detention
(20) “law enforcement officer” means an employee, the duties of whose position are primarily the investigation, apprehension, or detention of individuals suspected or convicted of offenses against the criminal laws of the United States, including an employee engaged in this activity who is transferred to a supervisory or administrative position. For the purpose of this paragraph, “detention” includes the duties of— (A) employees of the Bureau of Prisons and Federal Prison Industries, Incorporated; (B) employees of the Public Health Service assigned to the field service of the Bureau of Prisons or of the Federal Prison Industries, Incorporated; (C) employees in the field service at Army or Navy disciplinary barracks or at confinement and rehabilitation facilities operated by any of the armed forces; and (D) employees of the Department of Corrections of the District of Columbia, its industries and utilities; whose duties in connection with individuals in detention suspected or convicted of offenses against the criminal laws of the United States or of the District of Columbia or offenses against the punitive articles of the Uniformed Code of Military Justice (chapter 47 of title 10) require frequent (as determined by the appropriate administrative authority with the concurrence of the Office) direct contact with these individuals in their detention, direction, supervision, inspection, training, employment, care, transportation, or rehabilitation;