The tape recorder Wang Shiying gave to Du Da was playing quietly on his desk.
Du Dayong suddenly felt as if he had been struck by lightning.
What if someone recorded the sound with a tape recorder and then played it at the entrance of the alley? What if the sound recorded was the cry of a child or the cry of a woman, would it attract a woman like Pan Guanghui to enter the alley?
If a Walkman and a small speaker are played at that time, can it be transmitted to the entrance of the alley?
Du Dayong quickly took out the blank audio tape he bought, then called two more female police officers and started recording in the conference room.
One section is for a female police officer to call for help, and the other section is for a woman to cry loudly.
Du Dayong was concentrating on recording here. Unbeknownst to others, even He Miao and Duan Shuhua came running over.
Only when everyone went there did they find out that the Du Institute was conducting investigative experiments.
After Du finished recording here, he quickly drove to buy a small external speaker.
After everything was done, Du Dayong sat down and waited to go to the crime scene around nine o'clock in the evening to do some experiments.
Before that, Du Dayong decided to visit Pan Guanghui's colleagues and the students she had taught. If Pan Guanghui is really a bold and enthusiastic person, as long as the sound can be heard outside, then it really is
Almost like ten.
Thinking about this, Du Dayong took Tu Qijun and ran straight to the addresses of some teachers and students he had visited on the file.
By noon, the results of the visit were indeed what Du Dayong had guessed. Pan Guanghui was courageous, enthusiastic, always helpful, and treated his students like his own children. Such comments abounded.
This made Du Dayong feel a little heavier.
Pan Guanghui was definitely a carefully planned murder.
But before that, why was Pan Guanghui so carefully planned and killed by the criminal suspect?
As long as Pan Guanghui once mentioned it, would Liu Siji know something?
But now Liu Siji has been imprisoned in a mental hospital.
Du Dayong decided to go there in the afternoon, but he couldn't let himself know his identity.
Du Dayong quickly opened the relevant information about Liu Siji and found that Liu Siji also had a relative from out of town, who was from Qinhuang City, Beihe Province.
After looking at the information, Du Dayong decided to pretend to be a relative of Liu Siji in Beihe and go to Liu Siji. After learning that Liu Siji was imprisoned in a mental hospital, he asked for a visit.
But this visit may not be allowed!
Now we can only go to the Huang Bureau and ask him to say hello to Chu Dahui, the director of the Zhongcheng Branch. He must be let in secretly.
Du Dayong was a guy who did what he said, so he directly picked up the phone and called.
It turned out that the staff of the Secretariat Office answered the call and said that Bureau Huang had gone to the Wing Branch Bureau for investigation.
Du Dayong had no choice but to use his cell phone!
As soon as the phone was connected, it was not Bureau Huang himself, but Bureau Huang's secretary.
Du Dayong could only say that he had something urgent to report, and then asked Bureau Huang's secretary to give the phone to Bureau Huang.
"Du Dayong, I'm in a meeting right now. What's your emergency? Tell me quickly."
Du Dayong had no choice but to briefly report the situation.
"Okay, I'll call Chu Dahui after I hang up the phone. However, your actions must be kept secret. Don't expose yourself before you find out anything. That will put a lot of pressure on me."
"Don't worry, Bureau Huang. Nothing will happen to you."
Then there is no more!
Du Dayong didn't care what Huang Ju's attitude was, and went straight to Tie Tujun's place.
Since you have come to seek refuge with Liu Si Si, you shouldn't be too old-fashioned. How can you find connections to go see Liu Si Si?
After telling Tie Tujun his request, Tie Tujun spent more than thirty minutes giving Du Dayong a makeover.
Du Dayong suddenly transformed into a young man in his late twenties, with a dark complexion, a pair of plain glasses, and he seemed to be in sales.
When Chu Dahui received a call from Bureau Huang, he directly greeted the leader of the district health bureau and said that someone had asked him to look at a mental patient.
Sure enough, it was just as Du Dayong thought, it was the leader of the district health bureau who made the call, otherwise Du Dayong would have no chance even if the police wanted to go in and inquire.
Because Liu Siji has become a patient under strict control.
Du Dayong also went out to buy some things, brought a pack of good cigarettes, and took a taxi to the Second Hospital of the City.
I found the leader and told him that I was here to see Liu Siji, and then I was taken to a small room.
The small room is divided into two, with a steel mesh in the middle and a door next to it that can be opened from Du Dayong's side, but cannot be opened from the patient's side.
Liu Siji was brought in after being restrained by a straitjacket. It was not until he was fixed on the iron chair and tied with the restraint belt that the escort left, and Du Dayong could sit across from Liu Siji.
Du Dayong looked around and saw that there was someone standing outside the door, but there was no surveillance camera in the room.
After Du Dayong looked at the surrounding environment, he looked at Liu Siji again.
It was obvious that Liu Siji had been beaten!
"Liu Siji, did someone hit you?"
Liu Siji chuckled a little!
"I have internal strength, I'm not afraid."
After Du Dayong heard these words, his brain almost exploded!