You also have to give some consideration to the idea that when these guys get caught, its probably for a reason. Nobody is going to storm in my house to find a bag of personal use weed. Its quite likely that a significant amount of your 99% cases involve a tipoff or a lead the cops are following that more than personal use is going on. Take our former linebacker Beckett. Dude gets caught with weed...and a scale. I'm guessing the police had some intel and I doubt that scale was for weighing his meal portions. Whether he had a little or alot of weed is probably a function of point in time inventory. Common sense has to apply at some point.