28 CFR 0.29j - Law enforcement authority.
Subject to guidelines promulgated by the Attorney General, Special Agents of the Office of the Inspector General are authorized to:
(a) Detect and assist in the prosecution of crimes in violation of the laws of the United States and to conduct such other investigations regarding matters that are within the jurisdiction of the Inspector General;
(b) Serve legal writs, summons, complaints, and subpoenas issued by the Inspector General or by a Federal grand jury;
(c) Receive, transport, and provide safekeeping of arrestees and other persons in the custody of the Attorney General or detained aliens;
(d) Arrest without warrant any person for an offense against the United States committed in the presence of the Special Agent or whom the Special Agent has reasonable grounds to believe has committed or is committing a felony cognizable under the laws of the United States;
(e) Seek and execute search and arrest warrants;
(f) Carry firearms while on-duty; and
(g) Carry firearms while off-duty as authorized by the Inspector General.