Final answer:
The exception for certification of hazardous materials' packaging per regulations is if the material is an unused commercial chemical product.
Step-by-step explanation:
The correct answer is option: The exception to the requirement that shippers certify that hazardous materials are packaged according to regulations is that the materials must be an unused commercial chemical product.
The United States Department of Transportation and the Environmental Protection Agency (EPA)'s hazardous waste regulations require this certification to ensure the safe transportation of hazardous materials on public roads, highways, rails, and waterways.
However, when the chemical in the waste is unused and in the form of a commercial chemical product, this certification may not be necessary.
The correct answer is option: When the hazardous materials are offered for domestic transportation by aircraft
Under the United States Department of Transportation hazardous materials regulations, shippers are required to certify that the packaging of hazardous materials is done according to the regulations. However, there is an exception to this certification requirement. Shippers do not need to certify when the hazardous materials are offered for domestic transportation by aircraft.
To summarize, the shippers must certify that hazardous materials are packaged according to regulations, but the exception to this requirement is when the hazardous materials are offered for domestic transportation by aircraft.