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Publication 52 - Hazardous, Restricted, and Perishable Mail >
3 Hazardous Materials > 32 General > 323 Mailer Responsibility
Full responsibility rests with the mailer to comply with all Postal Service and non–Postal Service laws and regulations in the mailing of hazardous material. Anyone who mails, or causes to be mailed, a nonmailable or improperly packaged hazardous material can be subject to legal penalties (i.e., fines and/or imprisonment), including but not limited to, those specified in 18 U.S.C. The transport of hazardous materials prior to entry as U.S. Mail and after receipt from the Postal Service is subject to DOT regulations.