A bill proposed in the Missouri of House of Representatives would seek to limit the way local police departments can respond to protests — stopping them both from declaring unlawful assemblies or using chemical agents unless certain conditions are met. State Representative Bruce Franks (D-St. Louis) calls it the "Protesters' Bill of Rights."Franks, of course, is no stranger to the protest lines: He was there in Ferguson following the shooting of Michael Brown and, this fall, has led the demonstrations that have followed a police officer's acquittal on murder charges.…