Correctional administrators and health care providers are on the frontlines of the opioid epidemic as justice-involved individuals are disproportionately at risk for opioid use disorder (OUD) and dying from an opioid overdose. This toolkit provides correctional administrators and health care providers with the information necessary to plan and implement MAT programs within jails and prisons. Organized by core components, each section offers actionable steps, implementation questions, real-world case examples, checklists, tools, and resources drawn from the latest research, subject matter experts and experiences from diverse settings across the U.S.