Chapter 22: Su Ming Brings New Criminal Investigation Techniques, Shocking Xu Changsheng!!!

The murderer is a left-handed person!

Su Ming’s conclusion left Xu Changsheng stunned for a moment.

Then, he quickly leaned forward to look at the screen, his face full of shock and confusion.

“No, Xiao Ming,” he said. “How did you determine that the murderer is left-handed?”

“As for the cooked body’s muscle texture and the cuts, aren’t they somewhat random? How can they be used as clues for deduction?”

Clearly, Su Ming had deduced the murderer’s dominant hand from the cuts and muscle texture on the victim’s body.

This, in fact, exceeded Xu Changsheng’s understanding.

Because, in criminal investigation, it’s a known technique to analyze the victim’s wounds to deduce the weapon and direction of the attack. However, there’s a prominent premise in the Mo Du University dismemberment case.

That is, the victim’s body was pre-cooked before being dismembered into small pieces.

Xu Changsheng had never encountered a situation where one could determine the murderer’s dominant hand from the muscle texture and cuts!

…

Looking at Xu Changsheng’s astonished expression, Su Ming was not surprised at all; he had anticipated this reaction.

This technique of using cooked body muscle texture and patterns to find clues had long surpassed the capabilities of normal criminal investigators.

In real-world criminal investigations, determining the murderer’s dominant hand is extremely difficult, and one might even say impossible.

When committing a murder, the killer usually acts naturally, using whatever hand feels most comfortable to achieve their goal.

Even if the murderer is left-handed, it’s quite possible that, in a moment of adrenaline, they could pick up the weapon with their right hand, especially if it was closer.

Due to the many uncertainties, determining the dominant hand is a challenging task. It’s not as simple as in TV shows where you can just glance at the wound and immediately know the dominant hand. That’s simply impossible.

If Su Ming hadn’t used various methods of killing in the past, trying to perfect his approach to crime, he wouldn’t have noticed such details. He also wouldn’t have been confident enough to determine that the murderer was left-handed.

At this moment, Su Ming placed two photos of different victim body parts on the screen.

“Sheng Brother,” Su Ming said, “Although it sounds incredible to deduce clues from muscle texture and cuts, let me explain a bit…”

“You’ll understand why I arrived at this conclusion.”

With that, Su Ming pointed to the photo of the victim’s body part at the top of the screen.

This photo was of the first bag of body parts found, the one that the sanitation workers mistook for cooked beef and nearly ate.

“Sheng Ge, take a good look.”

“In this image, the victim’s body part has muscle texture that’s clearly deeper on the right and shallower on the left, with the cut more clearly defined on the right side.”

“Now, imagine this: a large piece of meat placed on a cutting board. Normally, when cutting meat, you start with more force because you’re not worried about the knife touching the board.”

“As you get to the last part, you subconsciously reduce the pressure to avoid making too much noise.”

“This is an automatic response, or unconscious behavior for everyone, and in the murderer’s case, they would be especially careful about the noise.”

“This difference in force used creates a situation where the part cut with more force will have clearer muscle texture and cuts than the part where the force was reduced.”

“When the murderer dismembered the victim, they would have been even more cautious than usual while cutting meat, which would lead to uneven force distribution.”

“Now, look at the body part in the picture.”

“The muscle texture and cuts on the right side are noticeably clearer than on the left, which, based on normal cutting posture, means the right hand held the knife.”

“This piece of information tells us that… when the murderer was cutting the victim’s body, they used their right hand to hold the knife.”

This gradual explanation made Xu Changsheng involuntarily suck in a breath, and he mimicked the cutting motion in the air, feeling the change in force.

Just as Su Ming had said, once he imagined the knife nearing the cutting board, he unconsciously reduced the force—a natural human instinct that’s hard to overcome!

After verifying this clue, Xu Changsheng took a sip from his goji berry water, put the cup down, and frowned even more deeply.

“Xiao Ming, your method of judging the dominant hand from the muscle texture and cuts…”

“I can almost agree with it 90%.”

“But I feel this criminal investigation technique has a very narrow application. After all, not many criminals would be as calm as the murderer in the dismemberment case.”

“Most likely, they wouldn’t have time to dispose of the body, let alone meticulously cook and carefully dismember it. Yet, here we are able to deduce the dominant hand.”

“However…”

“This is strange. According to this detail, the murderer’s dominant hand should be the right hand, not the left. So, how did Xiao Ming come to the conclusion that the murderer is left-handed?”

Although the application of this criminal technique was narrow, Xu Changsheng had still made solid progress, finding a key clue from the body photos taken twenty years ago!!!

Xu Changsheng had to admit that Su Ming’s talent for solving cases was truly terrifying.

After years of being a criminal investigator, he had never thought of…

Judging a person’s dominant hand by the difference in cutting force while slicing meat.

But his curiosity was growing.

Clearly, from the body parts, the dominant hand was the right hand, so how could Su Ming be so confident that the murderer was left-handed?

Before Xu Changsheng could wonder any longer, Su Ming pointed to the photo of the victim’s head at the bottom of the screen.

This photo showed the victim’s cooked head, presented from multiple angles, looking especially gruesome and terrifying—a sight enough to give nightmares to any ordinary person.

“Sheng Brother, take a good look at the cut on the neck.”

“By using the technique we just discussed to determine the cutting direction, you should be able to see clearly…”

“On both sides of the neck vertebrae, one side has more obvious muscle texture, while the other is blurry and less clear.”

“But this is different from the body parts we saw earlier.”

“On the neck, the muscle texture on the left side is more distinct, while the right side shows signs of the murderer reducing their force.”

“This means that the murderer used their left hand to hold the knife when dismembering the body and head, which gives us two completely different answers.”

“While cutting the body parts, the murderer used their right hand, but when cutting the head, they used their left hand.”

“It may seem hard to tell, but if you think about it for a second, the answer becomes clear.”

“Slicing body parts only involves muscle, so the murderer didn’t need much force. But when cutting the head, because of the presence of the spine…”

“The murderer had to exert much more force!!!”

At this point, Su Ming didn’t need to explain further.

Xu Changsheng slapped his thigh and suddenly realized, excitedly saying:

“When chopping hard objects or lifting heavy things, everyone instinctively uses their dominant hand to exert more force. This is inevitable.”

“So, by comparing the cutting of the body parts with the chopping of the neck bone, it becomes crystal clear…”

“The murderer’s dominant hand is the left hand, which is why they used their left hand to chop the bone.”

“The reason they used their right hand to cut the body parts was probably to deliberately conceal it, in an attempt to mislead the police and remove suspicion from themselves!”

“But why would they deliberately hide their left-handedness?”

“Although there are fewer left-handed people among the general population, it wouldn’t necessarily require hiding it—unless…”

At this point, Xu Changsheng paused for a moment, his eyes gleaming as he looked at Su Ming.

“Unless…”

“This murderer has a special profession, and the left-handedness makes it easy to identify them!!!”