Well if it's accurate (that Jack3d tests + for meth) then you can take a tablespoon of baking soda, ball it up in a layer of toilet paper, dip it in ur mouth and swallow it (called balooning) then chase it down with a glass of warm water mixed with another tablespoon baking soda, making it two tablespoons of baking soda total right before your piss test (like morning of or the night before, but then don't take jack3d after you take the baking soda prior to UA) and that should take care of any false +.... works for crystal meth, so my assumption is it would work for Jack3d if it tests + for the same metabolites, you can also do two tablespoons soda in water and drink it, but it tastes like dookie, so baloon one and drink one down, may taste like crap but bound to save ur job

Plus baking soda's good for you ^_^