The potency of marijuana, measured by the presence of its psychoactive ingredient, THC, has tripled since 1987, according to the latest figures from the Department of Justice's National Drug Intelligence Center.
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The new pot is certainly a superior product to the shake of the old days, but it's nowhere near as strong as some war-on-drug advocates have contended. The old White House drug czar, John Walters, has said publicly that marijuana's THC content has "increased as much as 30 times," which researchers say is not supported by the available evidence.
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