Workers prepare sample bags of various strains of marijuana at the Botanacare marijuana store ahead of their grand opening on New Year's day in Northglenn, Colorado December 31, 2013. The world's first state-licensed marijuana retailers, catering to Colorado's newly legal recreational market for pot, are stocking their shelves ahead of their January 1, 2014, grand opening that supporters and detractors alike see as a turning point in America's drug culture. REUTERS/Rick Wilking (UNITED STATES - Tags: SOCIETY DRUGS)