Chapter 645: One Step Closer

The aged corpses were soaked in sewage ponds or corpse water for about two years. Even if they were young people who drank milk to supplement calcium during their lifetime, they should not be able to stand it at this time. Using a horseshoe mirror to look, the pits and bumps on the surface of the bones are indispensable.

This is different from the bones of pigs, cattle, and sheep seen daily. Most of the pigs that walk from the vegetable market to thousands of households are between 8 and 12 months old. The months of the sheep are slightly older, and they have one more summer class. Most of the cattle are about three years old, so they are slightly stronger. But no matter which kind, they are much younger than the young humans in their twenties. The bone quality should naturally be much brighter and smoother.

Jiang Yuan and others also took the horseshoe mirror to find traces inch by inch only after confirming that there were really scratches.

At this time, Zhan Kan and a group of young forensic experts could only do second-line work, accompanying them all the way.

Soon, everyone found that Zeng Lianrong was always doing checks at about the same speed, while Jiang Yuan's speed was getting faster and faster.

Later, the speed at which Jiang Yuan's horseshoe mirror moved on the bones was three times that of Zeng Lianrong.

If this were his own apprentice, Zeng Lianrong would definitely scold him. If there were omissions in the middle of searching so fast, the whole work would be in vain, and he would have to go back and search again.

But Jiang Yuan's operation... Zeng Lianrong couldn't make suggestions. Although he felt that he was not serious enough, thinking about Jiang Yuan's record and ability, he had nothing to say. Anyway, Jiang Yuan just touched it with his hand, and it was at least equal to 8 Zhan Kans.

Jiang Yuan himself didn't feel it.

He is a LV6 tool trace identification, which is also the top-equipped skill he currently possesses. At this time, he also opened a temporary skill +1, nearly 7 hours of tool trace identification LV7, that is, the ox knife doesn't have a household registration book, otherwise, where it was produced would have to be pulled out.

In a short period of time, Jiang Yuan found six traces of sharp knife scratches, all very shallow, and corroded by the environment, which is very easy to be ignored.

According to Jiang Yuan's analysis, at least a LV4 or higher crime scene investigation, or forensic anthropology, or forensic pathology, etc., is needed to find and confirm these extremely small scratches. To identify them relatively easily, it is best to have a LV5 skill that meets the conditions.

Placed in Shannan Province, it would have to be a top big shot, sitting upright in front of the autopsy table, holding a horseshoe mirror and accompanying for a day and a night.

From this perspective, Zeng Lianrong's technical level is also very top, worthy of being one of the big shots in the autopsy center facing the whole city.

"The traces of the first one being dismembered are still very obvious, totaling eleven places. The second one also left knife marks at the joints, indicating that it was cut into large pieces." Jiang Yuan put down the horseshoe mirror and pondered: "Done very carefully, almost only the tip of the knife touched the bone. It should be an action of picking and breaking the fascia."

Jiang Yuan simulated it and felt that the murderer's movements were very neat.

"He is an old hand." Zeng Lianrong sighed and said: "He had better have practiced in a slaughterhouse."

As soon as the old forensic expert said this, several young forensic experts in the field couldn't stand it, and among them, there was a girl whose disgust symptoms clearly appeared on her expression.

Zeng Lianrong looked at the knife marks marked by Jiang Yuan carefully and found that they seemed to be more fragmented than what he found, so he felt relieved and added: "If I were young, I would want to find this kind of person. I would scan the list of meat processing enterprises in the city with information personnel, and then combine the list of people who have done private slaughter before, basically I could determine a scope. Now... this is not a matter of our city."

"Then notify Detachment Leader Tao first. Ox horn knife and bamboo basket are not very commonly used things. If you are lucky, maybe you can find them." Jiang Yuan said, but didn't hold much expectation.

This trick is relatively effective for ordinary murderers because ordinary people kill after countless plans, and then because of a certain opportunity, they finally decide to implement it. And those who finally realize it are often the batch who are most anxious. Those who can endure a little bit, maybe they give up later. Therefore, the murder tools of ordinary people are either ready-made household items or bought and used on the spot.

But the murderer in this case probably has handy weapons. Just look at the few corpses here, the first, second, and fifth have all been dismembered with the same ox knife. Obviously, the murderer doesn't have the habit of abandoning the murder weapon after committing a case.

Zeng Lianrong also made a phone call with a little expectation.

For serial killer cases, one cannot expect a thoroughfare to guide the police. Just like what was said before, becoming a serial killer is both a perversion and a result of social selection. No premeditated murderer wants to go to prison. If they are not arrested, these guys who benefit from killing will likely continue to commit crimes in the rest of their lives. If they still haven't been discovered or caught, they may become serial killers.

And no matter how they are formed, when they escape through multiple rounds of screening, they have already mastered many skills that should not be mastered, so that ordinary criminal investigation means are no longer effective for them. Only careful and detailed investigation, or technological progress, or luck, or the murderer making mistakes himself, has a chance to catch this guy.

Many serial killers abroad have not been arrested in the end. Famous ones like the Zodiac Killer, who crazily provoked the police, still escaped, which can be said to have really shocked society.

Jiang Yuan continued to look at the bones with a horseshoe mirror. This is a very tiring thing. Normal forensic experts will not do this under normal circumstances.

Most of the time, forensic experts work under a microscope, that is, they make pathological sections of the corpse, and then study them under a microscope. The content is a bit like the pathology department of a hospital. It's just that when forensic experts find that their research object has cancer, they only need to smile knowingly: not losing much.

The magnification of the horseshoe mirror cannot be compared with the microscope, but it is more convenient than the microscope. It belongs to the equipment used more by trace inspection. Jiang Yuan is used to on-site investigation and doesn't feel uncomfortable looking at it with a horseshoe mirror.

Zeng Lianrong made a phone call for a long time. When he came back, he saw Jiang Yuan looking at a bone in a daze.

Approaching, Zeng Lianrong coughed twice and said: "Just talked to Detachment Leader Tao for a while. The point of the ox knife still has a certain chance. Even if the murderer bought the knife very early, people who use this kind of knife are likely to buy related items, such as whetstones. Another point, professions like doctors or forensic experts, if they want to dissect a corpse, they are all used to using scalpels. Using an ox knife shows that the profession is likely related to the slaughter industry..."

Jiang Yuan looked up at this time and said: "Forensic Expert Zeng, wait a moment."

After speaking, Jiang Yuan took a piece of PVC electrostatic sticker from the tray on his side, covered it on the sternoclavicular joint he was just looking at, and wiped it as flat as possible.

Zeng Lianrong looked over along the trend and saw that there were tweezers, scissors, transparent tape, evidence bags, sulfuric acid paper, etc. on the tray, and collectors were placed next to it, immediately understanding that Jiang Yuan was extracting trace evidence.

Zeng Lianrong asked his apprentice Zhan Kan with his eyes.

Zhan Kan was stunned for a moment and hurriedly said: "Team Leader Jiang is talking about a white spot on the sternoclavicular joint, which doesn't look like bone chips."

"Then what is it?"

"More like white paint, let the laboratory take a look." Jiang Yuan turned the electrostatic sticker over, and a white micro-particle that was almost invisible to the naked eye was on it.

"Is it not something in the soil or sewage?" Zeng Lianrong picked up the magnifying glass, looked at it from a distance, and then asked and answered himself: "It really doesn't look like it, it's a bit like paint."

He said, and his eyes lit up.

Paint is a very special chemical product, and it is also a relatively comprehensive one among the various material libraries collected by the ministry. Most paints can basically be confirmed to the type through comparison. Compared with the ox knife, this is one step further. ===== CHAPTER 646 =====