City: The opening scene of the crime scene

Following the red line in the system deduction screen, Li Fan followed downstairs.

When going downstairs, Li Fan was worried that the caller was too far away and would delay the time of solving the case, so he asked:"Can the system estimate the location of the source of the electromagnetic wave signal?"

"Calculating for host……"

"The calculation is successful, the straight-line distance between the source and the host is 200 meters, and the host needs to walk 340 meters to get there."

This distance is not too far for Li Fan, so he did not plan to take a special car. He quickened his pace and moved along the direction indicated by the red line in the picture.

A few minutes later, Li Fan came to a street outside the Xincheng Community and walked to a fragrant tree. Beside the camphor tree

"This is it."

The place where the electromagnetic wave signal was emitted was under the camphor tree in front of him.

It was from this place that the electromagnetic wave was emitted by the prisoner, which opened Yang Bin's phone call.

Of course, there is no prisoner here now, and the system's clues are locked. It was a clue when committing the crime.

Li Fan jumped to the moment when Yang Bin received the call, and saw an ordinary-looking man standing under the camphor tree. Li Fan was holding a backpack and was squatting on the ground typing and chatting with others. He looked like he was waiting for someone. Li Fan took a look at the man's chat and saw that he was just bragging about driving with a few classmates in the class group.

, there was nothing special about it.

However, Li Fan was sure that the electromagnetic wave signal coming from the phone came from this man.

After observing the man for a few times, Li Fan noticed the backpack behind the man.

"System, deducing the see-through backpack."

Under the fluoroscopy, Li Fan saw clearly what was in the man's backpack.

There was an electronic device that looked like a router, but it was larger than the router.

The words written on the electronic device were all in foreign languages, not English. It looked a bit like Latin.

He didn't know what it was, but he could guess that this electronic tool was used to call Yang Bin.

Li Fan was not familiar with electronic products, so he had to ask the system:"System, do you know what this is?" Toy?"

The system quickly gave the answer:"Reporting host, this is a small pseudo base station"

"Pseudo base station?"

Hearing this word, Li Fan suddenly remembered an article he had read before.

Someone used a pseudo base station to forge and simulate the operator's signal in a specific area, and could also simulate any number and send it to people nearby. Fraudulent text messages.

If you have the frequency band of a specific mobile phone number and capture its data, it is possible to dial the phone number, thereby achieving the effect of calling the other party from any number.

However, it can be done to this extent. , are relatively large, and are easily discovered by professionals in the communications industry.

If it is really a fake base station, then the case investigation team should have investigated it.

Of course, there is another possibility, and that is the fake base station in the man’s backpack. It is a pseudo-base station with higher technical means and is a new technology.

The machine in the backpack is written in Ding language. Li Fan feels that this thing may be a good thing that men illegally obtained from abroad. It is better than what was discovered in China in the past few years. The pseudo base station technology is more advanced.

In order to verify his idea, Li Fan asked:"System, are you sure that the machine in the man's backpack is a pseudo base station?

The system gave Li Fan a positive reply:"Reporting to the host, the system is 100% sure it is a pseudo base station.""

After receiving a positive reply from the system, Li Fan felt relieved.

As long as he knew it was a pseudo base station, he did not need to worry about its technical problems. Anyway, he was not a relevant technical person. When solving the case, he directly asked the people from the task force to find professionals. At this point, Li Fan understood the origin of the death call.

The perpetrator was walking around Yang Bin's house and had a pseudo base station in his backpack that could simulate the signal of any number. , in this case, the pseudo base station first simulated the phone number 1748, then captured the frequency band of Yang Bin's mobile phone number, and then dialed the number, so Yang Bin received the call.

Because the pseudo base station was only a temporary one. site, so the number found by the operator was empty.

However, for Yang Bin, receiving a death call did not affect his safety.

Li Fan couldn't understand why the perpetrator had to make a death call before committing the crime. A phone call to scare the other party?

Doesn't this give the other party a warning?

Moreover, calling the death call will alert the investigation team.

It seems that the perpetrator's motive still needs to be understood, otherwise there will be a gap between the three death call cases. The reason was unclear.

Then, Li Fan continued to speed up the deduction, trying to see what the man would do next. However, Li Fan did nothing during this deduction. During the process , he tracked the other party and found his home address.

The man's home was not far from here, only half a kilometer away. After confirming the residence of the man who made the death call, Li Fan felt more at ease during the deduction process.

, he also saw the man in reality carrying a bag of vegetables walking upstairs. It seemed that the man had not left here.

Then, Li Fan returned to Yang Bin's residence again and began to look for Yang Bin. The cause of death.

Yang Bin died of poisoning. The time of death was the day after receiving the death call.

Li Fan followed Yang Bin in the deduction screen as he walked, from eating at home to playing in a nearby park. I watched all the way until the early morning of the next day.

Yang Bin died in a dream. His whole body was twitching when he died, but he did not wake up. He may have lost consciousness and was in a coma during the death process.

Fan didn't find any clues about Yang Bin's poisoning.

This made Li Fan wipe his hands.

It was too difficult to find clues in this case.

He could only see what happened to Yang Bin. He was dead, but he couldn't see how the prisoner poisoned him.

If he hadn't found the person who made the death call, he would have found nothing.

The clue locking skill was used because he felt that if he kept using this skill, his own ability to extract clues from the case might be weakened.

But now he found that this case could only be solved using clue locking, otherwise. , it's not that it can't be cracked, but it's very, very difficult, and it may not be 100% successful.

Thinking of this, Li Fan was a little scared. Fortunately, he got the clue lock reward, otherwise it would be impossible to crack the case. It's unknown.

He even feels that the system has the ability to predict what problems the host will encounter next, and then allow the host to extract corresponding rewards.

Looking at the deduction screen with no clues, Li Fan had no choice but to ask the system:"System, can you find any clues related to Yang Bin's poisoning?"

"Report to the host, clue lock is looking for you……"

"Report to the host that the clue has been found. The clue is in the takeaway burger Yang Bin ate!"

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