Police officers mounted on bikes patrol Civic Center Park on the first of two days at the 420 Cannabis Culture Music Festival at Civic Center Park in Denver, Saturday April 19, 2014. The annual event ... more 
Police officers mounted on bikes patrol Civic Center Park on the first of two days at the 420 Cannabis Culture Music Festival at Civic Center Park in Denver, Saturday April 19, 2014. The annual event is the first 420 marijuana celebration since retail marijuana stores began selling in January 2014. (AP Photo/Brennan Linsley) less 
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Associated Press | Photo By Brennan Linsley
Sat, Apr 19, 2014 6:54 PM EDT