Forensic material containing a biological material, such as tissue, body fluid, excreta, or secreta, and sent on behalf of a federal, state, local, or Indian tribal government agency must be packaged under 346.325 when it is not known or suspected to contain a Category A or Category B infectious substance. Forensic material known or suspected to contain a Category A infectious substance is not mailable. Forensic material known or suspected to contain a Category B infectious substance as identified in 346.321 is mailable with Priority Mail Express, Priority Mail, First-Class Mail, or First-Class Package Service, when triple-packaged in a primary receptacle, secondary container, and a rigid outer shipping container.
The secondary container must be firmly and snugly packed within a strong outer shipping container that is securely sealed. The secondary container must also display the international biohazard symbol shown in Exhibit 346.321.