Weekend Edition Sunday is traversing Philadelphia during a month-long series to shine a light on what it means to be an American.
Tour guides in Philadelphia say the city's efforts to ensure historical accuracy have gone a league too far. A city law set to take effect this fall requires tour guides to pass a written licensing test or face hefty fines. Similar laws are already on the books in Washington, New Orleans and Charleston, S.C.
But tour guides in Philadelphia are challenging the law in court, saying it violates the First Amendment.
We find out who's ready for the test and who isn't.