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"Director Leng, what do you say?" Ye Qian asked.
Brother Ming explained: "Judging from the fact that the suspect put out the cigarette before finishing it, he should have a lot of cigarettes in his cigarette box, definitely more than four. People will be extremely nervous after committing a crime, especially after they have just finished. After the crime, this anxious psychological emotion was the most serious. In order to vent this emotion, he had to vent. Smoking was the most popular way for suspects. Under normal circumstances, the moment the vehicle was lit, if the suspect had something in his pocket, If there were cigarettes, then he would probably light them up immediately and smoke them one after another. It takes at least a few hours for a car to be ignited and burnt out. Xiaolong estimated that the suspect smoked for only a dozen hours. Half an hour is obviously too short. Even if there is a gap between the suspects, this is not consistent with common sense. The only explanation is that the suspect chose to leave the scene when he lit the car on fire; when the car burned out, he He turned back and squatted here again."
"If it's burned, it's burned. Why does he want to come back?" Ye Qian was a little confused.
"I suspect he went to get professional tools to polish the engine number." I put forward a hypothesis.
"It's entirely possible, but this view needs other evidence to support it." Ming Ge maintained a neutral attitude.
"Now that the source of the body and the car are unclear, where should we start?" Ye Qian said the current dilemma.
"It shouldn't be difficult to check the car." Lao Xian spoke slowly.
"It's not difficult? The car was burned like this, and there is no license plate, frame number, or engine number. How should I check it?" Fat Lei really couldn't think of any clever tricks that the old sage could come up with.
Lao Xian unhurriedly put the cigarette butts in the potholes into evidence bags. Then he adjusted his glasses, glanced at the burned car and said, "I just looked at the license plate and frame. The number plate was clearly visible, and it was probably removed before the car was set on fire."
"It doesn't matter what you say, we have discovered it a long time ago." Fat Lei choked.
"So I can only start with the engine number."
"How to get it? Is it possible that you can restore the worn engine number?" Fat Lei teased.
"Well, that's pretty much what it means." Lao Xian nodded seriously.
"I x!"
"x!"
"No way?"
Except for Brother Ming, we all screamed.
"What's all the fuss about?" Lao Xian neatly placed the cigarette butt evidence in the evidence box and replied disapprovingly.
"Brother Xian, are you telling the truth?" I confirmed again.
"Actually, this also overlaps with your subject field." Lao Xian explained to me, "The engine number of a car is actually formed by the contact between the coding tool and the marked body under the action of mechanical external force. The marked body includes steel alloy , aluminum alloy, zinc alloy, etc., after contact, they will form concave three-dimensional traces, and the alphanumeric sequence formed by these concave three-dimensional traces is the unique identification code of the engine."
"My x, Brother Xian, you explained it so professionally!" I gave him a thumbs up.
Facing my compliments, Lao Xian's expression did not change at all. He continued: "During the coding process of the engine, its metal crystal structure was changed due to damage. The suspect's polishing of the engine number only changed the original number. The visible number is destroyed so that it cannot be recognized by the naked eye. However, during the coding process of the metal crystal under the mark body, the density of the inner layer of the crystal changes. This change is invisible to the naked eye. I can use Chemical reagents intervene. Due to the different densities of metal crystals, the reaction speed is also different; the metal crystal structure is different in density, and its reflection and absorption of light are also different; in addition, the corrosion resistance of the damaged layer and the undamaged layer of the engine Changes have also taken place, and I can completely remove the worn engine numbers with just a little tweaking."
"You are awesome!" I said with admiration.
"Leave it to Guoxian to handle the engine number. We have one more thing to deal with next."
"whats the matter?"
"Examination of the corpse. The deceased had a sharp heart injury. We did not find any blood at the scene. This should only be the scene of moving the body. The first scene of the murder is not here."
We all agreed.
Brother Ming continued: "Did you notice the posture of the deceased when his body was burned?"
At Brother Ming¡¯s prompt, Pang Lei opened the camera and enlarged the original photo: ¡°Are your feet facing the south?¡±
"Yes, the car is parked east and west, with the front of the car facingEast, the rear of the car is facing west. If the deceased was killed in the cab, then his toes should be facing the east. But if you look at this scene, the toes of the deceased's feet are all pointing south, which is the position of the co-pilot. "
"Brother Ming, you are saying that the body was originally in the passenger compartment, and this situation was caused when the suspect moved the body from the passenger compartment before burning the body?" I have fully understood the essence of Brother Ming's speech.
"Xiaolong is right. This can also prove that the deceased was killed before he came here. However, just to be on the safe side, Guoxian will take some of the deceased's heart blood for testing to see if there is any carboxyhemoglobin component."
"Okay, Brother Ming."
"You can put this aside for a while, and seize the time to find out the engine number first. The most important thing is to find out the source of the car."
"OK!"
"Ye Qian!"
"Director Leng, please tell me."
¡°Notify the Criminal Police Team to keep an eye on the reports of missing persons in recent days and provide timely feedback as soon as there is any situation!¡±
"Understood." (Remember the website address: www.hlnovel.com