An Evaluation of a Social Network Intervention for Primary and Secondary Prevention of Opioid Overdoses

Inclusion Criteria for Index participants: * self-reported use of opiates including heroin, fentanyl, or prescription opiates to get high at least 2 times in the last two weeks; * willing to invite a network member who uses drugs to the study; * ages 18-years or older; * living in the Baltimore metropolitan region, and * not previously enrolled in the study or currently enrolled in another Lighthouse study. Inclusion Criteria for network participants: * self-reported use of illicit injecting or non-injecting opiates at least 2 times in the last two weeks; * sees the Index participant 2 or more times in the past week; * ages 18 years or older; and * living in the Baltimore metropolitan region. Exclusion Criteria: * Index participants may not take part in the study as a Network participant. * Network participants may not take part in the study as an Index participant.