General: “Under 18 U.S.C. 1716, all matter that is outwardly or of its own force dangerous or injurious to life, health, or property is nonmailable. The knowing deposit of such matter in the mail is a crime punishable by fine, imprisonment, and/or other penalty.”
-USPS Publication 52 Hazardous,Restricted, and Perishable Mail.p9
Mailer Responsibility: “Mailers need to be aware of current or new regulations adopted by the Postal Service and other governmental agencies.”
-USPS Publication 52 Hazardous,Restricted, and Perishable Mail.p10
USPS Resources
USPS Hazmat Tutorial
What Qualifies as Hazmat
Publication 52 Hazardous,Restricted, and Perishable Mail
USPS Hazmat Webinar