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PBS News Hour

How safe is super-concentrated marijuana?

Season 2016 Episode 3500 | 8m 14s

Now legal in eight states, there are unanswered questions about the impact of recreational marijuana on public health. To maximize potency, pot can be purified for maximum THC, its psychoactive ingredient. But a lack of research and restrictions on these very high concentrations is raising concerns. Special correspondent John Ferrugia of Rocky Mountain PBS reports.

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