Helllllp! What can I use for a random drug test that's fast and handy and 100% gaurenteed?

What could I use if I had a random drug test and could mix it up instant and it's 100% gaurenteed? I'm in nursing school and adderal helps me focus with the amount of test we have every week. My school is 3-10pm mon-fri and I totally plan on stopping right when I become a LPN but I just don't wanna fail... show more What could I use if I had a random drug test and could mix it up instant and it's 100% gaurenteed? I'm in nursing school and adderal helps me focus with the amount of test we have every week. My school is 3-10pm mon-fri and I totally plan on stopping right when I become a LPN but I just don't wanna fail for them because other then those for school I don't do any drugs.
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