27 CFR 478.134 - Sale of firearms to law enforcement officers.
(a) Law enforcement officers purchasing firearms for official use who provide the licensee with a certification on agency letterhead, signed by a person in authority within the agency (other than the officer purchasing the firearm), stating that the officer will use the firearm in official duties and that a records check reveals that the purchasing officer has no convictions for misdemeanor crimes of domestic violence are not required to complete Form 4473 or Form 5300.35. The law enforcement officer purchasing the firearm may purchase a firearm from a licensee in another State, regardless of where the officer resides or where the agency is located.
(1) The following individuals are considered to have sufficient authority to certify that law enforcement officers purchasing firearms will use the firearms in the performance of official duties:
(i) In a city or county police department, the director of public safety or the chief or commissioner of police.
(ii) In a sheriff's office, the sheriff.
(iii) In a State police or highway patrol department, the superintendent or the supervisor in charge of the office to which the State officer or employee is assigned.
(iv) In Federal law enforcement offices, the supervisor in charge of the office to which the Federal officer or employee is assigned.
(2) An individual signing on behalf of the person in authority is acceptable, provided there is a proper delegation of authority.
(c) Licensees are not required to prepare a Form 4473 or Form 5300.35 covering sales of firearm made in accordance with paragraph (a) of this section to law enforcement officers for official use. However, disposition to the officer must be entered into the licensee's permanent records, and the certification letter must be retained in the licensee's files.