So I'm reading a college pharmacy book and it says that theres 30 grams in an ounce, the herb has taught me that there is 28 grams in an ounce, and college chem + google search says 28.34.... So can anyone provide insight as to this problem? Are dealers ripping you off if you buy an ounce and your not getting 30 grams? Or is the pharmacy book just rounding it to 30 (seems unlikely as one would think that when filling orders for prescriptions the correct dosage would be absolutely necessary). And why would a google search say 28.34... Whose lying: the herb, google or pharmacy?