Gateway began providing community-based treatment services in Delaware in 2004. In recent years, Gateway expanded their services to provide Cognitive Behavioral Therapy within the Department of Correction. In 2019 services were expanded to provide assessment and SUD intervention services in all four probation and parole offices located throughout the state. While Gateway no longer provides Cognitive Behavioral Therapy services, the assessment and SUD intervention services continue to be provided at all probation and parole offices.