Have screenwriters never heard of police radios?
In other threads on this board, folks have complained about the unrealistic portrayal of movie mental hospitals in this film and others. I can't speak to that issue, but another recurring piece of evidence for indicting screenwriters involves any sequence (pick your movie, including this one) in which the protagonist is being pursued in a car chase by police. Even if one is able to swallow the ridiculousness that an individual driving a motorhome could lose a police cruiser on a highway, that's the stuff "suspension of disbelief" is made of, radio technology has been around long enough--and I hope it is fairly widely known that police have access to such technology--that...
I'm sorry. I just couldn't finish that statement. If you can't figure out how it ends, then maybe there's a screenwriter position waiting for you in Tinseltown.
On a somewhat related rant, it seems movie police officers (even staties and elected sheriffs) are required to have a level of intelligence that is less than that of an average toad stool (and I'm not talking about mushrooms). No, I've never been employed as a peace officer, but some of the most insightful folks I have ever known were. Maybe some writers need to put away the mind-altering substances and try getting some insight-improving experiences.