Criminal Psychology

The dynasty moved very fast.

When Zheng Xiaoming's parents walked out of the studio with their son dizzy, the fat man was robbed by a terrible young man running forward.

Lin Chen held down Zheng Xiaoming's parents and said gently: "They may have some problems and need to communicate in private ..."

Xiaoming's parents were at a loss, Lin Chen had to invite the two parents to the lounge and made two cups of tea.

Through the glass window, you can see Wang Chaozheng and Xiaoming face to face, talking with chickens and ducks. The dynasty kept talking, Zheng Xiaoming looked up blankly, a look you did not understand.

When the police officers around saw the two of them, they surrounded them curiously.

"Little dynasty, are you speaking Chinese, why can't I understand a single word?" A police officer joked next to him, "The child is going to be dizzy by you."

The dynasty glared at each other and waved his hand: "You mortals, don't disturb our communication!"

A moment later, a very bizarre scene happened. Comrade Zheng Xiaoming pulled away from the dynasty and sat in an office chair filled with cushions by Comrade Xiao Wang. In the face of Comrade Xiao Wang's computer, he did not hesitate. Then, a large number of pictures of high-rise buildings appeared. Zheng Xiaoming looked at one of the buildings, took a piece of paper, wrote down a series of values, and then very well jumped off the chair, put his hands on his stomach, and looked up at the dynasty again.

"OK?" The dynasty asked.

Xiao Ming nodded.

All the police officers surrounded him, but no one dared to speak.

The dynasty snorted, quickly jumped into the chair and started operating the computer.

Lin Chen nodded to the two adults in the lounge and walked behind the crowd.

Several police officers gave way, Lin Chen stood behind the Dynasty office chair, and the fat man quickly rubbed against his leg.

Lin Chen never understood the computer interface of the dynasty. The young man knocked down a large piece of code, and then looked back at a large group of people around him, panicking, "Why do you all surround me? ! "

"I heard that the killer tied the weapon to a balloon and let it go?" A police officer asked.

"I heard that you are going to retrieve the weapon?" Another police officer asked.

"We are going to watch you pretend," said the third person.

The dynasty "relied" and was sentenced to the scalp: "Speak well, how are you going to find?"

"The most primitive search method is to pull the net across the city. We put the news out, determine the last position of the balloon based on the witness's report, and judge according to the wind direction of the day. Chopping vegetables can always be picked up by the masses or searched by us, it is only a matter of time, right! "

"Crap." Xun Lian was not angry.

"I have a faster method. I can calculate the approximate location of the weapon, and narrow it down to the size of five football fields. If it goes well, we can find the weapon before the dark today!"

"Explain." Xun Conglian said.

"That's it. There is a mathematical model in meteorology that specifically looks for the fall point of a weather balloon gondola after cutting. We can use this model to determine the possible fall point of the murder weapon after the balloon released by the killer explodes at high altitude."

"But how do you determine exactly where the balloon explodes, this possibility is too much, and even has a lot to do with the gas rushed inside the balloon, the weight of the cutter, and the material of the balloon skin." Xing Cong paused and asked; " Are we going to experiment? "

"Boss, you are also the original search method, but the experiment is of course to be done." Wang Chao smiled, "Xiao Ming's mother said that the balloon that the killer gave Xiao Ming was the kind sold in the park, so we will buy some later , Tie a heavy object underneath and release it, so as to find the last possible landing point of the weapon. "Said the young man, passing the value just written by the fat man.

"What the hell?"

"Oh, my brother just figured out the weight under the balloon, which is the range of possible weight of the knife."

Lin Chen looked at the value on the paper: "How did you figure this out?"

"High school physics, I guess, he just got to tell my younger brother after class, and he understands it!"

Lin Chen frowned, looking at the dynasty in disbelief: "Huh?"

The dynasty was embarrassed: "Um ... I just tried to see if he could understand. In fact, there are not many knives that can be hung by three balloons, let alone kill people. They must be light and Sharp, I just asked the Forensics Department, and they have already determined the model of the tool. I just let my brother calculate it according to the physics method. There is a reference. In fact, these weight errors can be ignored at high altitude.

"Jun Xuan Ji?" Lin Chen looked at the fat man on the leg of the Dynasty, very speechless.

Xing Conglian took the paper from the dynasty, ignoring my younger brother who had opened his mouth and closed his mouth. He waved his hand and called the police to arrange a paradise lakeside experiment.

Ural was surrounded by a third behind the dynasty computer.

The dynasty shouted at the back of the departing police officer: "Remember to put gps on it!"

Xing Conglian took the human head back to the computer and continued: "Experiments are possible, but the wind speed will change every day. What else can you do in one go?"

"Boss, here is another search method I want to say." The dynasty said, and he was a little excited. "Boss, you just said, the difficulty of calculating the final landing point lies in the time when the balloon explodes at high altitude, is it possible? There are two cases where one burst and one burst, so the track will be very erratic. So, how can we calculate the erratic balloon flight trajectory? "

Comrade Xiao Wang procrastinated, no one ignored him, he had to increase the volume, and asked himself to answer: "Radar."

"This is impossible." Xun Conglian said, "How can such a small balloon and suffix be detected? The weather balloon can be detected by radar because it is 10-20 times the size of a normal balloon. "

"Have you heard of the airport bird detection radar?" The dynasty asked back.

"Continue." Xun never spoke.

"The radars are all the same. I do n’t know the specific principles. Commonly used moving target radars can detect normal high-speed moving targets while suppressing fixed and useless targets such as buildings, mountains, and clouds. Objects cannot be identified. In order to detect such low-speed flying objects with small reflection cross sections through radar, it is necessary to improve the filtering algorithm. This algorithm is worth more than a billion. "

Xing Conglian glanced at him: "Let your elder brother stand here and listen to your nonsense for ten minutes, so there is no condition to talk."

The dynasty was suddenly suffocated and could only say: "We go to the Aviation Administration and ask for a copy of the radar data after yesterday's incident. I'll filter it again, but the algorithm won't sell!"

The time it took to find the weapon was not too far from what the dynasty estimated. The police wanted to find something. No accident, they could always get it.

Before that, Lin Chen had been sitting in the lounge without saying much and refused to send him to the hospital. He took off his shoes and sat cross-legged on the sofa, watching everyone in the police station busy.

Zheng Xiaoming was sitting next to him doing his homework. The parents of the obese still had to go to work in the afternoon, but because the children themselves were not willing to go back to school to continue their classes, they could only leave people at the police station.

Lin Chen watched the child hold the pencil with his fists, and tried to copy the Chinese characters in the book. In fact, this creature is not terrible to say. The terrible thing is that it still has a strong willpower, which can basically even destroy the earth.

When Xun Lian took time to come in, Lin Chen was touching the child's head and educating him to study well at school.

"I thought you would advise his parents to send the child to work with his classmates." Xun Cong took a cup of warm water and put it in his hands.

"Does Hongjing have such a primary school?" Lin Chen asked. "

"Uh ..." Xun Lian laughed and squeezed to his side, "Would we like to drive one?"

Lin Chen held the cup and smiled.

"You laugh very far, consultant Lin." Xun Conglian said, "It's not like the kind of sweet smile when you see me."

Lin Chen did not answer this joke.

"Since you know that the suspect has let off the weapon, you haven't said much." Xing Conglian finally said.

"No, I just find it hard to say clearly." Lin Chen sipped, "I still think that it is unnecessary."

"Ok?"

"Balloons and flying weapons, too big. Will a savvy killer do that?"

"It's hard to say. It depends on the personality of the killer. He is born with a pervert. He is very excited after killing people, and he can't wait for a striptease." Xing Conglian said.

"Yeah, so I also think it's hard to say clearly." Lin Chen shook his head. "If he is a professional killer, it should be impossible to know that the police will find his lethal weapon. This is purely for him In order to let go of the murder weapon as quickly as possible, I can understand it. But why didn't he tie the last balloon to the murder weapon, but took away and gave it to Xiao Ming, I really can't understand such a mental state. "

"There is a saying that the murderer should quickly release the evidence related to the murder in batches, but it is not reasonable to put it here to explain why he gave Xiaoming a balloon."

Lin Chen really didn't know what to say. When he thought about it, he could only say to Xing Conglian: "I think there must be nothing in this homicide, so I have to find something for me."

"Xing Cong even said seriously: I blame the dynasty for being too capable, and I went back and beat him."

Hearing that Zheng Xiaoming, who had been doing his homework, looked up, looked at Xun Conglian with horror, and moved his **** to the other side of the stool.

This action is so cute, Xun Lian went directly to it, and kissed the child's face.

Zheng Xiaoming and the dynasty are really similar in some respects. He was kissed by Lianlian. He stood up, walked to the tissue box, took a sheet from it, folded it, and began to carefully wipe his side Sentenced to a place where he had been kissed.

Xun Lian was stunned.

Just then, there was a thrilling celebration outside the lounge.

Lin Chen struck a spirit and looked at Xun Conglian.

A police officer rushed in and shouted, "Boss, that black bag was found!"

"So fast?" Xun Lian stood up, very surprised.

"It just happened to be on a lawn in the suburbs. It was particularly conspicuous. Xiao Wang calculated the address, contacted the police there, used a metal detector, and found it in a second."

About forty minutes later, the black plastic bag and the murder weapon wrapped in it were sent to Hongjing Interpol, with ropes and the wreckage after the balloon burst.

Because the process of finding the knives was too wonderful, when the physical evidence was delivered, most of the forensic departments and forensics came around.

The black plastic bag was carefully dismantled layer by layer, finally revealing the silver-white, **** blade.

Everyone present was feeling relieved with wonder.

Xing Lianlian stepped back from the stage and said, "Let's start work, first confirm that this knife is the weapon used by the suspect."

A blood sample contaminated from the blade was extracted, and police officers in the forensics department began to check the fingerprints in plastic bags and scotch tape wrapped around the bags.

When the test results came out, Lin Chen and Xun Lianzheng took the dynasty Zheng Xiaoming to eat in the cafeteria.

Zheng Xiaoming preferred the braised chicken legs cooked by the chef in the cafeteria of the police station. In order to show the good virtues of his brothers and brothers, the dynasty took 30 yuan from his own small vault and bought five chicken legs. .

Lin Chen looked at Zheng Xiaoming, who had eaten three chicken legs and was ready to eat the fourth one. He always felt that this was not good, so he moved the vegetable basin to a place where Xiao Ming couldn't reach, which was in front of Xing Conglian.

Xun glanced at the connected fingerprint report and asked with some surprise: "Is the fingerprint on the tape the same as the fingerprint on the notebook I brought back from the Stancon office?"

"Yes." The police officer nodded and handed the second piece of paper to Xing Conglian: "Then we analyzed the blood sample on the knife and confirmed that it belongs to the victim Stan Kang."

Xun Cong nodded his head, sighed, raised his chopsticks to clamp the chicken leg into his bowl.

Suddenly, the police officer continued: "At the same time, another set of DNA samples that did not belong to the victim Stancome was found on the weapon, and a target matching the second group of DNA samples was found in Curry."

Lin Chen suddenly looked up, and Xun Conglian's chopsticks stopped in the air.

"Who is it?"

The policeman handed the last piece of paper in his hand and said, "Call Duan Wanshan."