What are the mailing requirements for controlled substances via USPS?

The correct choice pertains to the specific regulations set forth for mailing controlled substances via the United States Postal Service (USPS). According to these regulations, the inner container holding the controlled substance must be marked and sealed securely to ensure that the contents are not identifiable from the outside, which is critical for security and compliance purposes.

This means that while the inner packaging may indicate what is contained within it, it should not be apparent from external examination. Additionally, the outer container, which provides another layer of security, must be plain and devoid of any markings or logos that could imply the presence of controlled substances. This requirement helps to minimize the risk of theft and ensures that packages are not tampered with or targeted by individuals who may seek to misuse their contents.

In contrast, the other options do not align with the regulatory requirements for mailing controlled substances. For example, clear packaging or labeling the package as containing controlled substances would both defeat the purpose of maintaining security and confidentiality of the shipment. Similarly, using an outer package marked with a pharmacy's logo could attract unnecessary attention and pose security risks. Therefore, ensuring that the inner container is properly marked and sealed, while the outer packaging remains plain, is essential to comply with the law regarding the mailing of controlled substances