Chapter 540 Artificial intelligence solves the case

Chapter 540 Artificial intelligence solves the case

Regardless of whether Miyano Shiho is really in the hands of the Japanese police, the inexplicable understanding of Miyano Akemi by Officer Furitani is true.

This made Akai Shuichi quite concerned.

Even putting aside the delicate personal feelings, as an FBI investigator, he did not want to see that the Japanese police had too much information about the Miyano sisters.

This is not good news for him or the FBI.

But what he got from this operation was not entirely bad news.

Just through a few brief conversations between Lin Xinyi and others when they were surveying the site, Akai Shuichi had already analyzed and deduced the information he wanted to hear most:

Miyano Akemi is not dead.

At least, she wasn't the nameless female corpse.

She must have hidden the stolen money and the suicide note somewhere in order to cope with the organization's pursuit.

The money was later discovered and embezzled, which led to this murder case caused by billions of stolen money.

Neither the deceased nor the murderer in the whole case should have much to do with Miyano Akemi.

This made Akai Shuichi sigh in relief.

Although the suicide note still brought a lot of bad vibes, as long as he didn't see Miyano Akemi's body with his own eyes, the hope in his heart would not disappear.

Maybe there's still a chance to find her.

And the only clue to find her is still in this case.

Akai Shuichi wanted to find the murderer and ask him where he got the billion yen in stolen money and Miyano Akemi's suicide note.

To do this, we must solve the murder case that is still shrouded in mystery.

"Leave it to the forest manager."

Lin Xinyi's achievements as a police officer are obvious to all, and Akai Shuichi believes that the other party will only be more professional than himself in the field of criminal investigation.

So he made up his mind to "mantis stalk the cicada" and hid quietly in the dark, waiting for the forest manager to help everyone solve the case.

Lin Xinyi did not disappoint.

After he found that he could not get more information from Officer Fangtani, he naturally turned his attention back to the investigation of the crime scene.

And after some meticulous investigation,

"Mr. Lin, here."

Officer Fangtani sighed softly:

"It seems there are no more clues to find here."

Yesterday, Lin Xinyi estimated that the approximate time of death of the deceased was between 9 and 17 days ago.

Today this range has grown to 10 to 18 days.

After about ten days of wind, rain, sunshine, and all kinds of animal activities, the crime scene was completely destroyed.

Although the Gunma County police responsible for the front-line investigation were careless, the reason why they did not gain much during the investigation was largely because there were not many clues to find at the scene.

Lin Xinyi and others came here to investigate again. After most of the day's investigation, they only found some shotgun pellets and a small paper ball.

Although this can be considered a major breakthrough, it proves that this is the scene of the first crime.

But just knowing this is obviously not enough to help the police find the murderer in the vast crowd.

"Yeah" Lin Xinyi also quietly fell into deep thought.

Officer Fangtani asked him for advice, but now his mind was empty.

There is no way. This kind of headless case that happened in the wilderness will still be difficult for future forensic doctors to investigate.

"what can we do about it"

With a headache, Lin Xinyi quickly gave up thinking.

Because his past work experience told him that in this situation with insufficient clues, there is no point in thinking more.

A clever woman can't make a meal without straw, and clues must be found to break the situation!

"Is it true that no more clues can be found at the scene?"

Lin Xin once again turned his attention to this forest land that seemed to have nothing strange about it:

Streams, stones, trees, soil, blades of grass.

Everything seemed so normal.

The investigation seems to have reached a dead end.

"Wait a minute." While strolling through a patch of grass, Lin Xinyi suddenly discovered something:

"There are several grasses in this patch of grass that have been pulled out."

"Huh?" Belmode and Officer Fanggu were slightly stunned.

They came forward curiously and took a closer look:

Sure enough, under the lush grass blades and on the dark soil, there were indeed many small grass stalks that had been uprooted and thrown away, and finally buried among the grass blades.

They all looked dry and yellow at this time, and they had obviously been pulled out of the soil for a long time.

"Animals don't pull weeds when they have nothing to do."

"This is a trace left behind by human activity."

Lin Xinyi explained with bright eyes:

"Look at this stone next to the grass. Is it suitable for people to sit and rest?"

"This" Officer Fang Gu understood what Lin Xinyi meant: "You mean, someone was sitting on this rock and resting in a daze."

"Then you pulled out these blades of grass because you were idle and bored?"

"That's right." Lin Xin nodded:

Only people would be too idle to do such meaningless things.

And this person who was once so bored that he sat here pulling weeds to relieve his boredom is probably...

"It's the murderer, or the deceased."

"I have guessed before that both the murderer and the deceased may be familiar with this mountain forest."

"It's possible that they made an appointment in advance to go up the mountain separately and then meet at this place."

"And since two people have agreed to meet here, some will arrive early and some will arrive late."

"Those who arrive early may sit on this stone to rest. After a long time and become impatient, they may become bored and pull out a few grass blades in front of them."

This trace of humans resting and waiting here further confirms Lin Xinyi’s previous guess.

He believed that the murderer and the deceased had arranged to meet here.

One of them arrived at the scene earlier and sat on the stone to rest and wait.

"This" Officer Jiang Gu felt that Lin Xinyi's guess was too unreasonable.

Vulnerabilities can be found as soon as you look for them, for example:

"Mr. Lin, how can you be sure that these blades of grass were pulled out by the murderer at the time of the crime or when the deceased was resting?"

"You know, Gunma County police also came here a few days ago."

"Maybe these grasses were pulled out when they were tired from surveying the site and were sitting here to rest."

"There are also those hikers who found the bodies. They have also been here and may have sat here to rest."

"I can rule out both of these theories."

Lin Xinyi said calmly.

I saw him squatting down slightly, picking up a blade of grass and saying:

"This thing is called the little fluffy grass, also called the Canadian flying fluffy grass."

"It is an invasive species native to North America and is now widely distributed in the mountains and forests of East Asian countries."

Small fluffy grass is also widely distributed in China.

Lin Xinyi once used this plant as a clue to solve a crime during a field survey, so he had a relatively good understanding of the growth habits of the sedge.

"This kind of small fluffy grass can grow to 70130cm or even higher in its adult stage."

"But the small patch of grass we see now is generally only about 10cm, and it is still in the juvenile stage."

"And these uprooted shamrocks are even shorter."

"They stopped growing after they were pulled up, so compared to the surrounding small grasses that had grown to 10cm in the same period, these withered yellow grass stems after being pulled out were only 4 or 5cm in length."

"This" Officer Fang Gu quickly understood: "Mr. Lin, what do you mean?"

"By comparing the length of these dry grass stems with the height of those that have always developed normally, we can roughly determine when those small grass stems were uprooted?"

"That's right." Lin Xinyi explained nonchalantly:

"The growth period of Xiaopengcao is about 6 months. In late March every year, the leaves and stems are tender and the stems are 24cm long. In early April, the stems are 510cm long. Then it enters the growth period and grows rapidly."

What he memorized was data from a certain place in China, so there would definitely be errors when copied.

But now it is enough to have a rough time range, and it doesn't matter if the error is larger.

The climate change in this mountainous area in the past month happens to be similar to the wild climate in March and April every year in a place in China that is the source of Lin Xinyi's data.

So Lin Xinyi copied the data and used it:

"The length of the dead grass that has been pulled out remains at 4 or 5cm."

"The live grass growing normally next to it has now grown to 10cm."

"According to the growth habits of the little fluffy grass, it is not difficult to judge."

"The time when these grasses were uprooted from the soil should have been 10 days ago or within 20 days."

It takes 10 to 20 days for the grass blades to be pulled out.

The approximate time of death of the deceased is 10 to 18 days.

The two time periods coincide with each other.

And since the blades of grass were pulled out at least 10 days ago, it couldn't have been pulled out by those hikers or the Gunma Prefecture police who just arrived here a few days ago.

"The person who is most likely to sit here and rest, pulling out these grass stems out of boredom, is the murderer or the deceased!"

Lin Xinyi gave his own conclusion.

But Officer Fangtani still hesitated:

"Although the officers of the Gunma Prefectural Police and the hikers who discovered the body are excluded."

"But this does not completely prove that these blades of grass were pulled out by the murderer and the deceased."

"What if another group of hikers came here before the incident and sat here to rest?"

"It's very unlikely."

"After all, this forest is not close to the mountain road, so even hikers may not come here."

"It's a very small chance that a group of hikers could accidentally break in and find a body."

"It would be too much of a coincidence to say that another group of hikers had been here before the incident."

Lin Xinyi knew that even if the possibility mentioned by Officer Fenggu was small, it was indeed a possibility.

This possibility cannot be ruled out.

"But we don't need to rule it out either."

Lin Xinyi smiled:

"All we need to know is that the murderer or the deceased might have been sitting here, waiting, and pulling weeds impatiently."

"With this guess and this possibility, we have the direction for the next step of investigation."

"Oh?" Officer Fang Gu was a little confused:

It is known that one of the murderers or the dead may have been sitting here waiting.

This seems to be able to barely confirm that the murderer and the deceased did not come here at the same time, and prove Lin Xinyi's previous guess that "the murderer and the deceased made an appointment in advance to meet here", right?

But even if these speculations are true, so what?

Would knowing that some of them had rested here and that they had arranged to meet here in advance really help solve the case?

How can we help the police find the identity of the murderer and the deceased among the vast crowd?

Officer Fangtani was a little confused.

He cast curious and expectant eyes on Lin Xinyi.

Lin Xinyi did not answer directly.

He just took out his mobile phone and smiled mysteriously:

"Officer Fangtani, wait."

"I'll send a text message and ask my friends to check it for me."

"If we're lucky enough, this case might be solved soon."

Officer Fang Gu: "???"

With the few clues they have, they don't even have a clue about the identities of the deceased and the murderer.

How could this case be solved directly?

Even in his mind, he couldn't help but feel a little confused.

But Lin Xinyi knew that this was not because Officer Jianggu was not quick-witted, but because he usually mainly did intelligence work and lacked experience in criminal investigation techniques in this area.

This experience is the experience of using information and communication technology to solve crimes.

To put it simply, it is to check the mobile phone number.

According to Lin Xinyi’s conjecture and deduction:

Since the murderer and the deceased had made an appointment to meet in this wilderness, in order to keep in touch, it was impossible for them not to bring their mobile phones.

And if they brought their mobile phones, one of them would arrive early and sit on the rocks waiting, so bored that he would pull grass to pass the time.

Then the person who arrived first was impatient to wait. Wouldn't he take out his mobile phone and call to ask when the other party would arrive for the appointment?

And if the murderer and the deceased called each other on this mountain, then

"Noah's Ark."

"Can you help me check all the call records of the local telecommunications company in the past 10 to 20 days?"

"The address is XX Village near Haruna Mountain in Gunma County, the forest outside the village."

"There is a signal base station in this mountainous area."

"I want you to check whether any of the call parties dialed through this base station in the past 10 to 18 days has been registered as 'missing' in the police system recently."

Lin Xin sent his question to the artificial intelligence assistant via text message.

Noah’s Ark responded quickly:

"sure."

"I can help you check all call records that were relayed through the local signal base station within 10 to 18 days."

As long as the mobile phone card is activated, the mobile phone will usually automatically connect to the base station closest to it with the best signal.

As long as someone makes a call here, the corresponding dialing record will be left on the local base station.

As long as the call record data of the telecommunications company is retrieved, we can know who made calls to whom at a certain base station in a certain area during a certain period of time through this base station.

The principle is actually very simple.

It's not technically difficult either.

But the reason why Officer Furitani and Bermodichi didn't think of this at this time is that

In this era of underdeveloped communications, and even in the future with advanced technology, very few people solve crimes through this method.

Because in densely populated areas such as cities and rural areas, a base station may record tens of thousands of incoming and outgoing calls every day.

The base station can only record the dialed number, but cannot record the content of the call. It is simply impossible to find the call that the murderer made from so many dialing records.

Because of this, this "stupid method" of confirming the murderer's phone number by checking the massive dialing records of the base station rarely has the opportunity to appear in any era.

Officer Furitani and Belmode had never seen this method of solving crimes before.

That's why they can't figure out these joints.

However, Lin Xinyi has studied many classic cases in his long career and knows that in sparsely populated rural areas, he can try this method of checking base station dialing records to confirm the phone number of the person involved.

Because in the vast and sparsely populated countryside, a base station with a signal coverage of several kilometers may only add up to a few call numbers every day.

It is naturally not difficult to find the person you want to find from several call records.

But now, this place is not only in the countryside, but also in the mountains.

According to the B\u0026B owner, there is only one signal base station within a few kilometers of entering the mountain.

The only people who make calls through this base station in the mountains are usually hunters and climbers looking for excitement.

There are not many tourists who dare to venture into the mountains. It may take ten days and a half to get a group of them.

Coupled with the approximate death time range given by Lin Xinyi, the scope of investigation has been narrowed down to 10 to 18 days.

Think about it, not many people have made phone calls in this deep mountain within 10 to 18 days.

Sure enough, Noah's Ark quickly provided the search results:

"Mr. Lin, I found:"

"In the past 10 to 18 days, there is only one dialing record made through the signal base station you mentioned."

"The time was 13 days ago, from 1:13:31 to 1:15:07 in the afternoon."

"The number was dialed from the 'mountain base station' you mentioned."

"The base station where the call recipient is located is also this base station."

"Only one?" Lin Xinyi was surprised and typed quickly on the keyboard in response: "And the person who answered the phone was also within the signal coverage of this base station at the time?"

This means that the two people who called and answered the phone were both on this mountain, not far apart.

This is exactly consistent with what Lin Xinyi previously deduced, "the murderer and the deceased made an appointment to meet here, and the first arrival waited for a long time and called the other party to inquire."

This alone can basically confirm that the call was made between the murderer and the deceased.

But this still needs to be proven——

The most direct way to prove it is:

"Noah's Ark."

"Did you find out that any of the parties to this call were registered as 'missing' in the police system?"

The deceased had passed away quietly for more than ten days.

In the ten days since she was "missing", her relatives and friends may have reported the case to the local police nearby, causing her to be registered as a "missing person" in the police system.

Just compare the identity information of the owner of the mobile phone number with the national missing persons records to see if there are any identities that match each other.

It can prove whether the two people who were on the phone in the mountain at that time were the deceased and the murderer in this case.

The identity of the deceased and the identity of the murderer can also be easily determined.

This isn't technically difficult.

For Noah's Ark, an artificial intelligence that can be called an alien creation, this should be a piece of cake.

But what Lin Xinyi didn't expect was...

"Feel sorry."

Noah's Ark gave a negative answer:

"The mobile phone numbers of both parties on the call were not registered with their real names."

Lin Xinyi forgot. In this day and age, real-name registration is not required to open a mobile phone number.

If you want to find out the identity of the owner from the mobile phone number, you have to spend some extra effort.

And the most important thing is

"You made a mistake."

There is helplessness between the lines in Noah's Ark:

"As far as I know, your country has not yet established a nationwide networked police data system."

"Including the Tokyo Metropolitan Police Department, many places still use paper documents to record data."

"The 'missing persons database' you call simply does not exist."

"However, in the name of the Tokyo Metropolitan Police Department, I can help you send investigation assistance emails to local police stations across the country, asking them to fax over their respective missing persons files."

"Of course, these paper materials," Noah's Ark added with disgust, "you have to read it yourself."

Lin Xinyi: "."

"Okay." Lin Xinyi finally realized that he was temporarily excited and his spirit "traveled back".

Noah's Ark may be science fiction, but it's still behind the times.

This artificial intelligence was born a little too early.

Otherwise, it will become Skynet in a minute, and controlling the world will not be a problem.

Now Noah's Ark cannot help, and Japan does not yet have a nationwide online missing persons database. So what should we do?

Are you really going to look through those paper documents that were faxed over?

When will it be turned over?

Just thinking about the sea of ​​paper in the book made Lin Xin's scalp numb.

"Noah's Ark, is there no other way?"

"Yes." The artificial intelligence replied: "I can help you try to retrieve the text message records of these two numbers, and try to confirm the identities of the two phone number owners through intelligent analysis of the text message conversation content."

"But it will take some time."

"And beyond that."

Noah’s Ark quickly gave another solution:

"I can also help you locate those two mobile phone numbers and determine the approximate location of the owner."

These days, mobile phones don’t have GPS installed.

But Lin Xinyi knew that the mobile phone positioning mentioned in Noah's Ark should refer to the base station positioning method that already existed in this era:

Typically, in a city, a mobile phone will be covered by multiple base stations.

The mobile phone will "measure" the downlink pilot signals of different base stations to obtain the signal TOA (time of arrival) or TDOA (time difference of arrival) of each base station.

Based on this measurement result, combined with the coordinates of the base station, the coordinates of the mobile phone can be calculated.

The error of this positioning method is generally more than 100 meters.

Moreover, the fewer base stations in the target area, the greater the error.

If it is in a sparsely populated mountainous area with only one signal base station within a few kilometers, then the error can be as large as several kilometers.

This method of mobile phone positioning will definitely not be too accurate.

But if the approximate location of the murderer can be known through mobile phone positioning, it will be more or less helpful in solving the case.

So Lin Xinyi waited expectantly for Noah's Ark's response.

Not long after, Noah's Ark sent him another text message:

"Among the two mobile phone numbers I called in the mountains that day:"

"Mobile phone number xxxxxxxx is turned off and has no signal."

"The records show that the last time it was connected to the Internet was 13 days ago, at 3:32 minutes and 18 seconds in the afternoon."

"This" Lin Xinyi realized what:

That call happened in the afternoon 13 days ago.

One of the people on the call at that time actually turned off his phone after that afternoon.

"I'm afraid this is the cell phone of the deceased!"

"After killing her, the murderer must have taken her mobile phone away from the scene and disposed of it."

Lin Xinyi was even more certain that the two parties on this phone call were the murderer and the deceased in this case!

"What about the second mobile number?"

"This should be the murderer's mobile phone number——"

"Where is the murderer now?"

Noah’s Ark quickly sent a reply:

"The second mobile phone number is currently active and the base station to which this mobile phone number is connected."

"Mr. Lin, this is the base station you are using now."

"What?!" Lin Xinyi was shocked:

The murderer's cell phone is now using the same signal base station as him?

Doesn't this mean.

"Yes."

Noah’s Ark sent the conclusion directly via text message:

"The murderer you are looking for is on this mountain now."