If I read the papers I got from the state's Dept of Ag, anyone selling eggs on the scale of commercial producers (ok, it only has to be 50 crates or more per year, 1 crate equaling 30 dozen) has to candle every egg before it gets packed and the date/time has to be logged.
(I am SO glad I found the exemption for people selling only the eggs produced by their own flocks!)