The Validity and Reliability of Self-Reported Data from Heroin Addicts: Mailed Questionnaires Compared with Face-to-Face Interviews

Abstract

Immediately following receipt of their 1-year follow-up mailed questionnaire, 55 former patients from an addiction treatment program were interviewed personally, and a urine sample was collected. Results indicate a high degree of correspondence of self-reported drug use with the urinalysis reports, and moderately