The truth about THC percentages?

Great thread that deserves a bump.

Has anyone come up with a final definitive answer? How are thc/cbd/etc percentages calculated? Has the industry become more standardized as to testing? I mean I know even the good kind bud from back home cant literally weigh 250 mgs of thc (25% thc) to a gram even when conpletely dry. Considering marinol (synthetic thc prescription) comes in doses of 5 and 10 mg I think.
 
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