writes:

Why be concerned with a drug screen? The two main reasons why people
might worry about a drug screen a
1) An idiot who is using illegal drugs which will prevent him/her from
being a good pilot
2) An idiot's attempt to hide a serious medical condition that would
impair his/her ability to fly

Eating bagels made with poppy seeds can give you a positive drug test, even
though you've taken no drugs. For that matter, taking aspirin or vitamin C
before the test can make it look positive for glucose, too.

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