He had a court appointed independent medical team for that. Neither the judge nor you or I as layman can tell by looking as it was a car accident scene or something.
Judges frequently go to the scene of a crim to get a better idea of what the lawyers are talkinag bout. Hell they sometimes conduct the days business in a case from the scene of where the even ocurred.
Are you telling me this judge shouldn't have done the same thing in such an important high profile case?
Because some of the criteria that would rule out being PVS would be visible even to a layman.