Family physicians have an opportunity to identify substance abusers ye
ars before they have medical complications or present for drug treatme
nt. Occult substance abuse can be effectively identified by simple scr
eening questions and careful attention to clinical indicators during t
he history and physical examination. Early intervention may have drama
tic effects on substance-abusing behavior and may prevent the many adv
erse medical, psychologic and social effects of substance abuse in the
se patients.