Because they couldn't find any direct poison, and the hospital didn't provide a clear poisoning report, the police were very limited in what they could do. They couldn't possibly summon all the suspects to the station for questioning, and even investigating their social connections was primarily cursory visits.
However, thanks to these quick and timely actions, they were able to "confirm" the rumor that Zhou Yunyun was poisoned, quashing the "mentally unstable class monitor incident" version that was brewing and about to spread.
After all, if it was really a mental breakdown, there wouldn't be this many police officers involved.
Tan Yunlong was assigning the next phase of investigation tasks and directions, while Li Zhiyuan and Lin Shuyou left the dormitory building first and got into the police car they arrived in.
Lin Shuyou felt a bit excited and jittery, "Brother Xiao Yuan, what do we do next?"
"There's a very simple way."