North Carolina is the most recent one I've heard about:
Teixeira's story began near Lowe's Motor Speedway on May 14. As recreational vehicles streamed in for race week, revenue investigators were checking fuel tanks of diesel RVs for illegal fuel.
The investigators spotted Teixeira's passing bumper sticker: "Powered by 100% vegetable oil."
"It was like some twist of fate that put me there," he said. "It was like I was asking for them to stop me."