At his doctor's recommendation, Casias says he legally uses medical marijuana to ease his pain.Walmart fires medical marijuana patient for using medical marijuana (Thanks, Jason!)
"It helps tremendously," he says. "I only use it to stop the pain. To make me feel more comfortable and active as a person."
During his five years at WalMart, Casias says he went to work every day, determined to be the best.
"I gave them everything," he says. "110 percent every day. Anything they asked me to do I did. More than they asked me to do. 12 to 14 hours a day."
But last November, Casias sprained his knee at work. Marijuana was detected in his system during the routine drug screening that follows all workplace injuries. Casias showed WalMart managers his state medical marijuana card, but he was fired anyway.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.