Well, I had bought a test strip kit at a headshop the other week and couldn't figure out how to use the dang thing because I have never used heroin or opiates but no lines showed up anywhere, so I guess it was saying I was dirty for all of them? Anyway, the only ones that should have tested positive would have been the ganja and benzodiazepenes because I have a prescription for ativan, but there were no lines anywhere. I have decided that for the next 10 months I will just be staying away from the ganja..never done time and don't want to start.