In addition, recent research has documented elevated rates of HIV infection among incarcerated populations compared to the general population, with prevalence of HIV among inmates in US prisons being estimated to be 6 to 10 times higher than in the general population. Upon release from prison, parolees often immediately resume high-risk behaviors that they engaged in prior to incarceration. Because of the high level of exposure to HIV infection that accompanies drug use, particularly by injection, drug treatment programs for high-risk offenders can serve as a valuable setting for preventing the spread of HIV, both through HIV prevention/education activities and through access to HIV testing and counseling.