The Recovery First Housing Act would require homeless shelters and housing programs that receive federal funding to offer substance use disorder treatment to people admitted to their facilities. The bill applies to emergency shelters, transitional housing, and permanent supportive housing programs that participate in the McKinney-Vento Homeless Assistance Act, one of the main federal programs addressing homelessness. The treatment must be evidence-based and delivered by licensed providers, with options ranging from medically supervised detoxification to medication-assisted treatment and step-down approaches that gradually transition people to community-based services. The requirement would not apply to unaccompanied minors. The legislation does not specify new funding amounts or implementation timelines, meaning it would need to be implemented within existing federal homeless assistance program budgets.