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18 U.S. Code § 3061. Investigative powers of Postal Service personnel
(a) Subject to subsection (b) of this section, Postal Inspectors and other agents of the United States Postal Service designated by the Board of Governors to investigate criminal matters related to the Postal Service and the mails may—
(1)
serve warrants and subpoenas issued under the authority of the United States;
(2)
make arrests without warrant for offenses against the United States committed in their presence;
(3)
make arrests without warrant for felonies cognizable under the laws of the United States if they have reasonable grounds to believe that the person to be arrested has committed or is committing such a felony;
(4)
carry firearms; and
(5)
make seizures of property as provided by law.