It's difficult for doctors to diagnose adult ADHD, or attention-deficit hyperactivity disorder...So, Dr. Jon Hallberg, MPR News' regular medical analyst, has a policy for adults who come into his clinic and think they have ADHD. First, his clinic refers them to a psychologist to undergo comprehensive testing. Then they can talk treatment if necessary...To hear more from Hallberg on adult ADHD, use the audio player above.