CHAPTER 1397: CHAPTER 1321: SURVEILLANCE ANALYSIS

As soon as Liu Jinghui finished speaking, many faces around him changed color.

Poisoning, and by a convict no less, in the cafeteria—it’s a full house of danger factors.

Prosecutor Lin Qingyun didn’t care about all that, he came to find problems and catch mistakes. As a prosecutor with many cases under his belt, Lin Qingyun asked with much experience, "Was the food in the cafeteria preserved that day?"

Prison warden Old Qin immediately turned to look at the head of the internal investigation department.

The internal investigation department is originally responsible for handling internal prison cases. With more than 4,000 criminals detained in a prison, no matter how tight the system is, they will definitely find ways to commit crimes.

And before reporting upwards, the on-site handling within the prison is also completed by the internal investigation department.

Director Wei Jinchuan was forced to step forward, frowning tightly: "When we arrived, Zhang Jifeng had already been sent to the hospital, and when we processed the scene on our side, there was no food left on site."

"How was the food disposed of? What about the life hygiene department?" Old Qin shouted, and only then did someone squeeze in from behind.

Work related to eating and drinking in the prison is all handled by the life hygiene department. The life hygiene department of Changyang Prison consists of only 5 people: one director, two deputy directors, one senior clerk, and others. With these few people, it’s impossible to manage everything in detail related to the cafeteria; at most, they handle procurement and other businesses.

Therefore, the director of the life hygiene department who was called also looked helpless, saying, "We were in the office building at the time and didn’t know exactly what had happened. We just thought Zhang Jifeng had fallen ill, maybe a heart attack or something, since it was during dinner time and everyone was coming over to eat. The food in the cafeteria should have all been consumed. The problem is nobody reported things like stomachaches; everyone else is fine!"

"The ambulance arrived, and you still don’t take it seriously!" Old Qin thundered.

"No one really told us anything. And there was no sound from the cafeteria at the time, no one expected something like poisoning." The director of the life hygiene department answered cautiously. Whether it’s true or not is unknown, but how people really think inside is unclear.

"Check the surveillance. Let’s see how the food was handled afterward." Liu Jinghui often visits the army, knowing now is not the time for a spectacle. If the investigation hasn’t started, and there are rampant blame-shifting within the prison, their subsequent work will be tough.

The police officer sitting in front of the nine-grid screen adjusted the time under great pressure, pulling out more videos before and after the incident.

This step was much more complicated, unlike the previous videos that could be prepared in advance, making him somewhat flustered.

Jiang Yuan stepped forward voluntarily, saying, "Shall I give it a try?"

The officer first looked up at the prison warden for approval, then asked Jiang Yuan, "Shall I explain the use of this system to you?"

"Sure, let me try first." Jiang Yuan actually knew how to use it. Although there are many types of surveillance systems, most are non-standard products and are very similar. A professional image investigator might need time to adapt to a switch, but Jiang Yuan’s Level 3 proficiency in tech defense monitoring technology covers the entire range.

Moreover, Changyang Prison uses Hikvision’s centralized tender system. Even if there are special requirements, the basics of such surveillance systems are still within the template scope.

Therefore, while Jiang Yuan said he will give it a try, his hands were already tapping the keyboard, fiddling with the console. Right in front of the officer, he first checked the system logs, then the device status, followed by categorizing videos by "time", "channel", and "event type".

And the police responsible for the surveillance onsite actually only have basic operational skills. If he had doubts about Jiang Yuan’s quick log retrieval and reading methods, Jiang Yuan’s skilled video categorization made him realize things were not simple.

He couldn’t help but look with pleading eyes towards the third-party maintenance personnel in the crowd.

The other party also noticed Jiang Yuan’s operation and gave an awkward smile.

"Count off!"

"One, two, three..."

Jiang Yuan externalized the sound from the surveillance and turned it up.

Everyone’s attention was immediately drawn to it.

What Jiang Yuan played was the scene inside the cafeteria at the time of the incident.

The interior of the prison cafeteria is decorated identically to a school cafeteria. Changyang Prison has about 50 tables, all with four seats. Both the tables and chairs are made of steel and are built as a set, and both the legs of the tables and chairs are welded to the ground. The floor is a terrazzo floor, not very attractive, but functional.

On the surveillance screen, a team of convicts had just finished dinner, counted off and went to wash dishes.

Simultaneously, another team of convicts lined up to enter, but after arriving, they didn’t sit immediately. They also lined up to count off, then moved to their fixed positions, watched their bowls being filled, and last, with an order, sat down together, and then... started singing, and then counted off again.

It was finally time to wolf down the food, totaling less than 5 minutes, eating as much as they could; if not, they had to get up and leave because another team from another area was already waiting with their bowls.

Jiang Yuan watched several angle videos and finally confirmed, "The food made in the kitchen was indeed eaten completely."

Prison warden Old Qin breathed a sigh of relief: "Indicates that even if there was poison, it wasn’t in the food cooked in the kitchen."

"Not necessarily. Maybe it was evenly distributed, the dose too small, or the poison had conditional triggers, like mouth ulcers." Jiang Yuan refuted Old Qin’s idea first, changing his tone: "However, I didn’t see Zhang Jifeng eating anything."

Saying that, Jiang Yuan started tossing various videos onto the screen before him, dizzying everyone around.

Prosecutor Lin Qingshan, who regularly works with police, hadn’t seen anything like this before either; he looked around, feeling Liu Jinghui was more reliable, so he asked, "I thought we were having a case discussion to determine the investigation direction."

"If a direct investigation direction can be determined, isn’t that faster?" Liu Jinghui naturally supported Jiang Yuan, although he also felt Jiang Yuan was a bit too eager in his approach.

Jiang Yuan continued sifting through videos for about 20 minutes.

Lin Qingshan simply pulled Liu Jinghui to discuss.

Including Old Qin and Huang Qiangmin were all seasoned, since they couldn’t manage Jiang Yuan, they went on with their tasks.

Old Qin spoke about his internal investigation situation, while Lin Qingshan elaborated on several investigative conclusions from the past two days, primarily focusing on the information provided by the convicts.

With a death in the prison, the prison police were tense, but for the convicts, it was nothing short of a carnival.

Not celebrating death per se, but every one was thrilled and anticipatory for possible merits.

Within two days, Old Qin and Lin Qingshan both collected a large number of testimonies and made many records.

Whether it was Zhang Jifeng’s cellmates or fellow inmates who occasionally saw him, everyone seemed an eager close friend of Zhang Jifeng, vividly describing various situations of Zhang Jifeng, inevitably including guesses and fabrications.

The prison’s penal execution department handles affairs like sentence reduction, parole, and medical bail; Changyang Prison has a lot of serious criminals, and with good luck, one merit can reduce a sentence by several months or even a year.

"Zhang Jifeng didn’t eat anything."

Jiang Yuan quickly finished watching the videos. He gave this conclusion, and immediately interrupted the discussions of Liu Jinghui and others, quickly sparking new discussions:

"He didn’t eat anything? Then he wasn’t poisoned?"

"There are not few toxic gases too."

"Where in the prison would have these things."

"Liquefied gas is toxic."

"Clearly, it’s not such things."

Liu Jinghui was a bit more serious now, saying, "Personnel who came into contact with Zhang Jifeng need to be questioned carefully, especially the few convicts who had initial contact with Zhang Jifeng and the police who arrived first, should all redo their testimonies."

"What worries you?" Old Qin had no choice but to stand out and ask.

"Obstructed images occur at this time. Anything is possible; maybe someone bumped Zhang Jifeng’s heart causing cardiac arrest could also be possible." Liu Jinghui frowned, asking, "What is Zhang Jifeng’s cause of death? Was an autopsy performed?"

"It was originally supposed to be autopsied yesterday. Now, will Director Jiang do the autopsy?" The prosecutor looked at Jiang Yuan, trusting Jiang Yuan more than other forensic doctors from the same system.

Jiang Yuan nodded: "I’ll go perform the autopsy now, Director Liu will continue to cooperate with you."