Will i pass my drug test if i smoked a very very small amount of marijuana a little over a month ago?

Yes: If this is all you did, then you should be fine. This is not the place to talk about the wisdom of the marijuana laws; one unfortunate fact is that since marijuana stays around longer than drugs that are far more dangerous, drug-testing leads partiers to use the more dangerous drugs out of fear of detection. Glad you're not using more or anything else.

Test clean...: If you are still concerned, google this website. They purvey products that address this very issue , and you may want to take extra precautions depending on what your testing involves.