Denver

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With the Colorado state capitol building visible in the background, partygoers dance to live music and smoke pot on the first of two days at the annual 4/20 marijuana festival 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)

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Party goers dance at the annual 4/20 marijuana festival near downtown Denver at Civic Center Park, Saturday, April 19, 2014. The two-day festival, which is expected to draw tens of thousands of people, features music, vendors and speakers in Civic Center Park in front of the state capitol building. (AP Photo/Brennan Linsley)

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With the Colorado state capitol building visible in the background, partygoers dance to live music and smoke pot on the first of two days at the annual 4/20 marijuana festival 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)

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CORRECTS TO 4/20 MARIJUANA FESTIVAL -Police officers mounted on bikes patrol Civic Center Park on the first of two days at the 4/20 marijuana 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)

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** FILE ** With the Colorado state capitol building visible in the background, partygoers dance and smoke pot on the first of two days at the annual 4/20 marijuana festival 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)