the "C" is the control line and must appear to indicate the test is working properly, the "T" line is the test line and if a line appears (maybe faint) it usually indicates a negative. THe "s" line is where you place your sample. To pass, i bought some permanent cleansing pills for $120 incl. shipping, it is a strict diet, no alcohol, and you get MAD diarrhea (lipidy substance which thc sticks to). its a 5 day progr. but takes about 7 days to complete. If 200+ lbs. maybe longer. But you will be clean until you use again, and you cant use 48 hrs prior to beginning progr. and while on progr.