CADC (Certified Alcohol and Drug Counselor) is administered by certifying organizations in most states and recognized nationally by NAADAC. CASAC (Credentialed Alcoholism and Substance Abuse Counselor) is the New York State-specific credential administered by OASAS. Both require supervised work hours (typically 2,000–6,000 hours depending on level) and passing a written exam, but the specific hour requirements, training requirements, and exam content vary by state and credential level. CADC-I is typically an entry-level credential; CADC-II requires additional hours and supervision. If you work in New York, pursue CASAC. In most other states, pursue CADC through NAADAC or your state's certifying board.