What are the restrictions on shipping certain items through USPS?

The US Postal Service (USPS) imposes certain restrictions on shipping specific items to ensure safety and compliance with federal regulations. These restrictions vary depending on the type of item being shipped. Prohibited items include explosives, flammable materials, firearms, and illegal drugs. Additionally, perishable items such as live animals, frozen food, and plants may have restrictions or require special packaging. Hazardous materials, including corrosive, toxic, or radioactive substances, are strictly regulated and may only be shipped under specific conditions. Other restricted items may include alcohol, cigarettes, and certain prescription medications. It is essential to thoroughly review USPS guidelines and consult with postal staff to ensure compliance when shipping such items, as failure to comply with these restrictions may result in legal consequences or the refusal to ship the item.