Special Investigative Services

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Special Investigative Services (SIS) is a department within the Correctional Services Branch in Federal Bureau of Prisons institutions that investigates suspected criminal activity or other activity contrary to prison discipline. This can include both prisoner activity and employee activity.[1] SIS often relies upon confidential informants whose identity need not be revealed to the accused in Disciplinary Hearing Officer proceedings.[2] SIS staff sometimes assist the Federal Bureau of Investigation in solving crimes that occur in federal prisons.[3]