Coroner Coroner

"Well, that should be it."

Hayashi Shinichi took the stone from Hattori Heiji.

Hearing this all the time, Hattori Heizo seemed to no longer feel distressed about the vase.

He looked at his detective son with great interest, and followed Lin Xinyi to learn how to analyze the traces of the scene scientifically, and his eyes could not help but feel full of relief.

"Exactly..."

"Manager Lin, Heiji."

Hattori Heizo said with great interest:

"Take this as a training session—"

"Use the power of criminal science to find the prisoner who smashed the vase!"

Chapter 276 The identity of the prisoner

Someone threw a stone in from the outside, whether it was a big deal or a small thing.

After all, this is the home of the head of the Osaka Police Headquarters.

If the prisoner who threw the stone was acting maliciously, he might do something worse next time.

"Well, then let me and Heiji find him!"

Hayashi Shinichi promised to find the truth with Hattori Heiji, which is also a practical training for the students.

Mao Lilan does not need to participate in this training——

After these days of study and practice, regardless of experience, her knowledge of trace inspection is not much worse than that of teacher Lin Xinyi.

"First of all, this stone..."

"There is a little dirt on it, and the dirt is still damp."

This point does not need to be taught by Hayashi Shinichi. With the eyesight of a detective, Hattori Heiji quickly came to a conclusion:

"This stone was just picked up by the prisoner from the courtyard."

"Yeah." Lin Xin nodded: "Let's go to the courtyard now."

In this way, led by Hayashi Shinichi and Hattori Heiji, everyone walked out of the mansion.

Walking into the courtyard, before reaching the lawn outside the window of the collection room, Lin Xinyi took the lead to stop:

"Everyone, don't get too close, so as not to destroy the traces of the scene."

"Since there is fresh dirt on the stone, the murderer should have stood on the lawn with dirt and threw the stone just now."

As he spoke, he led Hattori Heiji carefully around the large lawn.

The visibility at night is already poor, and the grass on this lawn is trimmed very flat and low, so even if there is a lodging formed by trampling on it, it is difficult for people to see it.

Lin Xinyi fumbled and took out a flashlight to enhance the lighting, and at the same time, he was ready to spend a lot of effort to identify.

Then, just listen to Hattori Heiji say:

"Mr. Lin!"

"I found the prisoner's footprints on the lawn—"

"There are a series of traces of fallen grass blades. It should be trampled out!"

Lin Xinyi: "..."

I didn't even take out this flashlight. It's a shame you can find it with your naked eyes.

Lin Xinyi found out...

In the future, as long as you bring a famous detective to handle the case, the on-site investigation department can almost be disbanded.

"very good…"

"From this afternoon to night, no one should have stepped on this lawn, right?"

"Grass has a strong self-healing ability. Even if it is trampled down, it only takes half a day to 'stand up' again."

"If it is in a sunny place with sufficient light, it may only take a few hours for the grass to fall and repair."

Lin Xinyi took the opportunity to popularize science for his students:

"So as long as no one has stepped on this lawn from afternoon to night, then the 'lodging footprints' on this lawn should be left by the prisoner just now."

He briefly asked everyone present, and the answers he got were that he had never been to this lawn.

Obviously, this string of footprints can only belong to the prisoner.

"Look at the direction of this series of footprints..."

Lin Xinyi squatted down with a flashlight to observe carefully, and at the same time did not forget to test Fubu Heiji:

"Heiji, you should know how to judge the whereabouts of the footprints on the grass, right?"

"of course."

"Tracking is the basic ability of a detective!"

Hattori Heiji's knowledge in this area is extremely rich:

"It is mainly judged based on the direction of the grass lodging and the ground marks."

"For example, after people step on this relatively low grass:"

"The tip of the sole of the foot will overwhelm the grass forward, and the tip of the toe will have sliding marks;"

"The grass on the heel will also fall forward, and the tip of the grass will break forward."

"On dewy nights like now, there will be dirt stuck to the blades of grass on top and bottom of the grass."

"Yes."

Lin Xinyi nodded in satisfaction:

"Let's keep watching."

"Bring the tape measure over and measure the prisoner's stride length."

The footprints on the lawn are almost impossible to extract, and because of the grass as a mat, many footprint features are not visible.

But at least, the distance between each lodging footprint, that is, the step length, can still be seen.

"For three consecutive footprints left during normal walking, the distance from the rear edge of the heel of the first footprint to the rear edge of the heel of the third footprint is the single step length."

"Substitute 'footprint length' and 'single step length' into the formula..."

"You can roughly calculate the prisoner's height."

Hayashi Shinichi taught Hattori Heiji this way.

And Hattori Heiji was dismissed by him, doing the drudgery of lying on the ground and measuring the step length with a tape measure:

Anyway, he has a good eye, and the error in the measurement is small.

"Step length + 1/2 footprint length."

"Based on this calculation, the prisoner's height should be 165cm."

Hattori Heiji gave a conclusion.

But Lin Xinyi shook his head and taught:

"In our line of work, words must always be rigorous."

"The number cannot be accurate to 165cm, because the height calculated by this method often has a large error."

"It should be said that the prisoner's height is in."

"His height falls within that approximate range."

"Leave a 10cm error?" Hattori Heiji was a little puzzled: "The scope of the investigation is so large, isn't it the same as not guessing the height?"

"For the sake of prudence, the error must be left larger."

"It's better to check more targets than accidentally miss the target."

Lin Xinyi said calmly:

"Of course, in the actual investigation process, the priority is to check the target closer to the calculation result of 165cm."

"oh, I understand now."

Hattori Heiji understood Lin Xinyi's meaning, and immediately followed Lin Xinyi's footsteps to check:

Soon, they found a strange footprint in the middle of the lawn:

"This lawn has been shoveled and bald."

"And the grass stalks did not fall down, but broke, and many broken grass blades flew to the front of the footprints."

"And the front of this kick mark is exactly pointing in the direction of the collection room."

"Could it be that the prisoner..."

Hattori Heiji imagined the scene at that time:

"That prisoner didn't throw the stone in."

"After he kicked the stones off the grass, the stones flew into the collection room and smashed the glass and vases?"

"It's very likely that..."

Lin Xin nodded, his expression became a little weird:

"Besides, that prisoner's strength is really extraordinary."

"Leave aside this piece of turf that was almost bald by his foot..."

"Just use this kicking method to kick a small stone at a speed comparable to that of a slingshot..."

He paused slightly, and Mao Lilan's figure flashed in his mind again:

"The power needed may not be possessed by normal people."