The STRONGER Act reauthorizes and expands a federal program that provides residential substance use disorder treatment in prisons and jails. The bill updates the program to explicitly permit medication-assisted treatment using any FDA-approved medications for opioid and other substance use disorders, moving away from a former focus on abstinence-only approaches. It requires prison and jail staff overseeing these programs to complete training on addiction science, evidence-based treatments, medication options, and continuity of care, and mandates that participating facilities partner with outside providers to ensure patients can access medications after release. The bill allocates $40 million annually for fiscal years 2027 through 2031, with at least 10 percent of each state's allocation directed to local jail-based programs that can serve both pre-trial detainees and sentenced individuals.