I passed a drug a drug test earlier today but failed one just now?

i have an important drug test for maurijuana coming up and earlier today i took a drug test and passed but now i took one and failed. it’s been a little over two weeks since i smoked. i’m a 5’9 male 145 lbs and i’ve been able to get weed out of my system in 10 days before(w a lot of water) i just went and worked... show more i have an important drug test for maurijuana coming up and earlier today i took a drug test and passed but now i took one and failed. it’s been a little over two weeks since i smoked. i’m a 5’9 male 145 lbs and i’ve been able to get weed out of my system in 10 days before(w a lot of water) i just went and worked out and got a nice sweat in so why am i failing my test now?
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