This five-year study examines the effectiveness of buprenorphine treatment provided to previously-addicted inmates(N=320; 160 males, 160 females) initiated in prison and continued in the community. The study also examines the extent to which the setting of post-release buprenorphine is provided.It is expected that participants receiving in-prison buprenorphine will have superior outcomes compared to participants who did not receive in-prison buprenorphine.