Don't think so, it comes from lab tests of seized pot.
Quote:
The University of Mississippi's Potency Monitoring Project (UMPMC) tested seized marijuana from all 50 states to determine the percentage of THC, the primary psychoactive ingredient in marijuana.
The average potency of all marijuana in the US, according to the UMPMC's Dec. 2008 – Mar. 2009 quarterly report, was 8.52% (5.62% domestic and 9.57% nondomestic).
The highest tested sample had 22.04% THC (domestic) and 27.30% THC (nondomestic). The highest tested sample ever tested between 1975 and 2009 had 33.12% THC (domestic) and 37.20% THC (nondomestic).
For comparison, the national average of marijuana's THC content in 1978 was 1.37%, in 1988 it was 3.59%, in 1998 4.43%, and in 2008 8.49%.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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