Replying to Drug Test

Ok i know these have been on before but i really need your help. Tomorrow (10/17) morning at 6 a.m. i have to go in for operation to pin by collarbone. For some fucked up reason (i dont know why) they want a piss sample to test for drugs. For the most part i havent smoked for 2 weeks except for maybe 3 hits from a blunt last week wednesday. I need to pass this test. My friend suggested cranberry juice and 2 shots of vinigar. are there any other suggestions as to how i can pass this test? i dont think i can take detox either b/c he said they test for that at a hospitol. Please help a friend out
-jason-

freedom, tolerance, love and peace