Patients in both the IA and VA groups perceived some level of coercion to enter into treatment for SUDs. The VA and IA groups experienced similar overall levels of perceived coercion, but the VA group reported higher levels of perceived coercion from internal sources (Self subscale). As expected, the IA group scored significantly higher on the Legal subscale. All patients with SUD, whether involuntarily or voluntarily admitted, experienced high levels of perceived coercion that was unrelated to the law. Internal sources of perceived coercion were dominant in both groups.