When can police use force on peaceful protestors?

When can police use force on peaceful protestors? If someone is protesting peacefully, why are they held responsible for the actions of a violent protestor? We asked police law expert Professor Rachel Harmon to discuss why and under what circumstances law enforcement officers can disperse or arrest non-violent protesters under unlawful assembly or riot laws. Rachel Harmon is a professor of law and the Director for the Center for Criminal Justice at the University of Virginia School of Law. ► http://www.talksonlaw.com for more legal explainers and interviews with the titans of law. ► Facebook: http://www.facebook.com/talksonlaw ► Instagram: http://www.instagram.com/talksonlaw ► Twitter: http://www.twitter.com/talksonlaw ► TalksOnLaw does not provide legal advice. Learn more here: https://www.talksonlaw.com/briefs#about_tol_briefs_tol_is_not_your_lawyer ____________________