I would have to say I would DEMAND my product be weighed using TROY ounces..now that's a couple of extra sticks per bag eh?

Street lore or not, you need a very good calibrated scale..calibrated by weights and measures to get down to this level of precision..and if LO decides to give your bag a couple of squirts with an atomizer, it's all going to be a moot point anyway.

"Your honor..at the time the evidence was weighed the relative humidity was t 92%..since it's at 58% today, the weight is no longer accurate and we ask that you go with the weight of the material when the evidence was first weighed"