Chen Xiao was focused solely on reviewing the alibi provided by Ye Jun.
The alibi could be considered as two separate accounts.
The first account was for the day when Professor Yuan Keyu had the incident, stating his whereabouts. Were there other people to vouch for him at that location?
The second account: the night Officer Dou Zhihai died, where was he? Were there others who could confirm his presence at the location?
Both alibis had ample human evidence.
Or rather, both alibis could practically be treated as the same one.
Because the answer was the same.
Ye Jun was at school.
The ones vouching for him were teachers and dorm roommates.
During the incident involving Yuan Keyu, Ye Jun had consulted teachers on some study topics.
The teacher remembered clearly spending nearly two hours with Ye Jun that day.
After those two hours, Ye Jun returned to the dormitory, chatted with fellow students briefly, and then the entire dorm went to sleep.
