Detroit police and city officials are drafting an ordinance that would make it mandatory for all venues that serve customers after 10 p.m. to join Project Green Light, a program that allows officers to monitor businesses’ high-definition video feeds in real time. All businesses open that late —from party stores and gas stations to sports stadiums like Comerica Park and venues like the Fox Theatre— would be subject to the ordinance if it’s passed, police said. Police report double-digit reductions in violent crime at businesses that have enrolled in Project Green Light.