Substance Abuse and Mental Health Services Administration (SAMHSA): Overview of the Agency and Major Programs [June 23, 2020] [open pdf - 1MB]
From the Background and Role: "The Substance Abuse and Mental Health Services Administration (SAMHSA) is the federal agency primarily responsible for supporting community-based mental health and substance abuse treatment and prevention services. Located within the Department of Health and Human Services (HHS), SAMHSA provides federal funding for these services by administering two large formula-based block grant programs(one for substance abuse prevention and treatment services, the other for mental health services) and other formula and discretionary grants to local communities, states, and private entities. SAMHSA does not directly deliver treatment services. Rather, it supports state and local efforts in providing mental health and substance abuse (collectively known as behavioral health) services, primarily through funding and technical assistance."
CRS Report for Congress, R46426
Congressional Research Service: https://crsreports.congress.gov/