When you press rosin a lot of the oils are still stuck in the pot you just pressed tho. When they test in the lab they use solvents to remove all the oils form the pot then measure the percentage of the various cannabinoids in the oil recovered.
I spent about an hour just now trying to find out if the %THC or other cannabinoids relates to how much in dry plant material or the % of each in the total amount of oil extracted from a specific amount of dried material. All sorts of stuff about preparing samples for testing with various methods and how much sample to use but nothing about how the percentage rating relates to what you ingest.
I've come to the conclusion that it must be relative to the total amount of oil extracted but I still don't know for certain and I do like to have the facts before stating I know what I'm talking about. I have been accused of being wrong before.
This is why I came to the conclusion I did. If it was the percent relative to the dry material, pot that is rated 20%THC would have 200mg of THC in a single fat joint and would put all but the most chronic of tokers in orbit. Or a rubber room for a few days.
200mg of THC in an edible might make you the first cannabis fatality ever. Here, try this. It'll make ya famous.
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If anyone knows for sure and has a link or two to the info too, (had to do that last too.
), I'd sure like to see it.