911 emergency operators, adult detention, juvenile detention, and law enforcement services with jurisdiction within the exterior boundaries of the Cheyenne River Sioux Tribe.

Protects the rights of the citizens within its jurisdiction to be free from criminal attacks, to be secure in their possessions and to live in peace. Year-round prescription drug take-back site.

Within the Flandreau Santee Sioux Tribe are the following services - Tribal Police Department - Law Enforcement Services (offers fingerprinting, background checks, and gun locks), social services, enrollment, tribal courts, child care, Dakota language, Department of Natural Resources, Education, Tribal Health Clinic, Counseling Center, Grace Moore Senior Center, Housing, and Wellness Center.