From that clue, they separated into to two teams. One would go to check the CCTV. There should be CCTV's where the room that had access to those drugs. A normal person would never have the access for the room unless the hospital's staff itself.
And also there was a CCTV in the wad where the patient was staying. It might capture the person that administered the drugs into the patient's body.
However, the clues ended. On that day, the CCTV at the drug's room was broken. As for the CCTV in the wad captured nothing indifferent about the patient.
As for another team, they investigated the drug's room itself. They found out that amount of the drugs stored in the drug's room did not match the written amount in the document.
Meaning someone had been stealing it. The missing amount of the drug matched the amount found in the patient body. Even though they found this information but it still did not help in clearing Yu Qi's name.
...
