this is my sistuation

im thinkin about applying to office depot and i gotta sign a form sayin their allowed to drug test me before they hire me im 125 pounds and have a fast metabolizim(i have no idea if they will infact drug test) i have smoked saterday of last weekend the weekend before that last friday saterday and sunday and i think the week before that i think i would come up clean on a test but the problem is my friend is comming to visit wednsday and were gunna smoke crip i just want some reassurance and possible tips i plan on drinkin water and gateraid and run 2 miles every night will that help? also if anyone has applied to office depot can u comment on if they do test plus it will be conducted by SAMSHA. thanks for reading this