Many grantees of the Comprehensive Opioid, Stimulant, and Substance Use Program (COSSUP) and others working at the intersection of criminal justice and behavioral health, regularly interact with groups that have been historically disadvantaged and marginalized, including people of color, tribal populations, low-income individuals, the formerly incarcerated, and people with mental and physical disabilities. This publication highlights the importance of building and maintaining community trust when implementing criminal justice and behavioral health initiatives.