I have to take them periodically, because my ex is a druggie and the courts always make me take one too. And they, told me that. It is a little thing they stick in it. Like a swizzle stick sort of. But it is instant. But now these same people told me that cocaine was detectable in the urine for up to 6 weeks. (thats her drug) I have never found any research to back this up.
But the tech at my dr office (they do them too) said the same thing, about it being 6 weeks. Crazy huh.