I'm trying to get a job for the first time. I'm filling out an application right now for WinCo FOODS. There is a question that asks, "Can you, after an offer of employment has been made, submit verification of your legal right to work in the U.S.? (Federal Law requires proof of identity and employment authorization for all new hires.)" I have a driver's license to prove identity but how do I prove that I have employment authorization?