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The Screener and Opioid Assessment for Patients with Pain—Revised (SOAPP-R) is a self-report questionnaire designed to predict aberrant medication-related behaviors among persons with chronic pain. This measure was developed to complement current risk assessment practices and to improve a clinician's ability to assess a patient's risk for opioid misuse. The aim of this study was to cross-validate the SOAPP-R with a new sample of chronic, noncancer pain patients.Three hundred two participants (N = 302) prescribed opioids for pain were recruited from 5 pain management centers in the U.S. Subjects completed a series of self-report measures and were followed for 5 months. Patients were rated by their treating physician, had a urine toxicology screen, and were classified on the Aberrant Drug Behavior index.Seventy-three percent (73.2%) of the subjects (N= 221) were followed and 66 participants repeated the SOAPP-R after 1 week for test-retest reliability. The reliability and predictive validity, as measured by the area under the curve (AUC), were found to be highly significant (test-retest reliability = 0.91; coefficient α = 0.86; AUC = 0.74) and were sufficiently similar to values found with the initial sample. A cut-off score of 18 revealed a sensitivity of 0.80 and specificity of 0.52.Results of this cross-validation study suggest that the psychometric parameters of the SOAPP-R are not based solely on the unique characteristics of the initial validation sample. The SOAPP-R is found to be a reliable and valid screening tool for risk of aberrant drug-related behavior among chronic pain patients.