You would not believe how many people are prescribed medications for "anxiety" - and many other psych issues. Many of these people shouldn't be driving either.

I've attended auto crashes where the pedestrians and occupants of the "other car" all had consistent recollections of what just happened, but the driver of the car that caused the crash, who was on prescription "anti-anxiety" medications had a completely different version of events - not supported by physical evidence, nor the other eyewitnesses.  

I'm not talking of differing in a couple of small details, I'm talking this driver couldn't even recall which way they had turned onto the street, from what direction, at what speed, or even where they were going.