Criminal Psychology

"How do you get it? Is it a drag-net investigation?" Jiang Chao sighed, "To be honest, I think there is not enough time for investigation and investigation."

"Yeah, so we need to find some people to come out and talk to."

"what?"

"If we are sure that there will be another live broadcast, that is to say, there are still people who may commit crimes in this school or in the whole city, we can use some methods to find these people and talk about them."

"The question is, do you have any psychological method to find someone quickly?"

"To be precise, it's math."

Lin Chen took out three pieces of paper from his pocket, which he had been carrying with him all day, and now it seemed that he was glad that he didn't throw away these papers because of trouble.

"Borrow the dynasty to use it." He said to Xing Conglian.

"Why are you so polite, as long as it doesn't kill you, you can use it anyway." Xing Conglian replied with a smile.

The teenager sitting on the side raised his head from the screen, with a pen in his mouth, obviously still trying to figure out how to phrase it so as to catch those perverts: "Boss, you know that I'm easy to betray you like this?"

Lin Chen spread the three pieces of paper on the table and said: "In fact, through the results of MMPI, we found that Wang Shishi, Xu Haozhen, and Jiang Liu all have similar personality characteristics, so we can use this characteristic in turn to screen out possible groups of people. .”

"Find out the people who may participate in the next live broadcast of death?" Wang Chao leaned back on the table in the next second, "There are [-] teachers and students in Guangyongchuan University. Want to find three people who will participate in the next live broadcast? Ah Chen Don't tell me, this is really a needle in a haystack."

"You mean, first screen out people with social introversion scores greater than or equal to 70?"

Lin Chen nodded. After what happened just now, he was no longer surprised that Xing Conglian remembered the key words and scoring criteria.

He glanced at Wang Chao, and the boy consciously spat out the signature pen in his mouth, and didn't forget to wipe the bitten place with his T-shirt.

After taking the pen, he drew a big circle on the paper and explained: "Assume this is a group of people with high scores in social introversion..." Afterwards, he drew a small circle that intersects with it, " These are the possible perpetrators." He said as he blacked out the intersection of the two circles, "This is the potential group of people we may find."

"I got it! This is asking me to hit a library first, get out the data of this test, and then screen out the students who scored above 70 in this test. How many people are there?"

"What library?" Xing Conglian knocked on Dynasty, "We can transfer data through due process."

"A score of 70 is about two standard deviations from the mean, so it is conservatively estimated that there will be 4% of the abnormal population." Lin Chen continued to answer.

"Then even if we only screen Yongchuan University, there will be 1200 people!" Wang Chao exclaimed.

"Is there any other way to narrow the scope?" Xing Conglian asked.

"Yes." Lin Chen replied simply, "Take another personality test."

The suicides in this case all showed major changes in their personalities, so the students whose scores in the second personality test have changed significantly are highly suspicious.

"I understand." Xing Conglian said.

"However, there is still a problem." Lin Chen looked at Xing Conglian, "Suppose we conduct a personality test on students with great fanfare, won't we startle the snake?"

"It's not a big problem. Now that there is such a serious suicide incident in the school, isn't it normal to check the students' mental health problems?" Hearing Lin Chen's worry, Xing Conglian continued with a smile, "And, wait for you Is it not justice enough to interview suspicious students who have really been identified as an excuse?"

Xing Conglian's words made Lin Chen a little speechless: "You really are..."

"What is it?"

Lin Chen shook his head, expressing helplessness.

"The treacherous, treacherous, treacherous and cunning are especially shameless!" Comrade Chao Chao replied with incomparable justice.

Xing Conglian didn't seem to care about these comments, he frowned slightly, and asked Wang Chao: "How long will it take you to complete the preliminary screening?"

"This one is fast."

"How long does it take for the second strategy?" He asked Lin Chen again.

"The test time only takes about one hour, but the process from organizing manpower, arranging the test location to notifying students to take the test will be relatively long, and the student base is huge..."

Xing Conglian heard the words and glanced at the time: "It's 16:37 now."

"Yeah, it's almost time to get off work. Even if you notify the counselor now and arrange the test, the first batch of student tests will start around 19:00."

"Do you have an estimate, which department and grade are most likely to appear in the students we are looking for?"

"Actually, there is no significant difference in the scores of students from different departments, but the proportion of students in the Department of Psychology who are mentally unhealthy is relatively high..."

Xing Conglian couldn't help laughing: "Is this self-satisfaction?"

Lin Chen picked the corner of his mouth and continued: "According to our school's data, there are also students from the School of Medicine and School of Chemistry...

"Approximately how many students are involved?"

"Report to the boss, there are 3158 people in total." Comrade Chao Chao answered quickly.

"Meaning, the test can't be done today anyway, right?"

"Even if 20 classrooms are opened at the same time and 800 students take the test, it will take 5 hours to complete."

"It will be tomorrow morning at the earliest."

But even tomorrow morning, 20 hours have passed.

Xing Conglian nodded, and continued to ask: "Can you narrow down the scope?"

"From the perspective of grades, freshmen have just taken the entrance test, so there is no need to take another test. Many senior students have started internships and are no longer on campus. They are directly excluded. Therefore, it is good to directly select sophomores and juniors."

As soon as the two of them finished speaking, they heard Wang Chao neatly hit the Enter key.

"Yoooo has a total of 1342 people!"

It is indeed very pleasant to cooperate with efficient partners: "I need to trouble you to pick out the sophomores and juniors of the Department of Psychology, School of Medicine, and School of Chemistry, and then pull a list for me." Lin Chen said.

"Small idea." Hearing the words, the young man tapped the keyboard a few times. He stared at the generated data, and said to Lin Chen, "Don't tell me, Chen, your psychology department is really special."

"That's right, I've always been weird too." Lin Chen shrugged his shoulders in a rare way, and said, "Send me the list of these people, their resumes, and the test results."

"already sent."

In short, Lin Chen probably understood why Xing Conglian had to bring Wang Chao with him, it was too easy to use.

After the boy finished speaking, he took out a tablet computer from his backpack and handed it to him: "Use this to read."

"If we have this list in hand, can't we cross-check the circles of friends of the six deceased in this case to see if there is any overlap?" Jiang Chao asked suddenly.

"Yes, yes." Wang Chaocong took out a candy and threw it into his mouth, "Why do you find someone to do it, I still have a lot of things to do."

Even though the dynasty has been relaxed and laid-back from beginning to end, the investigation has been very stressful until now.

Large-scale crowd screening and urgent time are almost naturally contradictory.

He continued to connect to the dark network, and pressed the refresh button a few times irritably, as if he could get a response from someone on the other end of the network.

"If Captain Jiang has a list, can you do a comparative analysis for him?" Lin Chen pressed the boy's hand, his tone gentle.

"It takes a long time to compare, and there is no response from there, so I have to keep an eye on the replies."

It was rare for the boy to reject him.

Probably because my abilities are almost useless in this dark world, so I am more eager to play some role and defeat something.

As if he had seen through the boy's mind, Lin Chen shook his head and said, "You should do more important things."

"Have you heard that, let Ren Xian watch the reward later, at least you taught it, and the level is not too bad." Xing Conglian was not too tough, "However, if within half an hour, we haven't Once you get a response, you need to take some more extreme measures."

"What do you want to do?" Lin Chen asked.

"Our current fishing net is too small..." Xing Conglian looked at Lin Chen, "The main reason is that you inspired us to find a needle in a haystack. Assuming that the murderer behind the scenes is using live broadcasts to make money, then he can't be too repulsive to newcomers. There are also many underground forums on the Internet, we can write some topic posts, um..."

"You want to say, let me imitate the tone of a psychopath, write a theme post, distribute it on various websites, and widen the fishing net?" Lin Chen keenly noticed the trap.

"You are more professional." Xing Conglian was a little embarrassed, so he took the initiative to express his opinion, "I can be responsible for the translation."

Although a little speechless, I have to say that Xing Conglian's opinion is still very reliable. He just wanted to answer, but he heard the other party say: "Does Consultant Lin know where the toilet in the office building is, please take me there?"

Xing Conglian is probably the type who finds someone to talk to alone and considers the moods of other people in the room in detail.

Lin Chen went out with him, as expected, the captain of the criminal police didn't intend to solve the physical problem at all, he just found a window, opened half the window, and then lit a cigarette.

"What's up with him?"

Lin Chen was a little surprised. He didn't expect Xing Conglian to call him out to ask about the psychological state of the dynasty.

"He must be nervous."

"Are you nervous?"

The question changed too quickly, and Lin Chen couldn't react.

"not yet."

Pale smoke rose up, Lin Chen was a little uncomfortable being stared at by him.

"No matter what, I hope you don't feel too much pressure. If you have any questions, you can tell me." Finally, Xing Conglian spoke.

At that moment, Lin Chen suddenly understood Xing Conglian's intentions, he almost shook his head helplessly, Xing Conglian really understood.

From the beginning to the end, Xing Conglian did not ignore the most critical issue. He knew that Zheng Dongdong had a grudge against him, he also knew about Steward Chen, and he could properly use these two people to set up a huge trap. Everything is too familiar.

"If you really want to know, you can buy me a drink after this case is over."

Lin Chen raised his head, looked into Xing Conglian's eyes, and said this.