"No," Mizumatsu said with disrespect. Now the people present are the most suspicious. Letting him leave is not letting him clear the evidence. "Now you are one of the suspects. If you want to leave, you must go through a body search and have a police officer with you. I hope you can understand."

"Uh... there's no need to worry about it, it's not a big deal." The president sat down awkwardly, clearly feeling guilty in Shui Mizuki's eyes.

After talking for a while, Fujiwara Sakagi came in again, holding a stack of reports in his hand, and handed them over to Mizumatsu.

Mizumatsu turned over. When the Forensic Department investigated the monitor on the roof of the office building, it was found that the monitor could be swung its head, but the power of the shaft was too high. A deep cut was found on the edge of the roof. The extended cut was found to be roughly connected to the monitor and the I-shaped steel drag mark on the abandoned building opposite. Along with the report, there were photos of the roof traces and the monitor, as well as some data on distance and weight.

What is interesting is that a harmonica was found at the death scene. After being identified as the deceased, I thought it had fallen out of the deceased. But later I found that there was no fingerprint on the harmonica and there were no signs of the harmonica falling on the surrounding ground. It was speculated that the murderer deliberately placed it under the I-shaped steel for the victim to pick it up.

Mizumatsu turned the report over, took a pen and wrote and painted on the back of the blank space, and drew a sketch of the two-floor roof, connecting a line between the monitor and the I-shaped steel. Assuming that the monitor swing head was used to pull the I-shaped steel, the tension force applied to the pulling wire and the power required for the monitor can be roughly calculated.

But as he calculated, Mizumatsu gave up and threw half of the straw paper into Fujiwara Sakagi to let him continue to calculate. Mizumatsu and Mikako Sato went out to have a small meeting with their colleagues waiting in the corridor.

"What should I do if the police department is in a bottleneck now?" Chiho Kazuki asked. I have to say that after the promotion of Memu police department, Mizumaki's status has been greatly improved. His subordinates did not ask the police department, Mizumaki's position was sought. Instead, they asked the police department for comments.

Shui Jianyue pondered for a while and said, "Come on, let's have a live teaching class."

"Today I will take this opportunity to talk about the presumption method. The presumption method is used in the current situation where there is no clear directional evidence but few suspects."

"The first step is to guess a murderer. I personally think the president of this case is the most suspicious. Let's assume that he is the murderer first. Do you have any objection?"

"No..." the surrounding police officer replied.

"Suppose he is the murderer, what are the techniques he can use? Sakagi, have the data calculated?"

"Report to the police department to make up for it. After the data is calculated, the monitor can pull the I-shaped steel!"

"Okay, then I guess he used the monitor to swing, pull the I-shaped steel down and smash the dead."

"The next step is the second step, speculating action. We found a harmonica without fingerprints at the scene, so I guess he stole the deceased's harmonica first. In order to avoid leaving fingerprints, he wiped it over and placed it on the ground to attract the attention of the deceased. When the deceased picked up the harmonica, he used a monitor to pull the I-shaped steel down."

"The third step is to prove it. If you want to implement this technique, it will leave traces, such as marks on the edge of the roof. At the same time, when you look at this photo, there is a bump at the bottom of the monitor that was obviously a functionless bump that was later welded, and there are traces of being tied up by thin lines and being pulled vigorously. This can basically confirm the validity of this technique and speculate that it is reasonable."

"The fourth step is to find possible evidence. Continue to sort out his next action. After smashing the dead, according to the secretary, he sent the secretary to check the situation and then came down by himself. So what did he do during this period? According to speculation, this method requires a thin wire to connect the monitor and I-shaped steel, which may be a piano wire or a fishing wire. However, we did not see that wire, and it is very likely that he had to put it away, and there should be no time to deal with the wire. He just tried to leave just to deal with it. Now it may be on his body or in his office."

"The last step is to confirm. You go to contact our department to apply for a search warrant. I'll talk to the president. OK, get out of class is over." Everyone dispersed and each performed their duties.

Mizumatsu walked into the office, and the president immediately came up and asked, "How is the police officer? Is there any result?" Mizumatsu felt that he was not in good condition, as if he was very nervous.

"Sit down first, let me talk about the police's discovery," Mizumatsu nodded and said.

"Now we found out...bala bara...so guess you...bala bara bara...and let him come here to talk to you, calculate the time he walked into the alley, use the harmonica to prolong the time he stood there, and use the monitor to swing the I-shaped steel to smash the dead."

"Well, as the police officer said, as long as you understand the rules, anyone can use the automatic swing of the monitor to commit a crime!" the president defended.

"The suspect is roughly you and the secretary. According to your statement, the secretary has no time to deal with the wire, so we locked you. And if you use automatic head shaking, how can the prisoner ensure that the I-shaped steel will not fall off the automatic head shaking before the deceased arrives? So only you who are sitting in the office can manually shaking the monitor at the right time. Only you, as the president, can install a monitor with a rotation power much greater than the demand value."

"No, no." The person who sang the opposite tune was not the president, but Kogoro Mouri. "It's not about time, but can be seen."

Mizumatsu raised his eyebrows. The president's office only faced the windows on the street. It is estimated that the president had never come out at the time of the incident. How could he see it?

"At the time of the incident, a cleaning car from the company was parked across the street. But later the president asked to drive away, so you didn't see the police officer," Kogoro Maori talked, "The cleaning car has a characteristic. There is a small piece of glass that can be used as a mirror in the fisheye. My daughter Xiaolan was still looking in the mirror with that piece of glass. I think at that time, President, you should be using a telescope to observe the alley through the glass reflection? Because at that time, Xiaolan looked in the mirror and disturbed your vision, so you pulled down the I-shaped steel in advance, causing the deceased to be killed before picking up the harmonica. I'm right? Mr. President."

Mizumatsu curled his lips. A car was parked opposite the other side of the incident and drove away. He asked them about the situation at the incident eight times before, but no one had said it... These detectives' problems of not cooperating with the police work have been severely changed. No matter what clues there are, they will swallow them in their stomachs and refuse to say them...
Chapter completed!