How much poppyseed will show on a drug test?

It used to be just a little, but they've worked on that test (by raising the cutoff) to eliminate poppyseed as a usable "false negative." Having said that, so many people believe one poppyseed will cause you to fail a drug test that you'll never find poppyseed anything in the snack bar at a truck stop--food with poppyseed on it doesn't sell there. I guess that's okay; there are other things to eat and poppyseed doesn't have any flavor.