Minor, hearing this answer, Zero Valley and Kazami Hiroshi were also silent.

This is indeed someone they "can't afford to mess with".

If the murderer is a minor, even if he is caught, he will not be able to receive the punishment he deserves.

And Lin Xinyi has more headaches than them:

Because he already knew that the 1996 law stipulated that the age of absolute criminal responsibility was two years older than the 14-year-old criminal responsibility period in his understanding

Yes, before the year 2000:

Minors under the age of 16 are not subject to any criminal liability.

It was not until 1997 that the "Serial Killings of Children in Kobe" provoked a strong social repercussion, and in 2000 the National Assembly lowered the minimum age of criminal responsibility from 16 to 14.

In the "Kobe Child Serial Murder Incident", the murderer "Juvenile A" who singled out elementary school students and used extremely cruel and bloody methods such as dismemberment and destruction of corpses to kill 2 people in a row and seriously injure 3 people.

Because he was only 14 years old at the time of the crime, he was released after being arrested and living in a juvenile reformatory for less than seven years.

In 2015, the murderer "Young A", who had long since returned to society, also wrote an autobiography based on his own experience, and it is said that he made a lot of money.

So....

In the face of juvenile crimes, Lin Xinyi only felt powerlessness:

"The 16-year-old years of criminal responsibility..."

"If my speculation is true, the biological age of the murderer will definitely be less than 16 years old."

"In other words, the only thing we can do..."

"It is to send him to a juvenile reformatory to help him reform and reintegrate into society in the future."

Lin Xinyi didn't know what the effect of the renovation of the juvenile reformatory was.

But think about it, the murderer "Young A" still has the face to publish an autobiography and eat human blood steamed buns when he grows up.... The effect of this ideological transformation is very questionable.

"Officer Lin..."

Kazami Yu also held on to a glimmer of hope, and asked deceptively:

"Could the murderer really be a minor?"

"Could it be that you guessed wrong?"

"I hope I'm wrong, too... But at present, the murderer is indeed a minor. ”

Lin Xinyi replied in a difficult tone:

"First of all, the footprints left by the killer on the lawn are smaller, which indicates that his identity is most likely a petite woman, or a minor."

"Secondly, the murderer hit the deceased with a metal hammer twice in a row during the sneak attack, but only caused minor injuries to the deceased, which can prove to a certain extent that he did not have much strength, was a weak woman, or an immature minor."

"Third, the murderer chose to break in and attack even though the lights were on in the house, which shows that he was extremely bold, impulsive, and reckless, which is also in line with the psychological characteristics of a juvenile murderer."

"In the end, the direction of the creation proves that the murderer's killing action was a downward stabbing, and when the murderer stabbed the deceased with a knife, the location of the hit was the upper right abdomen."

"And if it's an adult of normal height, raise the knife high and stab it down..."

Lin Xinyi tried to make a gesture of raising his knife over his shoulder in front of Officer Kazami.

With his height much taller than the average adult, if he stabbed at the target face to face in this way, the blade would only hit the neck and shoulder.

If you change to a shorter adult, it will only pierce your chest.

"But the murderer pierced the abdomen even lower."

"This shows that compared to the deceased Mr. Yamazaki, the murderer is much shorter."

"Mr. Yamazaki himself isn't too tall, if the murderer is much shorter... Then it can only be a minor. ”

Speaking of this, Lin Xinyi's face was already a little ugly.

But he still left himself some hope:

"Of course, because the positions of the two sides in the fight cannot be determined, it is actually not rigorous to judge the height of the murderer only from the location of the wound."

"So, I also have to do a more detailed and scientific investigation on the spot."

"If you're lucky... Maybe it can overturn my thoughts. ”

"This..."Officer Kazami was stunned for a moment: "Then if the investigation comes out, the murderer is really a minor?" ”

"......." was silent for a while.

Zero also set his eyes on Lin Xinyi, as if he was looking forward to the officer's answer.

"We are the police, we are the law enforcers."

Lin Xinyi sighed with a lonely expression:

"Let's do it according to the law."

...............................

The personnel and equipment of the forensic section were quickly sent to the scene.

Lin Xinyi changed into hair covers, shoe covers, masks, and protective clothing, and cautiously stepped into the scene.

And before he could go deep into the living room area where the crime occurred, he stopped at the entrance and pointed to the open villa security door and asked:

"Who opened the door to this villa?"

"I don't know." Officer Kazami shook his head: "This door was originally open. ”

"When the police arrived at the scene in the early hours of the morning, this was what the scene looked like."

"This..."Lin Xinyi frowned slightly.

He didn't say anything, just looked at the intact security door a little, and then carried a large investigation box into the villa.

Then, instead of scrutinizing the scene, he went straight into the bloodstained kitchen.

This is where the deceased was stabbed with the fatal stab.

Zero and Kazami Hiroya followed curiously, they all wanted to see what magic weapon this forest administrator's box contained.

And then...

I saw Lin Xinyi take out a ruler, pencil, eraser, calculation paper, and calculator.

"This...", the well-informed Mr. Shimiya couldn't even understand: "Mr. Lin, you... Is this going to be a math problem? ”

"It's just about doing math."

Lin Xinyi nodded seriously.

He pointed to a splattered blood stain on the wall next to the deceased's body:

"This is a splatter-like blood stain formed by the rupture of a human artery, and the splattered blood stain often indicates the first scene, that is, the starting location of the harm."

"If you find the splattered blood, you can probably find the location of the moment when the deceased was stabbed."

"The autopsy report mentioned that there was an obvious mobile wound inside the wound of the deceased, and the skin on the surface of the wound was also characterized by a large pull to the upper side."

"So it can be roughly judged that the moment the murderer drew the knife, the deceased's body was still moving downward."

"In other words, after the murderer stabbed the deceased in the body, he immediately pulled the knife out."

"And the blood in the deceased's body spurted out a lot at this time."

"So as long as we can confirm the height of the blood splash point, we can indirectly confirm the position of the deceased when he was stabbed, so as to determine the approximate height of the murderer."

"Uh...."Falling valley and Kazami were at a loss when they heard this:

"The height of the blood splattering point ... How can this be confirmed? ”

"By doing math problems."

Lin Xinyi said as he took a ruler and carefully measured the length and width of those splattered blood droplets:

"Blood droplets form traces when they touch the object, and if the surface of the object is smooth and flat, the shape of the blood stain is either round or oval."

"That is, the overall shape of the droplet bloodstain is oval."

"One side of the oval shape is smooth, and it is called the head."

"On the other side, a small tail-like mark will form, which is called the tail."

"Based on the morphology of the droplet of blood, it is possible to determine the angle at which the blood droplet touches the object."

"The greater the distance between the long and wide sides of the oval, the smaller the angle at which the blood droplets touch the object."

"Oh..."Falling Valley Zero nodded thoughtfully, "I see, I see." ”

Kazami: "??? ”

What do you understand?

How don't I understand?

He was still at a loss.

Falling Valley Zero smiled lightly:

"What Mr. Lin means is to measure the ratio of the minor axis to the major axis of the ellipse first, and then determine the angle of incidence corresponding to the ratio according to the sinusoidal function."

"It's just junior high school math."

"Kazami, if you remember the ballistic calculation method taught in sniper class, you can easily understand this knowledge."

"You can also use a sniper rifle?"

Lin Xinyi interjected curiously.

"This is our training course for the police." Drop Valley replied noncommittally.

"That's good."

Lin Xinyi unceremoniously handed him paper and pen, as well as a calculator:

"I'll measure it, you will calculate it, speed up the work."

An agent who can even calculate the trajectory of a sniper will never even get the calculator wrong.

So he relieved himself to hand over the work of arithmetic to Zero Valley, and instructed in passing:

"Don't miscalculate."

"Every drop of blood must be measured and calculated accurately, otherwise the final error will be quite scary."

With that, Lin Xinyi continued to work hard.

It's a tedious task:

He had to first select a bloodstain concentration area, and then measure the length and width of each blood drop in the concentration area, and calculate the angle of incidence.

The direction is confirmed according to the "head and tail" of the oval blood droplet, and then according to the directionality and incidence angle of the blood stain, the "pull line method" is used to locate the blood.

Fix a segment of the thread at the end of the bloodstain, and the fixation point is located at the end of the bloodstain on the long axis of the bloodstain facing away from the tail of the bloodstain.

The line is then extended in reverse along the calculated direction and angle.

Eventually, the intersection of several bloodstain extension lines above the plane is where the bleeding point is.

This work is very detailed and cumbersome, prone to errors, and the operation of pulling multiple lines together is extremely complicated.

The difficulty of its operation is so great that I am afraid that even in this world, those strange murderers who have eaten the "fruit of the thread" have to bow down.

If it is in the future, it is completely possible to use the "computer program method" to replace this cumbersome "wire pulling method"

You only need to take a digital camera picture of the bloodstains at the scene, and then put the photos into the bloodstain analysis degree, and the results can be obtained quickly.

But in this era, the mobile phone is still Nokia, and Lin Xinyi can only use this method.

Only with the utmost care and exertion can the location of the bleeding point be found relatively accurately.

Lin Xinyi was busy like this.

He carefully squatted in front of the bloodstain, carefully measuring, calculating, and pulling the threads, even though his forehead was covered with sweat, he did not stop working.

Finally, the results are in.

"Calculate the height of the bleeding point, and judge the height of the murderer by linking the angle of the knife and the height of the deceased..."

Lin Xinyi felt helpless for this result:

"Maybe not even 1.5 meters."

"I'm afraid, this guy is just a middle school student."

"It's... Middle school students? ”

If you are a junior high school student, you must be less than 16 years old.

Kazami Yuya still wants to escape this answer:

"Mr. Lin, could the murderer be... Congenital dysplasia? ”

"Do you say it's a dwarf?"

"It's not impossible."

Lin Xinyi sighed deeply, and his tone became more complicated:

"But think about it, if you're an adult and you know you're short and don't have a lot of strength."

"Do you dare to break into someone's house with a hammer and attack a able-bodied adult male?"

Officer Kazami had nothing to say:

Indeed, the murderer is not only short, but also floating.

What's even scarier is...

"The murderer has this kind of confidence, in addition to being impulsive at a young age, it is also very likely that it is because he knows that he is a minor:"

"He knew that even if he broke into the house with a weapon and killed someone, it would be a success or a failure..."

"No one else can do anything about him."