Overdose Prevention Centers and Behavioral Health

Inclusion Criteria: Aims 1 and 2: * are 18 years of age or older; * engaged in syringe service program and/or overdose prevention center services in New York City in the past 30 days before the date of enrollment; * are able to complete assessments in English or Spanish; * are competent to give written informed consent at the time of the interview; * are able to provide informed consent; * self-report use of illicit opioids (e.g., heroin, fentanyl), illicit stimulants (e.g., powder cocaine, crack, methamphetamine), counterfeit prescription pills (defined as prescription pills obtained through the illicit drug market) or any injection drug use in the past 30 days, and * are able to participate for at least 6 months following enrollment. Aim 3 * are 18 years of age or older; * are employed by a harm reduction program; * are able to complete assessments in English; and * are able to provide informed consent. Exclusion Criteria: • Individuals not meeting the criteria detailed above for the respective Aims will not be eligible for participation in this study.