The two went to the police station.

Fang Mo took Yang Xueqi to the office as soon as possible, took out the surveillance video, and said, "Look at this." ”

Yang Xueqi was slightly stunned, but still took the laptop and looked seriously.

The content in front of the video is no different from what Fang Mo watched for the first time.

But when Xu Mo left the room and came back again, his whole state was very problematic.

I saw that Xu Mo opened the door, and after returning home, he skillfully changed into shoes.

Then he started stroking the shoe cabinet, then walked around the room and looked around.

This looks like a person who has been away from home for a long time, and when he returns home again, he can't help but touch the east and look the west.

Especially when Xu Mo looked at the curtains that were pulled up and had to monitor the probe, he subconsciously frowned, his lips squirmed, and he seemed to say something.

It's a pity that the time is too short to see what he said.

After Xu Mo had turned all the places around, he began to tidy up the room.

Even though the room was tidy, he tidied it up, and it seemed that he had obsessive-compulsive disorder.

After doing this, Xu Mo went to the bathroom.

When he came out again, he had already changed into a set of clothes.

A black sweatshirt with a hood, a black mask, black gloves, and a black backpack.

After coming out of the bathroom, Xu Mo went out again.

Seeing this, Fang Mo pressed the pause button and turned his head to look at Yang Xueqi.

Yang Xueqi knew what Fang Mo wanted to ask, but she didn't rush to give an answer, but asked, "You suspect that he has multiple personalities based on this?" ”

Fang Mo nodded, and then asked, "Is this a multiple personality?" ”

Yang Xueqi put the video back upside down, watched it again, and then slowly shook his head in Fang Mo's expectant eyes and said, "Judging from his behavior alone, he does look like a second personality, but this is all disguised." ”

"What? Disguise? ”

Fang Mo looked at Yang Xueqi in disbelief, and subconsciously said, "How can this be a disguise?" ”

At this moment, he couldn't help but begin to doubt Yang Xueqi's professionalism.

Yang Xueqi said unhurriedly: "Captain Fang has been a police officer for many years, and he should have encountered some criminal suspects who said that they were mentally ill, such as a split personality or something, in order to avoid punishment, what would Captain Fang think of this kind of person?" And what will be done? ”

"If the other party is disguised, we can see it."

"Then on what basis do you judge that the other party is pretending?"

"Of course, it's his speech and demeanor, and all the previous performances."

"What if the other party is well disguised?"

"We'll send them for a psychiatric evaluation, or through a polygraph."

Yang Xueqi nodded.

Mental illness is not so easy to disguise, and most people think that mental patients are the kind of people who shout, talk nonsense, and behave strangely, so when they disguise or imitate, they will disguise according to their own understanding of mental patients.

This may seem like a clever approach, but it's actually stupid.

Most mentally ill people actually know that they are sick, but they don't think it's a disease, and many mentally ill people are just cognitively different from ordinary people, but they have a complete logic of their own.

To put it simply, mentally ill people are sick, but they are not stupid.

Even many mentally ill people are smarter than some normal people.

Therefore, if you want to disguise yourself as mentally ill, you must first construct a clear and meticulous logic that is different from common sense, and then react differently according to this logic.

But no matter how much an ordinary person constructs it, he can't escape his existing cognition.

Therefore, when they deliberately act like a psychopath, it looks very funny and ridiculous, and the average person can see it.

But there are also some people who are smarter, they don't pretend to be mentally ill, they go to construct a second personality.

This kind of person will not shout or anything like the previous people, they will use some small actions, such as talking to themselves, changing their temperament, denying the existence of certain things, and so on.

In this case, the first thing that comes to people's minds is that this guy is sick, and people who know something about psychology will take it for granted that this person has multiple personalities.

However, such a person can be detected as long as they are sent for psychiatric evaluation, or by using a polygraph.

Of course, there are some people who can't be detected, but they are already disguised.

It's just that if you want to do this, you need conditions.

First, they must have a set of behavioral logic and cognition that is different from the subject.

To put it simply, they have to make up a person.

The fictional person must not only be different from the subject, but also have an inextricable connection with the subject.

If you want to do this, you can't do it without a certain IQ.

Second, they must hypnotize themselves into believing that they do have a second personality.

Only then will they be able to pass the polygraph.

But self-hypnosis is not so easy.

What's more, according to medical research, many times, the main personality is unaware of the existence of a second personality, and the second personality does not appear easily.

To be precise, every time the second personality appears, there is a certain pattern and it will not appear without warning.

After all, the second personality is not the main personality after all.

It's just that it's not so easy to escape the law by forging a second personality.

Let's not talk about how to pass the psychiatric evaluation, even if it passes, the police can judge whether the other party has lost his behavioral and cognitive abilities based on his performance when engaging in criminal activities.

In general, people with multiple personalities are not disabled or cognitive, so they will still be sentenced.

After spending so much effort, it still can't change the ending in the end, so what's the point of doing this?

After giving Fang Mo science all this, Yang Xueqi pointed to the video and said: "It is difficult to judge whether a person has a second personality or not, but it can still be seen whether a person is disguising." ”

Hearing this, Fang Mo frowned and asked, "Why did he do this?" ”

Yang Xueqi shrugged and said, "I don't know about this, but I am sure that he must have his own purpose in doing this." ”

Immediately, Yang Xueqi asked how Fang Mo got this video.

Fang Mo naturally didn't hide it, and said everything in detail.

After listening to this, Yang Xueqi also frowned, looked at the video, and then looked at Fang Mo.

Fang Mo was very uncomfortable by Yang Xueqi, and couldn't help asking, "What's wrong?" Why are you looking at me like that? ”

"Captain Fang, I remember you said before, you can't be sure if the person who attacked Xu Mo in the 404 case is Chen Shi, you and Xu Mo both suspect that there is a sixth person at the scene, right?"

Fang Mo nodded.

"Xu Mo has always suspected that someone is spying on him, right?"

Fang Mo nodded again.

"Then I guessed his purpose."