[inquest]

Sorry, if I'm selling hot dogs outside my front porch, and some guy from halfway across the country decides to buy one, I'm not engaging in "interstate commerce".

[spunkets]

Once it crosses Stste lines you are. Hence the FDA. That's the dept. that regulates drugs, food, services, devices, ect...
All by the authority and power established and given to Congress by the commerce clause contained within the body of the Constitution. Congress does indeed regulate hot dog production and sales.