I have used strip nc over 50 times I used to take ua's twice a week and at the time I was smoking herb up until 10pm the night before my tests and shooting heroin up until like a day or 2 before I took the tests I tried to stay off the smack for 2 days but didnt always work anyways I passed for opiates 99% of the time regardless. Strip nc is a great cleanser and recommend it to anyone who puffs but as far as xanax I am unsure. I don't know what kind of opiates you are taking or who you are pissing for but if it is a 5 panel test and you are only snorting oxycontin then you are fine because the 5 panel tests they test for opiates but there test only detects morphine which is what heroin,codiene,vicodin and obviously morphine breaks down into but oxy's break down into something similar and they have to test specifically for oxycodone to detect oxycontin in your system this I am 150% sure of. Hope this helps good luck as far as the strip nc if you are puffing herb bro I puffed headies all day long up till the night before and never failed but from time to time opiates would show up I was smart since it was for parole and I investedd the extra few bucks to buy my own home test to make sure I was completly clean before going in. But honestly I put that lifestyle behind me and am glad it gets old swearting that stuff but to each is own I hope my info helps
