Kingfish writes:

Old urban myth. You'd have to eat many bagels (or just scarf down a
few handfuls of seeds) to test positive.

Unfortunately, it's no myth. People have been fired and denied jobs because
of a positive drug test that resulted from eating poppy seeds. Sometimes just
one bagel with poppy seeds can do it. See

http://www.snopes.com/medical/drugs/poppyseed.asp

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