“To regulate Commerce with foreign Nations, and among the several states, and with the Indian Tribes.”

Currently there are 73 federal agencies that have full-time armed officers with arresting authority. According to a 2008 report by the Department of Justice, there were 120,000 full-time law enforcement officers working for federal agencies and 24 different federal agencies employed at least 250 full-time officers. Federal agencies with at least 250 full-time officers included the U.S. Forest Service, U.S. Mint, U.S. Postal Inspection Service and the Veterans Health Administration.

We have too long abrogated our duty to enforce the separation of powers required by our Constitution. We have overseen and sanctioned the growth of an administrative system that concentrates the power to make laws and the power to enforce them in the hands of a vast and unaccountable administrative apparatus that finds no comfortable home in our constitutional structure. The end result may be trains that run on time (although I doubt it), but the cost is to our Constitution and the individual liberty it protects. – Justice Clarence Thomas from his concurring opinion in Dep’t of Transportation v. Ass’n of American Railroads

In a New York Times Op-Ed, Louis Michael Seidman, a professor of constitutional law at Georgetown, states that it may be time to give up our "obsession with the Constitution":