Atomic Hemorrhoid

I'm sure this has come up before but i couldnt find any discussion on it..:

We've heard of the pitfalls of poppy-seed muffins making people fail the urine test.

Help-enriched foods are everywhere. And yes they DO contain trace amounts of THC.

Therefore, when the sensitivity of something like a hair test comes onto the scene, how likely is it that someone who perhaps eats something such as "Nature's Path Organic Hemp Plus Granola" sometimes every day for breakfast but doesnt otherwise consume any Marijuana at all (no urban legend, i actually do know someone who actually fits that bill), how likely is it for them to fail such a 'drug' test?

what a drag it would be: innocent! but 'proven' guilty!!