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How can you test pos. one day and the next day neg. and you did not smoke?

Posted by grama52

My daugther is testing every day and one day they said that she had a neg. one day and the very next day they said she was pos. then the next day a neg.. How can this be and is it possiable for this to happen? I just want to know if she is doing weed are is there something wrong with the test itself.
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