The Times has a wrenching account of parents trying to save their son from Adderall abuse. If this is a subject that interests you, the entire article is worth reading. Here is Keith Conners commenting on inadequate evaluation before prescribing:
Some doctors worry that A.D.H.D. questionnaires, designed to assist and standardize the gathering of a patient’s symptoms, are being used as a shortcut to diagnosis. C. Keith Conners, a longtime child psychologist who developed a popular scale similar to the one used with Richard, said in an interview that scales like his “have reinforced this tendency for quick and dirty practice.”
Dr. Conners, an emeritus professor of psychiatry and behavioral sciences at Duke University Medical Center, emphasized that a detailed life history must be taken and other sources of information — such as a parent, teacher or friend — must be pursued to learn the nuances of a patient’s difficulties and to rule out other maladies before making a proper diagnosis of A.D.H.D. Other doctors interviewed said they would not prescribe medications on a patient’s first visit, specifically to deter the faking of symptoms.
There is no psychological questionnaire or test that can be used alone to make a diagnosis of anything.