Does anyone remember the Seinfeld episode when Elaine tested positive for opium on her company's drug test - because she ate poppy-seed bagels? If I remember correctly, Peterman (her boss), when he saw Kramer, thought that he was her supplier.

They started giving drug tests at a lot of companies in the 1980's. I worked with a guy on the night shift, about 20 years ago, who's urine was positive for so many drugs (acid, pot, coke, shrooms, pills, other) that the testing company thought it was a mistake!