Last fall, I heard something that floored me: The tests we have for ADHD in adults don’t work very well. As an adult with ADHD, I think about this all the time because our diagnosis is so stigmatized and so misunderstood. It’s overdiagnosed. It’s underdiagnosed. Everybody has it. Nobody has it. If only there were a silver bullet or some test that could definitively say yes or no. So, I asked the two Chicago School faculty members who got me thinking about this after their presentation at the CHADD conference last year: Jessica Rosenfeld, a clinical psychologist, and Reneh Karamians, a  neurorehabilitation psychologist. They explained why adult ADHD diagnosis is so difficult, and how new scan technology holds promise for spotting ADHD in the brain.