On September 19, 2023, the Center for Justice Innovation and RxStat convened together stakeholders in the criminal justice and court systems, clinicians, and public health experts to discuss the treatment of drug use and prevention of fatal overdoses in the context of the criminal justice system, as well as the integration of harm reduction principles into these and related programs. Among the pre-conference materials distributed were this document, which maps many of the court-based problem substance use interventions currently utilized across New York City. We divided these initiatives into four stages within the timeline of a criminal case: pre-arraignment, arraignment, pre-plea, and post-plea. This categorization is intended to highlight the distinct role that each stage plays within the larger system of treatment and prevention.