Ok, I have been wondering about the faintness of test strip marks. Does having a fainter mark mean that there is an amount in your system, but not enough to test positive? Or does the faintness probably not matter so long as its there. I know the kits always say that as long as those magic negative lines show up your clean, but Ive never known myself to be totally clean so I could see if it would be less faint. Anyone know?