When John Gilmore arrived at the Southwest Airlines counter for his flight to Washington he presented his ticket to the gate agent. The agent asked for John's ID. When asked why the ID was necessary the agent replied: It is the law.
When John asked if he could see this law no-one could produce a copy of it. "Are they just basically saying we just can't travel without identity papers?" asks Gilmore who used to work for Sun Microsystems and is worth 30 million.
John has started an argument which could turn homeland security upside-down. John cannot fly inside the US, hire a car, or rent a room at most hotels. He even has trouble entering the courthouse where his case is being heard because he will not show ID. Source