This study determined the readability, test-retest reliability, and internal consistency of a questionnaire designed to assess the HIV risk behaviors of ex-prisoners. The questionnaire was administered twice within a 2-week interval to 119 ex-prisoners. The test-retest agreement for the questionnaire's 25 HIV behavior items ranges from 82% to 100%. Of these 25 items, agreement was ''fair'' (k = .20 to .40) for 1, ''moderate'' (k = .40 to .60) for 5, ''substantial'' (k = .60 to .80) for 11, ''almost perfect'' (k = .80 to .99) for 7, and ''perfect'' (k = 1.00) for 1. The overall Cronbach's alpha (Cα) is .81 (p.001). By subscale, the Cα for tattooing, .89; body piercing, .93; injection drug use, .93; and HIV risk sexual behavior, .79. Based on these findings, the authors conclude that the questionnaire is reliable and internally consistent.