Chapter 1219: Patrolling the Street

Mu Zhiyang was in the front, walking with the momentum of six horses, leading Jiang Yuan and others along the road.

At the other end of the road, several criminal police officers from the Criminal Police Detachment stared at the vendors on the side of the road, expecting the perpetrator to be unable to bear the pressure and turn around and run away.

In fact, this kind of work of blocking the road is often done by the police officers of the police station, or two teams of criminal police officers other than the task force are arranged.

But this has reached the last step, the time to arrest, who is willing to let go of the great merit in hand, just to save some effort.

On the contrary, the criminal police officers of the Zheng Guang Bureau Criminal Police Detachment are now the most excited.

Solving homicide cases is not rare for Jiang Yuan and the Jiang Yuan Cold Case Task Force now, but for ordinary criminal police officers of the Criminal Police Detachment, arresting homicide suspects is always a rare opportunity.

In fact, Mu Zhiyang is still quite rare.

He took the lead, stood tall and straight, came to the meat sandwich stall on the street, stared at the kitchen knife in his hand with one eye, and said: "Boss, we are from the Criminal Police Detachment, ask you a few questions."

"Heard someone died?" The boss is a short and thin man, and he chopped the kitchen knife into the chopping board with a bang, and instead asked Mu Zhiyang.

"Where did you hear it?" Mu Zhiyang didn't answer, staring sharply at the boss and his kitchen knife.

Wen Yong stepped forward, pressed the handle of the kitchen knife, and took it into his hand.

The short and thin meat sandwich stall boss laughed "haha": "You are so nervous... We have a group, heard that you are doing inspections or something, originally prepared to run, later said it was not urban management, by the way, do you eat buns, 8 yuan each, give you more meat."

"Not now." Mu Zhiyang lifted the crotch cloth under his stall, looked at it and asked: "Do you have any other knives?"

"No, we all use one kitchen knife to conquer the world..."

"Don't you have any meat-trimming knives or something?"

"I use the best pork belly, you look..." The short and thin meat sandwich stall boss said and picked up a spoon, fished out meat from the pot to show a few people.

Jiang Yuan stepped forward at this time and said: "Last Tuesday morning, where were you?"

The laboratory report came out one after another, and Jiang Yuan also reopened "temporary +1" to judge the time of death.

As of now, Jiang Yuan can shorten the interval of the victim's time of death to within two hours in the morning. Calculated this way, the time the killer started to kill should be shorter than the time the mobile phone signal disappeared. In other words, the mobile phone is likely to be handled by the killer, and the time the deceased was hijacked is also very short.

To describe it in not so pleasant terms, the killer should have been in a busy state during the few hours of hijacking the victim, so the alibi on Tuesday morning is very important, and it is also the key for the police to screen these food sellers.

The meat sandwich stall boss didn't care much and smiled: "Where else can I be, just selling meat sandwiches here."

"What is the specific time from what time to what time?" Mu Zhiyang turned his head back, took out his notebook to make records, he is also a criminal police officer.

"I usually arrive at 6 o'clock in the morning, and open for business if someone opens for business. If there is no one, I will organize it first, then open takeout, and then chop meat or something, and work until the afternoon to rest for a while, and then continue to do it at night, my wife buys meat and boils meat at home, very tired..."

"7 o'clock in the morning to 1:30 in the afternoon? Or 6:30 to 1:30?"

"6:30 to 2:30 is about the same, some takeouts are bought very late now..."

"Other vendors you noticed who were with you at the time? Which ones were open?" Mu Zhiyang asked next. These questions are to be thrown to every merchant. If you compare the statements later, if someone talks nonsense, you can easily find it.

Correspondingly, if several people can prove someone's alibi, he is basically excluded from the suspect list.

For the police, listing the suspect list is important, and shrinking the suspect list is more important. It's just that once the mechanism is wrong and the wrong sieve is chosen, resulting in missing suspects, the whole set of lists is finished. The Silver Case and the Gold Case in the past were all like this.

Mu Zhiyang asked a few more questions, and then marked a star in his notebook.

This is basically excluding suspicion, but this is just the score given by Mu Zhiyang. The subsequent Wang Chuanxing and Liu Jinghui will also give their own scores and choose whether to exclude.

The suspect list is a total of 60 households, less than 200 people. Screening all of them, if you can screen out a high-suspicion one, this set of screening can be considered a perfect curtain call. Anyone who wants to write an article later can also do it.

But if you can't screen it out, you need to use other means. For example, technical investigation checks mobile phones, and image investigation checks surveillance, and they only need the suspects on the list to report their location themselves.

Nowadays, mobile phones are basically inseparable. In the Beijing area, the number of base stations is enough to perform triangulation in most locations. Information like being in a certain section at a certain time is the simplest work for technical investigation.

Similarly, using surveillance to find perpetrators, without uncertain time and location, is naturally very difficult to find. But letting every suspect report which intersection they passed at a certain time, and then investigating and verifying it, is too simple.

Similarly, using surveillance to find a perpetrator without a fixed time or location is naturally very difficult, but having every suspect report which intersection they passed through at a certain time, and then investigating to verify it, is too simple.

Jiang Yuan followed Mu Zhiyang to check the meat sandwich stall boss, and then checked a boss selling fries and fried chicken. When he wanted to move forward, he found that a street had been asked, and the remaining two or three vendors were also surrounded by several times more police officers.

"Change a street?" Jiang Yuan asked.

"No, it's just so big. We all came out together. A small vegetable market three kilometers away is almost asked." Liu Jinghui has been paying attention to the progress of all aspects.

Jiang Yuan frowned, then looked at Liu Jinghui and asked: "Not cooking? Drug-related? Chemical plant?"

The benzoic acid and acrylamide found before are also useful in medicine, but the content in medicine is too small, and people who take medicine are unlikely to come into direct contact with them, and then come into secondary contact with the plastic strip. And the chemical plant that can come into contact with a large amount, Jiang Yuan is actually not very sure. Not to mention anything else, the small workshops that come into contact with these chemical raw materials now also know to wear gloves.

Liu Jinghui said: "I checked, there is no chemical plant in Jinshan that uses both raw materials at the same time. Actually, even if they are used at the same time, it is not necessarily that one person can come into contact with them. I also checked the chemical store, and there is no such store nearby. If it doesn't work, expand it and see their distributors and suppliers, but don't worry..."

"Why?"

"There are vendors who didn't set up stalls, I asked people to find them."

"Good." Jiang Yuan couldn't help nodding. The food vendors who didn't set up stalls on time, the suspicion degree increased greatly.

"You stand away, this is your box, right?"

In the distance, Xiao Si's voice rose several degrees, and it came from far away.

Jiang Yuan and others couldn't help but look over.

I saw Xiao Si standing in front of the pancake fruit stall, just taking a box tied with light blue plastic strips from under the cover cloth of the other party's tricycle.

?? Wrote very smoothly the day before yesterday, got up yesterday morning, rewarded myself with X steaks, one of which might be too raw, the digestive system has been operating very hard, and the result was a day of coding, and didn't finish

He saw Xiao Si standing in front of the scallion pancake stall, just as he took a box tied with light blue plastic tape from under the cover cloth of the other party's tricycle.

?? I wrote very smoothly the day before yesterday. When I got up yesterday morning, I rewarded myself with X steaks. One of them might have been fried too rare, and my digestive system has been struggling to function ever since. As a result, I typed for a whole day and didn't even finish one chapter... I woke up this morning and confirmed that it had been digested...

? (End of chapter)