She Niu's Sixth Son, And His Criminal Police Sister Grievance!

Chapter 84: The Rooftop Is A Good Place (4 More)

The sun is setting and the roof is windy.

Zhang Yang took one step at a time, walking very slowly, and stood on the edge of the rooftop.

Overlooking, the streets below are full of traffic.

With his current eyesight, he can see very far.

If it is the eyesight of a normal person... Zhang Yang slowly looked into the distance from the street below.

Even the eyesight of ordinary people can see very far.

So if you want to see the vehicle, is it the particularly obvious white and blue police car and police lights?

Human vision is at a high position, and the farthest can see the shape of a car at a distance of 500-1000 meters.

Of course, this refers to looking at the car from a height, when there are no obstacles, and it is not in the open air.

However, if it is equipped with a telescope, that is another story.

Zhang Yang retracted his gaze from a main road below, and his mind started working again.

Suppose, when the robbery happened, there were indeed people standing on the roof.

Needless to say, he is not only for sentry, but also to prevent accidents.

If there is no error in the reasoning, it is an accident that the patrol car of the criminal police brigade arrived early.

Even if such an accident was considered by someone, the five robbers completed the bank robbery within eight minutes ahead of schedule.

So it can only be said that he has come to observe the terrain more than once?

In jargon, it's dots!

Thinking of this, Zhang Yang began to look towards the rooftop.

Central air conditioner, signal base station box... Except for these two obvious objects, there are some lightning rods, and there is nothing else in 133...Huh?

Zhang Yang looked towards a corner and walked out step by step.

Then he came to the metal frame that fixed the air conditioner, and slowly lowered his body.

He saw cigarette butts!

After being exposed to wind and rain, the paper garment outside the filter tip of the cigarette butt has already cracked, exposing the cotton core inside.

There are a total of nine cigarette butts, but they can be divided into several degrees according to the state of filter damage.

It can be said that this is not a certain person who smoked nine cigarettes at a time, and the interval and time span are very long.

Moving his gaze, Zhang Yang looked at the metal frame that fixed the air conditioner, and there was a horizontal one.

What catches your eyes?

Zhang Yang's eyes were scanning the dust floating on the metal frame.

Then, the problem was discovered.

On this horizontal frame, there is a spot of floating ash that is visibly thinner.

Zhang Yang stood up, turned around, and then squatted down slowly.

When the butt was about to touch the frame, he paused.

Someone has sat here and smoked... Zhang Yang sneered and stood up.

Not everyone can climb up to the roof of the commercial building in front of us.

The ladder to enter the rooftop is a full three meters above the ground.

Even if you stretch out your arms, you have to lift it close to a meter high to grab the escalator (bcde).

It's just grabbing, and it's still a struggle to climb up the escalator.

People with little strength can't do it.

Who would be a normal person to climb so high and struggle to climb up just to smoke a few cigarettes on the roof?

And judging from the degree of damage of which cigarette butts, there is a high probability that they were left three months ago.

Three months later, no new cigarette butts appeared.

Think of the time when the robbery happened.

The smile on Zhang Yang's face became even colder.

Is it you, the conductor behind the scenes?

"Check the surveillance in the building!" Zhang Yang said.

Not far behind him, Pei Yutao took out his mobile phone.

Before they came to the roof, several surveillance cameras were found in the building.

Downstairs is the bank, upstairs is the business office area, and there is also a securities staff office in this building.

It is precisely because the personnel in this commercial building are relatively mixed, and there are surveillance cameras in the building.

Two hours later, Pei Yutao shook his head at Zhang Yang in the dark, "There is no surveillance anymore. The surveillance in their building is only kept for one month, and the surveillance three months ago is basically the same."

It was already dark, and the wind was a bit chilly, making Zhang Yang's heart a little cold.

A small hand like nephrite jade held his hand, and an elegant noise sounded, "It's okay, this clue is not good, we will continue to look for it."

Zhang Yang came back to his senses, looked at Ye Zhiyao beside him, his eyes lit up again, "The rooftop is a good place, indeed many things can be done!

Ye Zhiyao:???

what do you want to say

Zhang Yang didn't dare to tell Sister Smelly that there would be a lot of idiots climbing to the roof in the middle of the night, using the sky and the ground as beds, facing the wind and waves, and treating this place as a breeding ground for human cubs.

However, let him understand it again.

"I mean, the thread didn't break."

Zhang Yang held his sister's hand, raised his head, and looked up at the black night sky, "You taught me that the criminal police need to open their brains based on clues, think boldly and unconstrainedly, and do a few more cases before reasoning." Conjecture, based on this, integrate the feasible places, overthrow all the unfeasible places, rearrange the reasoning, and then..."

He took Ye Zhiyao's hand and walked step by step to the metal frame that fixed the air conditioner.

The little policewoman looks puzzled, what is Brother Xia going to do?

"Your words reminded me of a funny thing." Zhang Yang grinned.

Ye Zhiyao:???

What did I say?

"You look here."

Zhang Yang raised his other hand and pointed to the metal horizontal bar in front of him that someone seemed to have sat on, "If you want to sit on it, what posture will you use?"

Sit on it... Ye Zhiyao frowned, glanced at the horizontal bar, "Sit on it directly."

"wrong."

Zhang Yang shook his head, "This horizontal bar is only about five centimeters wide. If a person sits down directly, will it be so stable?"

Ye Zhiyao was silent.

In a squatting state, if you want to sit down, how can the buttocks sit down directly and so accurately.

Unless..... Ye Zhiyao suddenly stared, "You mean.....hand?"

"That's right, bandit!"

Zhang Yang nodded, "Hold it with your hands first, and then sit down, it will be stable."

"But......"

Ye Zhiyao's eyes became a little dim again, "After such a long time, even if someone touched it with the palm of their hand, there is too much dust, and it is difficult to see the fingerprint."

"Ha ha....……"

Zhang Yang laughed, "There is no floating ash!"

"Uh!"

Ye Zhiyao murmured blankly, "How is it possible?"

"To grab this bar, you need your palms down."

Zhang Yang made a gesture of bending over and grabbing, and continued: "When the palm holds it, the fingers will hold the bottom of the horizontal bar. The bottom is also the place where dust is least likely to fall. If someone holds the bottom , do you think it will leave fingerprints?"

In an instant, Ye Zhiyao's eyes sparkled with splendor.

Of course there will be fingerprints!

But after so long, can it be preserved?

The answer is: yes!

The sweat on the hands is relatively large, and the oily fingerprints will stay on the bearing for a long time.

Without being damaged by the objective environment and man-made, it is usually kept for more than seven days, or even longer.

For example, fingerprints on the mirror, you can keep a set.

Fingerprints on paper can still be revealed chemically after a few years.

Sweat and oily fingerprints will have some kind of reaction with the paint.

It can be kept for at least two or three months.

paint?

The metal frame in front of me was painted.