Does NC really have more ADHD than any other state?
at the 2012 CHADD conference in San Francisco, Dr. Hinshaw told an rapt audience that his UC-Berkley psychology lab showed that the highest prevalence of ADHD among children was found in states that had implemented achievement-based testing for promotion from one grade to another. In other words, when children were required to pass a state-mandated test to go to the next grade level, more ADHD was discovered (as the likely culprit for failure).