Profiler 2: Criminal Investigation Brigade

Jiao Yang said patiently: "It's okay, you should remember it carefully. Or, if you think of something later, you can also ask the guards to call me. By the way..."

Jiao Yang looked at him, and tentatively said: "We have found the model airplane that Tang Zhe disappeared that day. The propeller blades were stained with blood. We suspect that Tang Zhe was killed by cutting his neck off by his own model airplane..."

Gu Yuan showed a surprised expression and said: "Ah? How could such a thing happen?!"

Jiao Yang said: "So, we also feel very strange. Do you think it was Tang Zhe who made a mistake in the operation or his plane lost control and hurt people?"

"There will be no operational mistakes. Tang Zhe's technique is very good, so it's not so outrageous."

Gu Yuan first said the same reason as Li Guoliang, and then said: "There is no way to say that the plane is out of control. There are many reasons that can cause the model aircraft to lose control. I am not sure about it."

Next, Jiao Yang went to see Liu Xiaonian again, "We have found your model airplane, which proves that it has nothing to do with Tang Zhe's death. Please recall carefully, how did your model airplane lose control on the morning of the incident? "

Liu Xiaonian recalled: "It was operated well like this, but when the screen suddenly went black, it lost control."

Jiao Yang said: "Then have you ever thought about why this happened?"

"Officer, I still don't understand how the disappearance of my model plane is related to Tang Zhe's death."

Liu Xiaonian said: "However, you said that it is very common for model airplanes to lose control. It is a relatively delicate thing, and it all receives electronic signals for remote control. If there is relatively strong electromagnetic signal interference around, then remote control is actually quite easy. Malfunctioning. For example, there are many people coming, frequent use of mobile phones, or a large plane passing by, which may cause this situation.”

Jiao Yang looked at Liu Xiaonian carefully and said, "Is there any possibility of human interference?"

Liu Xiaonian scratched his head and said: "It's also very simple. Don't say that our small model airplanes are real large drones. Using a special drone signal jammer or a portable jammer can make them malfunction. This is not true. What complicated technology."

That's how it turned out, Jiao Yang finally sorted out his thoughts gradually, and thought of something.

Jiao Yang finally called Wei Ruxin to the inquiry room.

Wei Ruxin was nervous and flustered as always, "Captain Jiao, I really didn't do anything, when can I leave?!"

"I'm going to tell you something."

Jiao Yang looked at Wei Ruxin carefully, and explained the cause of Tang Zhe's death.

"Tang Zhe..."

Wei Ruxin trembled unconsciously, folded his hands on his chest and said, "The neck was cut off, so how painful it must be when he dies..."

Jiao Yang watched Wei Ruxin's eyelashes flutter, and tears rolled down from the corners of her eyes.

Looking at the entanglement, sadness, and pain on her face, it really doesn't look fake.Jiao Yang thought for a while, and then asked: "Miss Wei, forgive me, are you dating Tang Zhe?"

Wei Ruxin shook his head slowly, "He is indeed pursuing me, but we haven't started yet. I haven't agreed to be with him yet. I grew up in a single-parent family, and I didn't have a father since I was a child. I have always been uneasy about marriage. Trust. I have a good impression of Tang Zhe, but I still don't dare to start an intimate relationship with someone..."

The answer was unexpected. Jiao Yang remembered what he told Gu Yuan about the phone call just now, and asked subconsciously: "Then did you call your mother to explain the situation? Don't let the old man worry about you."

"No." Wei Ruxin said with a wry smile, "Wouldn't it be more worrying to let her know that I was locked up in a detention center for murder?"

"That's true, but that should be said, too."

Jiao Yang said: "Otherwise, wouldn't your mother have to look for you everywhere? Maybe she was so anxious that she called the police. How about this, how about I help you say hello to the old man..."

"Need not!"

Wei Ruxin screamed: "It's really unnecessary! I don't want her to know that I'm in jail now!"

It was the first time Jiao Yang saw Wei Ruxin's expression was stern, gnashing his teeth.He couldn't help being stunned for a moment and said: "You don't have to worry so much, we will find out the truth and return your innocence."

Jiao Yang came out of the inquiry room, checked the register, and found that Wei Ruxin hadn't contacted anyone since he entered the detention center.

Would a girl who grew up dependent on her mother be so cruel to make her worry?Jiao Yang felt that the relationship between their mother and daughter didn't seem to be what Wei Ruxin said.

Jiao Yang returned to the bureau and inquired about Wei Ruxin's life experience.It was discovered that her mother, Wang Yeping, had retired. Wei Ruxin's father was an ordinary worker. Her parents divorced when she was very young, and she has been living with her mother, Wang Yeping.

Of course, some children in single-parent families are more rebellious, and their relationship with their parents is not good.Maybe Wei Ruxin didn't want to blame her mother in front of outsiders, this is also normal.

"Team Jiao!"

Mo Ke walked up to him and said, "The team has discovered some new evidence. We have been around the crime scene, collecting clues with rewards. This morning, a black taxi came over. It is the old scooter. He said At that time, he sent Wei Ruxin to the scene of the crime. Then, he sent Wei Ruxin to the place, and when he drove back, he saw the other three men!"

"Okay, take me to have a look!"

Jiao Yang carefully checked the statement, and asked again, this old man who drives a motor vehicle.After asking, he couldn't help but frowned.

Today's interrogation at the detention center was the same. Gradually, all the spearheads were pointed at Wei Ruxin.

However, he still hasn't figured out what Wei Ruxin's motive for killing is.

So, Jiao Yang asked Mo Ke and Zhou Ying to go to Tang Zhe's house to check if there were any clues, and then check again, the remains left by Tang Zhe at the crime scene.

The task force found a notebook at Tang Zhe's home, which was full of Tang Zhe's records. The whole process between him and Wei Ruxin, from the recognition and familiarity, to his attraction to Wei Ruxin, to conflicts and entanglements.

Zhou Ying also found a recording in Tang Zhe's cell phone.It was full of them, and Tang Zhe told his deep affection for Wei Ruxin.

And Tang Zhe also found a branded bracelet in the backpack thrown at the scene of the crime.

Taken together, Jiao Yang felt that on the day of the incident, Tang Zhe might have prepared to confess his love to Wei Ruxin.

So what happened that morning?

According to the information provided by Liu Xiaonian, Jiao Yang went to consult Chen Ming, a famous local pilot in Shencheng, "Mr. Chen, do you think it is possible to use some signal jamming equipment to control other people's model airplanes?"

Chen Ming said with a smile: "The remote control of the model aircraft uses radio waves to transmit instructions and control the movements of the model aircraft. To realize your request, it is theoretically possible. First, stop the model aircraft from receiving the original remote control signal. Second, use a new signal to replace the original remote control signal. Original signal, send command, control model aircraft.

The first point is that during the propagation of FM radio waves, there is a characteristic called radio suppression, that is, high-power FM signals can completely interrupt communication with low-power signals of the same frequency.According to this principle, use a power amplifier to increase the transmission power of the remote control, suppress the remote control signal of the same frequency, and it will be done.

The second point is that in the past, the traditional remote control signal of model aircraft was called PPM code. This remote control is a universal format that cannot be encrypted. As long as it is sent according to the standard, it can control other model aircraft.However, the current model airplanes generally use 2.4G remote controllers..."

Jiao Yang said: "Is this new 2.4G remote control more anti-interference?"

"That's right, you guessed it right!" Chen Ming said with a smile: "The 2.4G remote control has basically eliminated the PPM code and turned to digital transmission in an all-round way. That is to say, for the current 2.4G remote control, you can use a high-power broadband signal source to interfere The remote control signal, but it is basically impossible to control it like before."

"I understand."

Jiao Yang got up and shook Chen Ming's hand and said, "Thank you, Teacher Chen!"

Therefore, the murderer could only use a signal jammer to cause Liu Xiaonian's model airplane to go out of control and disappear, to frame Liu Xiaonian, but he could not really use Liu Xiaonian's plane to kill people.Therefore, he/she tricked the remote control and killed Tang Zhe with Tang Zhe's plane...

"Team Jiao."

As soon as Jiao Yang returned to the police station, Tao Xiaoyu walked into the big office, knocked on the door and said, "I found something, and I want to tell you something."

Seeing Tao Xiaoyu's solemn expression, Jiao Yang nodded and said, "Come to my office and talk."

Tao Xiaoyu came in and sat down, and put the two test reports on Jiao Yang's desk.

Jiao Yang knew all about the detection and analysis above, but he didn't quite understand what he meant...

He quickly turned to the last page of the two reports, and saw that it was clearly written that he suspected that Tang Zhe and Wei Ruxin were half-siblings born to a biological father.

Jiao Yang couldn't help being taken aback, "How did you find out?!"

Tao Xiaoyu said: "After Tang Zhe's own model aircraft was found, because of his blood on it, it can basically be confirmed as the murder weapon. Therefore, in order to compare who is the murderer, we collected the DNA of the four suspects at the same time. The sample, I want to see if I can find traces of other people on the plane.

I had nothing to do, I looked through the reports of several people, and suddenly found that the DNA information of Wei Ruxin and Tang Zhe had multiple points of agreement.I feel a little unusual, so I want to verify it again.With the current technology, it is also possible to detect half-brothers and sisters.

For example, the method of paternity testing between brothers is to use the genetic loci on the Y chromosomes of the two brothers.Because the Y chromosome can only be inherited from the father.In the same way, the paternal relationship can be identified by detecting the Y chromosome.

The paternity test between sisters is to do the mitochondrial DNA of the two sisters.Because mitochondrial DNA is inherited from the mother's egg cell, the mitochondrial DNA of siblings is identical.

However, the test was complicated by the fact that the two men were not identical in gender.I need more data comparisons, for example, the DNA information of Wei Ruxin and Tang Zhe's parents. "

"Test!" Jiao Yang shouted, "Try to find their respective parents, and test them all!"