In recent years, a growing number of prosecutors have established pretrial diversion programs, either pre-filing—before charges are filed with the court—or post-filing—after the court process begins but before a disposition. Participating defendants must complete assigned treatment, services, or other diversion requirements. If they do, the charges are typically dismissed. With funding from the National Institute of Justice, the current study examined 16 prosecutor-led diversion programs in 11 jurisdictions across the country and conducted impact evaluations of five programs and cost evaluations of four programs. Researchers found reductions in conviction, jail sentences, and rearrests for up to 24 months in three programs.