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The Federal Bureau of Investigation (FBI) is not one of the main US regulatory agencies focused on hazardous materials. The FBI’s primary functions involve investigating and enforcing federal laws related to criminal activities, national security, and intelligence. In contrast, the other agencies mentioned have specific mandates related to the regulation of hazardous materials:

- The Environmental Protection Agency (EPA) oversees the environmental aspects of hazardous materials, ensuring that they are managed in a way that protects human health and the environment.

- The Nuclear Regulatory Commission (NRC) focuses on the regulation of nuclear energy and materials, ensuring safe usage and handling to protect public health and safety.

- The Occupational Safety and Health Administration (OSHA) is responsible for ensuring workplace safety related to hazardous materials, setting and enforcing standards to protect workers from exposure to harmful substances.

Thus, the FBI does not fall under the category of regulatory bodies that manage hazardous materials, making it the correct choice in this context.