After watching the surveillance footage, Li Banfeng asked a question: "Was the cigarette butt left by this group of people?"
Director Zhang spoke very cautiously: "There is some saliva left on the cigarette butt, which is currently being tested. Before the test results are out, we cannot be completely sure of the source of the cigarette butt. But judging from the current clues, the cigarette butt is most likely left by them."
Li Banfeng looked at Director Zhang and said: "How could they smoke with gas masks on?"
Director Zhang also knew this detail was not very reasonable: "The current inference is that they put on gas masks after entering the plant area."
"You mean they smoked a cigarette to relax before putting on the mask and casually left the cigarette butt on the ground?" Li Qi continued to stare at Director Zhang.
Director Zhang made no response; the cigarette butt issue was indeed hard to explain, but the entire process's reasoning was mostly flawless.
