Final answer:
Drivers, shippers, and carriers refer to the United States Department of Transportation and the Environmental Protection Agency's regulations to determine if a material is regulated.
Step-by-step explanation:
Drivers, shippers, and carriers use the United States Department of Transportation hazardous materials regulations to determine if a material is regulated. In addition to DOT regulations, the Environmental Protection Agency's (EPA) hazardous waste regulations must also be consulted. These regulations are crucial for ensuring the safe and legal transportation of materials, as they dictate the handling, packaging, and documentation required. For example, when it comes to transporting goods across borders, customs officers may use scanning devices such as gamma ray, x-ray, or neutron-scanning devices to inspect vehicles and verify that the goods being transported comply with the relevant regulations.