Which statement is true about USPS shipping restrictions for Category A substances?

• A. They can be shipped with proper labeling and packaging
• B. They cannot be shipped via USPS
• C. They can be shipped with a standard postal permit
• D. They require no special handling

Answer: (B)

Category A infectious substances are highly regulated and must be transported under strict international hazmat rules with specialized packaging, labeling, documentation, and endorsement for air transport. The USPS does not accept infectious substances of Category A for mailing, because allowing them would pose significant safety and public health risks and the mail system isn’t equipped to handle such regulated hazardous materials. So, the true statement is that they cannot be shipped via USPS. The other options would imply that USPS permits or relaxes handling requirements, which isn’t the case for Category A materials.