As to crime stats, do a search on falsified crime stats. Remember, the same people that are telling us the Ft. Hood massacre was "work place violence" also tell us the crime rates.
When we have the schools "diagnosing" (mostly male) students with ADHD we have a problem.
Yeah it's anecdotal but I've seen two cases where the teacher decided the student had ADHD when it was far more a case of the kid being bored to tears in the classroom in large part because by 3rd-4th grade they were smarter than the teacher.