"A Single-Question Screening Test for Drug Use in Primary Care" Smith, P. C, et. al. Arch Intern Med

“A Single-Question Screening Test for Drug Use in Primary Care”  Smith, P. C, et. al.  Arch Intern Med, Vol. 170 (13), 1155-1160, 2010.  This study of 286 primary care outpatients demonstrated that a single question, “How many times in the past year have you used an illegal drug or used a prescription medication for non medical reasons,” performed well in identifying drug use in primary care patients.