"US (CA): "80% of MMJ at conference tested positive for contaminants"

After a recent marijuana conference in San Francisco, a Bay Area laboratory found that 80 percent of marijuana produced by California growers tested positive for mold, fungus, bacteria, pesticides and other harmful solvents. A doctor from the lab said it's common for 20 to 30 percent of samples to contain contaminants, but this was by far a larger percentage than expected. Not only was a greater percentage of marijuana contaminated than normal plants, but it was also contaminated at higher concentrations. The marijuana sample tested positive for 1,000 times the level of concentrations of toxic substances than typically found in food.

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