A protester wears a jeweled gas mask before marching down a highway in Boulder, Colorado, December 8, 2014. Cities across the United States have seen large protests in recent nights following the failure to indict anyone over the death of the unarmed black father of six, which happened after police put him in a banned chokehold. REUTERS/Rick Wilking (UNITED STATES - Tags: POLITICS CRIME LAW CIVIL UNREST)