(a) Screening of mail transported by aircraft—(1) Authority. Pursuant to 39 U.S.C. 5401,the,regulations,and.S.C. 40101 et seq.], or any order, rule, or regulation made by the Secretary of Transportation thereunder, as may be necessary for such transportation, except as otherwise provided in 39 U.S.C. 5402.

(2) Purpose. To prevent and deter the carriage of unauthorized explosives, incendiaries, or other destructive substances or items in the mail or in postal products onboard aircraft and to ensure the security and safety of all persons and property onboard aircraft carrying mail.

(3) Policy. Mail of sufficient weight to pose a hazard to aviation may, without a search warrant or the sender's or addressee's consent, be screened by any means capable of identifying explosives, nonmailable firearms, or other dangerous contents in the mails that are destructive or could endanger life or property.

(b) Screening of surface transported mail—(1) Authority. Pursuant to 39 U.S.C. 404,the,among,the. Mail may be screened without a search warrant or the sender's or addressee's consent in exigent circumstances to identify explosives or other dangerous contents in the mails.

(2) Purpose. To prevent and deter the carriage of unauthorized explosives or other dangerous content in the mail or in postal products transported via surface transportation providers and to ensure the security and safety of all persons and property associated with mail usage, processing, handling, and transportation.

(3) Policy. When the Chief Postal Inspector or designee determines there is a credible threat that certain mail may contain a bomb, explosives, or other material that could endanger life or property, including nonmailable firearms, the Chief Postal Inspector or designee may, without a search warrant or the sender's or addressee's consent, authorize the screening of such mail by any means capable of identifying explosives, nonmailable firearms, or other dangerous contents in the mails.

(c) Mail screening restrictions. Screening of mail authorized by paragraphs (a) and (b) of this section is subject to the following restrictions:

(1) No unreasonable delay. The mail must be screened in a manner which does not unreasonably delay its delivery.

(2) Authorization to screen mail. The mail screening may be conducted by Postal Service employees or persons not employed by the Postal Service, as authorized by the Chief Postal Inspector, under such instruction that requires compliance with this part and protects the security of the mail. No information obtained from this mail screening may be disclosed unless authorized by this part.

(3) Mail of insufficient weight to pose a threat. Mail of insufficient weight to pose a hazard to air transportation, surface transportation, or to contain firearms must be excluded from such screening.

(4) Additional limitations. The screening must be within the limits of this section and conducted without opening mail that is sealed against inspection or revealing the contents of correspondence within mail that is sealed against inspection.

(d) Identified threatening pieces of mail—(1) Hazardous mail. Mail, sealed or unsealed, reasonably suspected of posing an immediate danger to life or limb or an immediate substantial danger to property as a result of screening or other information may, without a search warrant, be detained, opened, removed from postal custody, processed, and treated, but only to the extent necessary to determine and eliminate the danger. Such mail must be processed in accordance with the instructions promptly furnished by the Inspection Service.

(2) Indeterminate mail. After screening, mail sealed against inspection that presents doubts about whether its contents are hazardous, that cannot be resolved without opening, must be reported to the Postal Inspection Service. Such mail must be processed in accordance with the instructions promptly furnished by the Inspection Service.

(3) Mandatory reporting. Any person who opens mail sealed against inspection, in accordance with paragraph (d)(1) or (2) of this section, is required to provide a complete written and sworn statement regarding the detention, screening, opening, and treatment of the mail piece, as well as the circumstances surrounding its identification as a possible threat. The statement is required to be signed by the person purporting to act under this section and promptly forwarded to the Chief Postal Inspector. Any person purporting to act under this section who does not report his or her action to the Chief Postal Inspector under the requirements of this section, or whose action is determined after investigation not to have been authorized, is subject to disciplinary action or criminal prosecution or both.