Zhou Ning's doubts did not stop the task release on the display screen, and green words kept popping up.

hint:

Please note that if you choose to view the task reward content, you will accept the task by default!

Temporary duty:

Find the vehicle and the perpetrator that hit and injured the deceased. The task must be completed within 48 hours. The reward for completing the task is level 3 of on-site forensic medicine. If the task fails, the initial reward will be reduced by one level.

Immediately, other words on the screen disappeared, leaving only a 48-hour countdown, and the sense of urgency suddenly emerged.

Zhou Ning:.

He wants to scold his mother. This is simply unreasonable. There are such rules, why didn't you tell him earlier?

Just a skid mark, what can this thing indicate?

Wait, skid marks.

Zhou Ning's Forensic Scene Study suddenly popped up in Zhou Ning's mind, and he automatically searched for a section about the investigation of the car accident scene. One of the very important sections was the skid marks.

Holding a ruler, Zhou Ning measured the width of the single-side brake mark more carefully this time, as well as the distance between the two brake marks, and estimated the wheelbase at the figure-8 mark.

Three values ​​were obtained: tire width 235 mm, wheelbase 1586 mm, and wheelbase 2841 mm.

Seeing these values, Zhou Ning looked up at Zhao Xinli.

"Do you know anything about cars? If you don't know, find someone who does."

Zhao Xinli stood on one side, watching Zhou Ning write and draw. Suddenly such a question made him a little confused, but he nodded quickly.

"You look down on people, don't you? I have studied everything from F1 to the three-wheelers used at home. I was able to dismantle the car my dad wanted to repair at the age of twelve. As long as there are cars on the market, they are available in China, and I basically understand them.

Son, if I say our criminal police team is second, no one dares to say it is first, so what do you want to do?"

Upon hearing this, Zhou Ning quickly handed the splint in his hand to Zhao Xinli.

"I don't know if you have studied these traces before. I measured it and got these three values. Can you tell what kind of car it is?"

"Let me take a look. People from the traffic police team came over and determined that it was a trace of a car, but we didn't let them get in."

Zhao Xinli glanced at it, became interested, blinked his little eyes, and quickly opened his mobile phone to search. Zhou Ning felt a little unsure. If he looked for Du Niang, it might not be accurate.

After a moment, Zhao Xinli raised his phone in front of Zhou Ning. There was a picture on it, full of various data, which seemed to be official content.

"The data that is most consistent with these data is the Volkswagen CC 2010 2.0TSI premium model. It is completely consistent with the data you gave."

Zhou Ning nodded vigorously, with uncontrollable excitement on his face.

"You can notify Xu Da. If you find the car model, the search range can be narrowed down."

Zhao Xinli smiled blindly and asked him to make the call to announce the good news. This was Zhou Ning's trust in him, so he quickly got up and made the call.

Zhou Ning stood up and walked more than ten meters north, and found that there was also a tower cone sign here, a slightly lighter brake mark, and although there was no figure 8 drawn at the end, it was still two opposite C shapes.

After measuring the data, it was found that it was completely different from the one just now, with a tire width of 357 mm, a wheelbase of 1590 mm, and a wheelbase of 2780 mm.

An idea suddenly appeared in Zhou Ning's mind. If there were two cars, could they be

He shook his head, maybe he was thinking too much.

Return to the bloody skid mark, kneel down on one knee, and use a small shovel to scoop up some rubber on the road surface.

When I was searching for the content of skid marks just now, there was an inspection report following it.

The report stated that the rubber in the brake marks on the ground was extracted and then compared with the wheel rubber of the suspect's vehicle to identify the suspect vehicle.

Thinking about it, the report appeared in Zhou Ning's mind again. This time he did not brush it all away, but looked at it carefully.

This article explores the conditions for gas chromatography-mass spectrometry analysis [1] of rubber cracking, and uses the established method and scanning electron microscopy-X-ray energy spectroscopy to examine the rubber evidence in a traffic accident case.

By comparing the test materials and samples, as well as the similarities and differences of rubber compounds and inorganic elements between different samples, the comparison and identification of the test materials and samples was achieved, and it was found that the tread rubber and sidewall rubber components of different tires were different, and even the components of the same tire were different.

There are also differences in the composition of tread rubber and sidewall rubber.

This has guiding value for the extraction of rubber physical evidence comparison samples, and provides an objective basis for the trial and litigation of cases.

The more he looked at it, the more Zhou Ning nodded, crossing over to the English part, under [Journal Name].

There is [year (volume) issue] 2016 (041) 005, Zhou Ning was stupid.

This is an article written six years later, so wouldn’t the forensic on-site learning I received become the teaching material a few years from now?

According to the system prompts, what I am getting now is Level 2 forensic on-site learning, and Level 3 is more detailed and avant-garde knowledge.

This discovery made Zhou Ning's heart beat faster with excitement.

His shoulders sank, and Zhao Xinli's big face came closer.

"Forensic Doctor Zhou, what are you thinking? Didn't you hear me talking to you?"

Zhou Ning exhaled, suppressed his excitement, packed the extracted rubber particles in an evidence bag, and stood up.

"What's wrong, I didn't pay attention to what you said."

"The boss said he will be here soon."

Zhou Ning said oh, thinking about the 48-hour deadline, she still felt a little worried.

At this moment, there was a sudden brake sound not far away, and a figure quickly got out of the car and crossed the cordon and ran to their side. The person who came was none other than Xu Dayuan, and the smile on his face could no longer be suppressed.

"Okay, forensic doctor Xiao Zhou, you've given me a lot of surprises today. Are you sure about the car model?"

Zhou Ning shook his head honestly.

"I'm not sure, but there is no problem with these three sets of data. Zhao Xinli is very familiar with cars. He found the Volkswagen CC 2010 2.0TSI promotional poster and compared it with what was found on site."

Xu Dayuan nodded and looked at the record in Zhou Ning's hand.

"Professionals are professionals. Our people found skid marks, but they didn't get much information. They just knew it was a car and it was speeding. I didn't expect to be able to compare these and give you a credit."

With that said, Xu Dayuan made a call and asked the person about the data. He was relieved when the other person gave him an accurate answer.

"It's confirmed, it's the new Volkswagen CC2010. Did forensic doctor Xiao Zhou find anything else?"

Zhou Ning thought for a while and walked to the edge of the blood stain.

"The deceased was standing here and was stabbed. He did not move after that and was then knocked away. Based on the distance the body flew 112 meters and the weight of the vehicle, even if the car braked 4.5 meters, the speed was more than 100 miles per hour. So the brakes

The previous speed would have been higher.

According to the rectal temperature calculation, the time of death of the deceased was 2:23 in the morning. In the report given, Forensic Doctor Liu asked me to write between 2:00-3:00. During this time period, driving at such a high speed, I found that there is another key point.

There are skid marks on a car running parallel to this one, so I guess someone is racing illegally?"

Zhao Xinli and Xu Dayuan both looked at Zhou Ning. After saying this, both of them were silent. Zhou Ning was a little nervous for a moment. Is his guess too outrageous?

At this moment, Xu Dayuan kicked Zhao Xinli with anger on his face.

"Biaozi thing, I went to check the identity of the deceased, and asked you to lead a team here to find traces of the scene, but you didn't even see it!"

Zhou Ning was stunned and did not dare to speak.

"Forensic Doctor Xiao Zhou, take me quickly to see the skid mark you found."

Zhou Ning led them over, glanced at Zhao Xinli apologetically, and found that this kid didn't know what embarrassment was, so he followed with interest, still smiling on his face.

"Leader, don't worry, I just saw that the marks here are somewhat similar, but compared with the brake marks where there are blood stains, they are much lighter here, and the braking distance is also longer."

Xu Dayuan waved his hand.

"Don't look for help for them. Check it quickly. What is this data? Can you know the model?"

Zhao Xinli was already eager to give it a try. He glanced at the three data and quickly browsed on his mobile phone. After browsing for a long time but nothing came up, Xu Dayuan had already raised his leg.

Zhao Xinli ducked to the side, his fingers seemed to be zooming in on the picture, and then he let out an exclamation.

"Let me go, is it true or not, there is someone in our county driving such an expensive car?"

PS:

【1】Fragmentation gas chromatography-mass spectrometry:

In traffic accident cases, the scratches and bumps of vehicle tires and other objects, as well as the sliding friction between brakes and the ground, will cause rubber particles to be transferred to the contact objects or left on the ground to form brake marks. Inspection of these rubber particles can provide

Restore the truth and identify the vehicle responsible for the accident to provide evidence.

Automobile tires mostly use natural rubber (NR), butadiene rubber (BR) and styrene-butadiene rubber (SBR) alone or in combination, with the addition of vulcanizing agents, accelerators, antioxidants, fillers and other organic or inorganic additives. It can be based on

The characteristic pyrolysis products can accurately determine the type of rubber. Combined with the SEM-EDX method, the organic components and inorganic elements in the rubber can be comprehensively analyzed. In recent years, it has become an important means of rubber inspection and identification.
Chapter completed!