how do the cops test bud on the side of the road? my friend said they put it in this liquid and told her it was good ****.. but how does it work also what kinda THC percentages are goin around nowadays? i have no way of gauging whether im spokin 10% or 20% bud. i could be missin out on some incredible bud and not even know it... how do you test for the THC percentage? and whats the CBD ratio and how is that computed? thanks all ..