USPS® is committed to keeping your mail safe. Log on and see if the item you wish to mail is permitted and learn more about how to prepare this type of mail safely.
WARNING: Persons who knowingly mail items or materials that are dangerous or injurious to life, health, or property in violation of 39 U.S.C. 3018 may be liable for a civil penalty of at least $250, but not more than $100,000 for each violation; the costs of any cleanup associated with each violation; and damages.