'You Are No Longer Free to Move About the Country'

Radley Balko reports on Homeland Security's unquenchable desire to reach out and touch us -- this time, before we get on trains and buses (h/t Jack Shafer):

It's not difficult to envision the day where anyone wishing to take mass transportation in this country will have to first submit to a government checkpoint, show ID, and answer questions about any excess cash, prescription medication, or any other items in his possession the government deems suspicious. If and when that happens, freedom of movement will essentially be dead. But it won't happen overnight. It'll happen incrementally. And each increment will, when taken in isolation, appear to some to be perfectly reasonable.