WILL I PASS THIS DRUG TEST?!?

i took half of a 1000mg pain killer roughly 4 days ago... i didnt take any for a few days before that one... so only one surrounded by about a week and a half or so. i do not take them habitually but i am so worried that i will not pass the test i took today. its the perfect charge and i hope i dont screw it up. the pill was from a bottle i had from some old dental work i have... so i have the bottle its labeled, but expired by 4 months. i get the results in 2-3 days.. oblige!!
Answers:
It depends on the drug you took. Either way, you should not have taken that medicine unless you be in real pain, especially since it have expired.

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