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Keystone offers nationally accredited and licensed services - including education, prevention and treatment (both outpatient and inpatient) – to meet the needs of individuals, families, and groups in York County and surrounding areas experiencing alcohol and/or drug related problems. Keystone Substance Abuse Services is the county's largest provider of treatment and prevention services. Keystone is nationally accredited by the Commission on Accreditation of Rehabilitation Facilities and adheres to the definition of addictive disease as developed by the American Society of Addiction Medicine and the standards for service placement. Keystone is a charter member of Behavioral Health Services Association of South Carolina. The South Carolina Department of Health and Environmental Control and the South Carolina Department of Alcohol and Other Drug Abuse Services annually inspect Keystone.