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Legalizing marijuana and the new science of weed


More than a year into Colorado’s experiment legalizing marijuana, labs testing the plants are able for the first time to take stock of the drug’s potency and contaminants – and openly paint a picture of what’s in today’s weed. Now, one such lab will present trends — and some surprises — that its preliminary testing has revealed about the marijuana now on the market. Scientists are studying potency, amounts of a substance called CBD and contaminants in the products.


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