Human witnesses, physical evidence, confessions.

There are three elements of a verdict.

It is impossible to make a confession, so you can only start from human and physical evidence.

Study, he can only study now, from the traces of criminal investigation to criminal psychology, he bought a lot of books, from understanding criminal investigation to understanding crime, he only used two months of events, it was the obsession in his heart that drove him to do so.

Conviction without confession, and in all cases, the verdict must be based on evidence, investigation and research, and confessions should not be easily believed. Where there is no defendant's confession, or where the defendant's confession is different from the actual situation, and the evidence is conclusive and sufficient, the defendant may be found guilty and given a punishment.

Witnesses.

As a witness, he does not need to witness the entire process of the case, but only needs to witness the suspect entering and leaving the crime site or buying props to commit the crime.

Human evidence is one of the pieces of evidence that reconstructs the entire case.

Of course, he himself can be used as a witness in the case he planned.

He has no direct stake in the people involved in the case and could theoretically be a legitimate witness.

But he can't do that, he can't "implicate" himself in this case.

If there is direct evidence of the crime, the witness may only be an unnecessary condition, but he thought that the person responsible for solving the case should be Qiao Chuan of the Sancao City Criminal Police Team.

If someone testifies to this favorable evidence, I believe that Qiao Chuan's speed of "solving the case" will be accelerated.

He needs to make a witness.

Li Li's Weibo is very popular, especially after experiencing that incident half a year ago. Li Li's vanity has also become stronger, she took this opportunity to start an online video, her perfect figure and beautiful face really made her popular on the Internet.

The Internet is Li Li's daily necessities, and the computer is also her necessity, so she can make use of this, and if she successfully uses this, not only will there be human evidence, but also physical evidence.

Site surveys.

When the case occurred, the criminal police would conduct an appraisal of the door lock of Li Li's residence to determine whether it was manually unlocked or technically unlocked.

What would it be like if he knocked on Li Li's door directly, he shook his head when he thought of this, that is, Li Li hung her photo directly on Weibo, Li Li must still remember herself, and Li Li will definitely not open the door for herself at that time, and it will arouse her suspicions, and even tell Zhao Zhaomin.

But what if you put on that old man mask yourself?

No, who will open the door to an old cleaner who is not unfamiliar, if he doesn't open the door, his identity may be exposed.

Even if he learns technical unlocking, the criminal police will find that it is technical unlocking after investigation, which will reduce some of Zhao Zhaomin's suspicions.

In order to be able to point all the evidence to Zhao Zhaomin, he must follow Zhao Zhaomin's trajectory to commit the crime, and the place where he committed the crime can only be Li Li's room.

All he needed to do now was get the key to Li Li's room.

Zhao Zhaomin's character is cautious, and he is notoriously afraid of his wife, it is hard to imagine that Zhao Zhaomin would put the key to Li Li's room on himself.

If he did that, if someone else found out, Zhao Zhaomin definitely didn't want such a result.

He had followed Zhao Zhaomin many times, and when he first started tracking, he found that Zhao Zhaomin had parked his car in a hotel in Daoyuan City, and then never saw Zhao Zhaomin's vehicle come out of it.

Until one time, he found out that Zhao Zhaomin actually changed a car to go to Sancao City, which made him more convinced of Zhao Zhaomin's caution.

Since Zhao Zhaomin didn't put Li Li's key on his body, he either went to Li Li's residence and knocked on the door, and then Li Li helped him open the door, or he hid the key somewhere.

Is it in that car?

He needed to rule it out.

He checked under the mat in front of the door of Li Li's house, and found no key under it, and then he saw the fire hydrant.

The switch button on the top of the hydrant casing is clean, but the cover on the outside is dirty, which shows that the building's cleaners don't wipe it down often.

As an object that is not used often, it is not normal that the switch button on it is clean.

Sure enough, he found the key inside the fire hydrant.

The key to Li Li's room.

Behavioral logic.

One of the most branches of criminal investigation, he didn't have a deep study of it until Qiao Chuan.

Even if there are human and physical evidence, if the criminal behavior is not logical, Qiao Chuan will have deep doubts about this case.

The current relationship between Zhao Zhaomin and Li Li will not allow Zhao Zhaomin to kill Li Li, and if there is no other fuse, Zhao Zhaomin's behavior of "killing" Li Li does not conform to the logic of behavior.

He wants to create a fuse, and this fuse is Zhao Zhaomin's wife.

He knew in his investigation of Zhao Zhaomin that Zhao Zhaomin's wife had a very strong background, which is why Zhao Zhaomin was willing to marry a woman five or six years older than him, and Zhao Zhaomin's wife looked fierce and vicious.

If Zhao Zhaomin's wife can be used, then maybe this will become the fuse for Zhao Zhaomin to kill Li Li.

The logic of the behavior is true.

And Zhao Zhaomin has a fatal heel.

It's his profession.

His profession led to his being too strong in counter-reconnaissance skills, changing cars from him in that hotel, and not taking the elevator from him to and from Li Li's residence.

He could basically guess that this was done by Zhao Zhaomin in order to avoid his wife's tracking.

All of this he can use.

But there was a difficulty that stuck him.

He needs to use Zhao Zhaomin's shoe prints, but if he and Zhao Zhaomin wear different shoes that day, walking on the walking ladder, two different footprints will be formed from the basement to the first floor, and they (the criminal police) will definitely investigate the two footprints.

If you wear the same shoes as Zhao Zhaomin, you will have two sets of the same footprints, what makes Zhao Zhaomin go up and down the stairs twice?

If the criminal police are investigating the monitoring of entering and leaving the community, according to Qiao Chuan's reconnaissance ability, they will definitely find out the number of times Zhao Zhaomin enters and leaves the community, and the number of times he goes up and down the stairs should correspond to this.

How to deal with it?

He thought of a solution.