Former St. Louis police Chief Dan Isom addresses use of force in Ferguson

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ST. LOUIS, MO (KPLR) - Former St. Louis police chief, Dan Isom who is professor of policing and community at University of Missouri-St.Louis.  Christine Buck asks the former police chief if he was taken back by the show of force of in Ferguson a couple of nights ago. When is it okay to train a gun on top of a military vehicle toward the crowd?