Final answer:
Hazardous materials are substances that pose health and safety risks during transport and are regulated by the United States Department of Transportation and the EPA's hazardous waste regulations. These materials include contaminants, pathogens, and carcinogens, and must be handled according to specific safety regulations.
Step-by-step explanation:
The substance or material referred to in the question that poses an unreasonable risk to health, safety, and property when transported in commerce is known as hazardous material. These materials are regulated by the United States Department of Transportation under specific hazardous materials regulations, and their management may also fall under the Environmental Protection Agency's (EPA) hazardous waste regulations as described by the Resource Recovery and Conservation Act (RCRA).
Hazardous materials can include various substances such as contaminants that harm the environment, pathogens or their vectors which can lead to the spread of disease, and carcinogens which can cause cancer. Transporting these materials requires compliance with safety regulations to prevent accidents and protect public health. Failure to comply with these rules during the importation or transportation within the United States, particularly regarding substances like intoxicating liquors, is prohibited according to the laws of the respective states or territories.