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In this photo taken on Saturday, Feb. 9, 2013, Ian Banister looks at chemicals for growing plants as they are passed around the classroom at THC University in the Tivoli in Denver. (AP Photo/Ed Andrieski)

Associated Press
In this photo taken on Saturday, Feb. 9, 2013, Ian Banister looks at chemicals for growing plants as they are passed around the classroom at THC University in the Tivoli in Denver.   (AP Photo/Ed Andrieski)
In this photo taken on Saturday, Feb. 9, 2013, Ian Banister looks at chemicals for growing plants as they are passed around the classroom at THC University in the Tivoli in Denver. (AP Photo/Ed Andrieski)
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