Many medical organizations require a licensed psychologist to write the prescription for ADHD medications, rather than the attending PCP, and many insurance plans don't cover psychologist visits.
As a psychologist, my experience is that lots of physicians, even psychiatrists, want testing and a diagnosis from a psychologist before prescribing, so it might look like the psychologist is prescribing, when they are just diagnosing.
Incidentally, psychologist prescribing happens in some states also.
