well probably they tend not to get that because once you've done time in the U.S you're screwed whether it was for stealing a candy bar, dealing drugs, or murder.

On the other hand the exception to that rule would be - I've known guys who were drug addicts, caught, go through rehabs, and become counselors and psychologists in the judicial system. Which is pretty close to the scenario under discussion.

on edit - ok only know two guys who did that, but they exist.

But never police or doctors who can prescribe drugs.

You'll be surprised to know how many doctors and police officers around the World made use of drugs, went through rehab and still do a decent job...

well sure, in America.