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47 Cigarettes, Smokeless Tobacco, and Electronic Nicotine Delivery Systems| pe.usps.com
Live Animals: Mailing live animals for the purpose of participating in an animal-fighting venture, as defined in 461(b), is prohibited, regardless of the venture‘s legality within any U.S. state, district, commonwealth, territory, or possession. Violators are subject to criminal penalties under 7 U.S.C. § 2156 and 18 U.S.C. § 49.| pe.usps.com
Nonmailable knives or sharp instruments discovered in the mailstream must be reported to the Inspection Service in accordance with POM 139.117.| pe.usps.com
43 Firearms| pe.usps.com
422 Mailability| pe.usps.com
349 Class 9 Hazardous Materials| pe.usps.com
343 Flammable and Combustible Liquids | pe.usps.com
342 Gases (Hazard Class 2)| pe.usps.com
USPS Packaging Instruction 3B| pe.usps.com
HELPFUL LINKS| pe.usps.com
Cremated remains| about.usps.com
USPS Packaging Instruction 3A| pe.usps.com
453 Controlled Substances and Drugs| pe.usps.com