If that mud flap is on a vehicle used in interstate commerce, the Constitution allows the Federal government to regulate it. Bo and Luke, running around in the General Lee, are not regulated in the size of their mud flaps because they are not engaged in interstate commerce.
I knew you would rise to the bait. I suppose to your way of thinking the power to regulate mudflaps alone is worth 750,000 dead.
And don't forget that bubble bath is sold across state lines too.
One day I hope to be the czar of the Federal Inter-Agency Research, Development, Green Manufacturing, Transportation, Safety and Visioning Task Force regulating interstate bubble bath with an emphasis on emerging under-served communities.