A student runs toward the police barrier on the Norlin Quad at the University of Colorado in Boulder, Colo., on Friday, April 20, 2012, at 4:20pm. He was run down by police and arrested after crossing... more 
A student runs toward the police barrier on the Norlin Quad at the University of Colorado in Boulder, Colo., on Friday, April 20, 2012, at 4:20pm. He was run down by police and arrested after crossing the barrier. Police blocked off the quad to prevent a 420 marijuana smoke out. (AP Photo/Ed Andrieski) less 
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Associated Press | Photo By Ed Andrieski
Fri, Apr 20, 2012 9:11 PM EDT