There are all sorts of legal rules concerning searches and seizures under the First Amendment. In this case, a physical patdown and search should be their first priority when they gained custody of the suspect. I made certain I would never be exposed to criminal law after working in college as a abuse allegation investigator in the NYC jails. My early life was hard. I wanted to be surrounded by nice people and things.
Unless you practice in the area or are taking a Criminal Procedures course at the moment, it is complex. It changes frequently, too.
Something very strange happened. My top goals would be: 1. security concerns 2. obtaining information from a living suspect.