sweat to check each of these possibilities.

More than thirty motorcycles were transported in the truck, including handsome racing motorcycles, handsome off-road motorcycles, and heavy motorcycles used by taxi drivers, and so on.

The motorcycles were mostly old second-hand goods, and it was unknown where Xu Taining had borrowed them from.

At first, everyone rode around randomly, and then used a snake skin bag made of the same material as the evidence to test the exhaust pipes.

In the end, the experiment had to be done with the actual evidence, but in the initial stage, it was enough to experiment with evidence of similar material. The same principle applied: forensic science didn't require such rigor. Regardless of the conclusion, it needed to be verified.A total of six forensic doctors, leaving the female forensic doctor Wang Lan to continue boiling the bones in the autopsy room. She doesn't ride a motorcycle, and doesn't want to, she just came out to get some fresh air and then went back in.

The other five forensic doctors were quite happy, each testing according to their own ideas.

Looking at several people trying to imitate the motorcycle handguards, it is clear that this type of motorcycle is unlikely to be bought by people in Zifeng Town, and even if they do, they can't ride up the mountain. Moreover, the back seat of this type of motorcycle designed for the racetrack is not suitable for carrying a body. The body of the motorcycle is too heavy, and if it falls, it is very likely that the person won't be able to lift the motorcycle. It's a lost cause.

After the forensic doctors finished their tests, the imitated racing motorcycles were all eliminated.

Everyone then tried other methods, including some who were hesitant, such as forensic doctor Niu, who once again rode the only escape vehicle on the scene, a large longitudinal-axis motorcycle similar to a Harley motorcycle - similar to the imitation race motorcycle. This thing weighs hundreds of kilograms once it leaves the paved road, and it's impossible to climb a mountain.

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

After a series of attempts, not only Jiang Yuan, but several others gradually began to have ideas.

"The type of vehicle doesn't matter much, it's mainly the speed of the vehicle," Jiang Yuan was serious about the testing from the beginning.

Playing with cars, he had enough experience when his family was demolished for the second time, and his interest in motorcycles had long surpassed the superficial knowledge of the type of vehicle.

In the simple test, Jiang Yuan found that the speed of the vehicle had the greatest impact on the temperature of the exhaust pipe, followed by time.

Jiang Yuan quickly concluded, "As long as the speed is fast, at a speed of fifty kilometers, the snake-shaped bag next to the exhaust pipe may be roasted. Even if the speed is a little lower, around 40 kilometers, if the time is longer, for example, 10 minutes, the temperature of the exhaust pipe will also be very high."

After testing several times, Jiang Yuan no longer needed to use a motorcycle bag for testing, he could directly measure the temperature.

If there is a difference in vehicle type, it mainly lies in the heat dissipation and insulation of the vehicle during driving.

In summary, it is the thermal effect of the motorcycle. 

While Wang Yuan had already reached a conclusion, Niu, the forensic doctor, had just finished playing around, so he repeated the tests a few times.

"So the bag won't break until the speed reaches about 30 kilometers?" Niu, the forensic doctor, was somewhat surprised.

"If climbing, the temperature of the special exhaust pipe may rise. The temperature of the exhaust pipe is ultimately determined by the working condition of the engine," the forensic doctor looked at the oldest person on the scene, but he was the most familiar with motorcycles. When he was young, he used to ride motorcycles for long distances on business trips, so he had experience, and now he had discovered the clues while riding.

"Climbing will increase the temperature, and the weight will also increase the temperature, right?" Niu, the forensic doctor, made a conjecture.

The forensic doctor nodded and said, "30 kilometers is indeed a bit slow, the motorcycle is not very suitable?"

"Is it difficult to maintain balance while carrying a body?" This was Jiang Yuan's guess.

Although it was just a guess, the overall idea was there, and everyone's emotions were uplifted.

So, Jiang Yuan proposed to experiment again.

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

Niu, the forensic doctor, cursed and lay down on the back seat of a street bike, looking extremely nervous.

Jiang Yuan also got on the motorcycle with a little nervousness, and started it up crookedly...

Meng Deyuan, the director of the funeral home, stood outside and watched this scene.

Back in the autopsy room, they took the evidence again and carefully studied the travel bag and the red and blue checkered bag, and the judgments of several people were once again confirmed.

"In that case, the murderer should have a motorcycle. Although it's not a breakthrough, it's still a direction," Huo, the forensic doctor, seemed a little more relaxed.

Compared to the other forensic doctors, his responsibility was a bit heavier.

Jiang Yuan also breathed a sigh of relief and repeatedly looked at the red and blue checkered bag, once again lost in thought.

Just knowing the speed of the motorcycle, or knowing that the murderer has a motorcycle, is still far from solving the case. It's rare to have such good evidence, and Jiang Yuan thought a little more deeply.

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

Direction and time.

There is only one road through Zifeng Town, and the murderer either lives in the town or has to pass through the town to get to the coal mine on the mountain.

Is he going south or north?

Jiang Yuan didn't want to think too much, so he directly turned over the damaged part of the travel bag, took out a cotton swab, moistened it, and carefully wiped it.

"I remember you took evidence from here." Forensic doctor Wang Lan immediately noticed Jiang Yuan's actions.Jiang Yuan wiped the evidence meticulously, unlike anyone else. Not only were his movements skilled, but the procedure was also complex, indicating a clear demand for precision and high self-confidence.

Jiang Yuan hummed in agreement and said, "I just thought of something. We can determine the direction the murderer came from and went to by comparing the trace evidence in the travel bag. Although we've done it before, it's worth double-checking."

Wang Lan didn't quite understand and asked, "How do you compare?"

"The outermost layer of the travel bag that contained the body not only experienced heat but also some wear and tear. If you look closely, there are holes. It was heated near the exhaust pipe, so the distance from the ground must have been very close. Therefore, the dust on the outside of the red and blue checked bag inside the travel bag likely comes from the road surface during travel," Jiang Yuan explained, now fully immersed in the state of on-site investigation. His explanation was not only clear but also his operation was extremely standard.

Just by watching his actions, the others were subconsciously convinced.

Forensic Zhai leaned in to take a look and asked earnestly, "How will you use this dust?"

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"Test its composition and compare the trace evidence," Jiang Yuan replied.

"After finding out the composition, then what? Who do you compare it with?"

"The soil composition of the roads to the south and north of Zifeng Town is definitely different," Jiang Yuan observed upon his arrival. He continued, "Most of Zifeng Town's coal is transported to the south. The coal mines have mostly ceased production, but there are still small coal kilns operating secretly, so the composition of coal in the south will be higher. To the north, there's a clay field still in operation, as well as a fertilizer factory and a pesticide plant. I don't know the exact composition of the soil on the ground, but I think if we take samples from both the south and north sides and compare them in the lab, we'll definitely find differences."

Forensic Zhai nodded slowly, understanding the logic clearly now.

Seeing this, Jiang Yuan added, "You'll need to expedite the trace evidence in the lab; we need to prioritize these samples. Otherwise, if we wait for the normal process, it will take a very long time."

Trace evidence had to be processed in the provincial lab, where the queue was long and the process slow, requiring someone's help to expedite the process.

Forensic Zhai caught on and immediately said, "Then let's go take samples from the roads to the south and north now, and I'll find someone to deliver them directly."

In such matters, Jiang Yuan didn't rely on others; he went to collect the samples himself.

Turning back, the group studied the wear on the outer travel bag again, but decided to give up and once more relied on Forensic Zhai to pull some strings.

The issue of wear on the plastic box was too complex and not something that could be tested in a short time. However, there were specialized labs for these tasks.

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