If you left your driver's license at home, you are "undocumented:" if you're driving without a license, you're a criminal.
I remember hearing a story about a detective who was asked for spare change by a vagrant.
He showed the guy his badge, and aked him for his ID, and the vagrant said "Er, sorry, I left my wallet on my dresser at home."
The cop said "I've heard that so often, that sometimes I think there's a dresser somewhere in this town with a pile of wallets on it three feet high."
He was wrong: it's in Guadalajara.