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Publication 52 - Hazardous, Restricted, and Perishable Mail >
7 Air Transportation Requirements > 72 Hazardous Materials: Air Transportation > 727 Refusal by Air Carrier
Mailpieces refused by an air carrier that contain hazardous material, or are suspected to contain hazardous materials, must be handled in accordance with 711.
Mailpieces containing nonmailable or improperly packaged hazardous materials that were inadvertently accepted for mailing should be stopped where identified and not presented to an air carrier. They should be handled in accordance with the Aviation Mail Security Hazardous Materials Program Instructions. Additionally, to prevent future shipments from being incorrectly accepted for mailing, notify the mailer and the Post Office of mailing of the problem.