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April 21, 2014

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In this Feb. 7, 2014 photo, workers cultivate small clones of a special strain of medical marijuana known as Charlotte's Web, in a remote spot in the mountains west of Colorado Springs, Colo.

Brennan Linsley / AP

In this Feb. 7, 2014 photo, workers cultivate small clones of a special strain of medical marijuana known as Charlotte's Web, in a remote spot in the mountains west of Colorado Springs, Colo.