Comment by jrapdx3

> ... I wonder why they don't just give people some ritalin and ask if they feel calmed down? Except the obvious reason of course

In ADHD (and most conditions) diagnosis by medication response is not acceptable. Response to drugs is highly variable and fails criteria for acceptable tests. Also drugs can produce side-effects. According to professional standards, it's unethical to expose people to nontrivial risks without good cause.