In this April 18, 2015 photo, young partygoers listen to music and smoke marijuana during the annual 4/20 marijuana festival, in Denver's downtown Civic Center Park. (AP Photo/Brennan Linsley) ** FILE **
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In this April 18, 2015 photo, young partygoers listen to music and smoke marijuana during the annual 4/20 marijuana festival, in Denver's downtown Civic Center Park. (AP Photo/Brennan Linsley) ** FILE **
