Marchers Arrested in Colo. University's Pot Crackdown

A block-long line of protesters marched over the school's attempt to push the "4:20" celebration off campus.

FILE - In this April 20, 2009 file photo thousands of people fill Norlin Quad during the annual "420" event at the University of Colorado in Boulder, Colo. The University of Colorado is closing its campus to outsiders on Friday, April 20, 2012 and closing the Norlin Quad to prevent a 420 gathering. For years, the term "420" was a kind of code. But the term, and the holiday, have become more mainstream as more attention has been focused on marijuana issues. (AP Photo/The Daily Camera, Mark Leffingwell)

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