Which of the following is not a true statement regarding the commerce clause?
If the federal government establishes safety device regulations for interstate carriers, a state cannot require different devices.
States may not use their tax power for the purpose of discriminating against interstate commerce.
The commerce clause empowers Congress to regulate interstate commerce, but not commerce with foreign nations.
A state cannot refuse to allow an interstate waste collector to conduct business within the state on the grounds that the state already has enough waste collectors.