The crackdown on organized crime began with the arrest of the mother-in-law.

Stride length...

Step angle...

Step length...

Center of gravity...

Everyone has heard of footprint identification and analysis.

I also know that some ruthless people can obtain a lot of information about suspects based on their footprints.

But who are those ruthless people?

Which one of them isn't a provincial-level expert on official business?

Which one of them isn't gray-haired and has experienced the trials of thousands of cases?

But Qin Chuan's?

It's only been a month since I graduated.

Are police academies all this awesome these days?

They'll even say they're terrible.

Everyone's attention, including Zhou Xuexi's, shifted from Qin Chuan to Song Yang and Chen Dejun.

The meaning is obvious.

You two are on-site investigation police officers, specializing in administrative on-site investigations.

Tell me, is Qin Chuan right or wrong?

But the two of them were now staring blankly at Qin Chuan, like wooden puppets.

It seems like we can't count on that.

Dong Houde, the captain of the third squadron, was the first to react.

In the criminal investigation team, he was known for his resourcefulness.

"Captain Qin, even if the information you got about the murderer from the footprints is correct, there are many people with similar height and weight. Why are you specifically referring to the woman across the hall?"

"Good question!"

Qin Chuan wanted to give Dong Houde a thumbs up.

What's there to be afraid of when you're showing off?

The worst thing is having no one to cooperate with.

Now, the supporting character has finally spoken up.

“You’re right. Footprint analysis can only narrow down the suspect’s general area. Without a comparison of the other person’s footprints, it is indeed impossible to directly identify a specific person.”

"But look at these two footprints."

Qin Chuan chose the footprints that were near the entrance, from the outside in.

"These are the footprints left by the murderer after entering the room. The right foot is clear, the left foot is blurry, and the center of gravity is obviously off to the right."

Everyone peered over and saw that it was indeed the case.

"Why is this happening?"

Dong Houde cooperated very well and raised questions in a timely manner.

"Because the murderer has a disability in his left leg!"

Wow!

These words caused a stir among the crowd.

Moreover, the way he looked at Qin Chuan gradually changed.

Because the woman living in apartment 302 across the hall does indeed have a disability!

Could it be that Qin Chuan was telling the truth?

“Captain Qin, what you said makes sense, but… look at this string of footprints.”

Dong Houde's ability to become a squadron leader shows he's no incompetent fool.

"These footprints, with the toes pointing outwards, must be the footprints of the murderer when they left, right?"

Qin Chuan nodded; Dong Zhijun was indeed right.

The murderer's footprints when entering the room showed the toes pointing inwards.

When leaving, point your toes outwards.

Very easy to distinguish.

Dong Houde continued to ask, "But why are the left and right footprints about the same clarity?"

"It's impossible for the murderer to have been disabled when he came in and not be disabled when he left."

Yup!

Everyone nodded.

"Captain Dong is right. It's impossible for the murderer to have been disabled when he came in and then be fine when he left."

"Yes, that doesn't make sense."

"Could Captain Qin have made a mistake?"

"Don't rush, let's hear what Captain Qin has to say."

Sure enough, Qin Chuan waved his hand, signaling Dong Zhijun not to rush.

"Captain Dong, before answering your question, I'd like to ask everyone a question."

"Does anyone know how much an adult's head weighs?"

Ok?

this problem……

Although everyone present was a criminal police officer, they didn't really know much about this.

Zhou Xuexi frowned slightly.

He didn't understand why Qin Chuan asked that question.

However, he had once been involved in a case involving a headless corpse.

I've checked the information here.

"An adult's head typically weighs between 4.5 and 5.5 kilograms."

Qin Chuan was surprised that it was Zhou Xuexi who gave the answer.

He had assumed that forensic pathologist Chen Guangzu would know.

But the other person didn't say anything.

This also proves once again that Chen Guangzu's examination of Dong Zhijun's body last time was not a deliberate attempt to frame him.

He really isn't capable.

"Director Zhou is right."

"The weight of an adult's head is indeed within this weight range."

"Of course, some particularly obese people may exceed the maximum weight of 5.5 kilograms."

"However, regardless of whether a person is fat or thin, the weight of a person's head should be about 7.7% of their body weight."

"The deceased, Zhang Jun, was 170 cm tall and obese, with an estimated weight of 70 kilograms."

Therefore, his head should weigh around 5.3 kilograms.

"Now, let's talk about why the clarity of the footprints on the left and right feet was not much different when the murderer left."

"Because, when the other party left, he was carrying the victim's head in his left hand!"

"The weight of 5 kilograms completely erased the difference in the footprints of the killer's left and right feet caused by his disability."

I grass!

Is that what happened?

Everyone suddenly realized.

"I don't think so."

But at that very moment, a voice drifted over.

Zou Mingyi!

Zou Mingyi wasn't deliberately picking a fight; he genuinely felt something was off: "Generally speaking, people usually use their right hand to lift things, especially heavy ones."

"So why did the murderer insist on holding the head with his left hand?"

I grass!

As expected of a leader.

This is a good question.

Who says a murderer has to carry things with their left hand?

You should use your right hand.

Everyone looked at Qin Chuan again.

I want to see how he explains it.

Qin Chuan looked at Zou Mingyi with a strange expression.

He thought that this time no one would act as a shill for him.

Just when I was wondering how to bring out the most pretentious part, Zou Mingyi unexpectedly provided the assist!

"Secretary Zou is right!"

Qin Chuan raised his right hand.

"Normal people usually use their right hand to lift heavy objects, but..."

Qin Chuan raised his left hand again: "What if the other person is left-handed?"

left handed?

Without waiting for anyone to raise any questions, Qin Chuan walked directly into the room and stood next to the deceased's neck.

"There were obvious saw marks on the victim's neck, indicating that the murderer used a hacksaw or similar tool to saw off the victim's head."

Qin Chuan looked at forensic doctor Chen Guangzu: "Forensic doctor Chen, am I right?"

Although Chen Guangzu's abilities were indeed lacking, he did have some discernment.

"The killer did use a saw to cut off the head."

"As everyone knows, the teeth of a saw are all in one direction. Look at the direction of the teeth on the wound on the deceased's neck."

Qin Chuan stood up and made a gesture as if he were holding a saw.

"Based on the direction the victim was lying, the murderer must have been holding the saw with their left hand to create the serrated wound in that direction."

Qin Chuan looked at Chen Guangzu again: "Forensic Doctor Chen, am I right?"

"Captain Qin, you're right."

Chen Guangzu nodded vigorously.

Qin Chuan stood up and left the corpse.

Looking at Zou Mingyi at the doorway, he said, "So, based on the wounds on the corpse's neck, I judge that the murderer is left-handed."

"Therefore, when the murderer left with the head, he must have been carrying a heavy object in his left hand!"

Qin Chuan's series of analyses cannot be said to be reasonable and well-founded.

It can only be said that it is quite reasonable and well-founded.

As Qin Chuan explained, he had already arrived at the door of apartment 302 across the street.

"If I'm not mistaken, the deceased's head is probably frozen on the bottom shelf of his/her refrigerator right now."

Click.

Upon opening the door, what greeted everyone's eyes was the extremely pale-faced woman of apartment 302, who had collapsed to the ground.

Clearly, the other party had overheard all of Qin Chuan's analysis through the door.

Qin Chuan put on gloves and went straight to the refrigerator in the kitchen.

Zhou Xuexi and Zou Mingyi followed closely behind.

Stab it!

Qin Chuan opened the refrigerator door to the bottom freezer compartment and pulled open the bottom shelf directly.

A head with its eyes wide open lies quietly inside.

His pale pupils stared at the three of them!