St. Louis police officers on trial for beating Black undercover detective during protest

St. Louis police officers on trial for beating Black undercover detective during protest, Ha Ha beat up wrong blackcop beatup for a protester, so cops can beat peaceful protesters, St. Louis police detective Luther Hall was brutally beaten while working undercover at a protest against police brutality in September 2017. Now three fellow officers are on trial for the assault, which they claim was a case of mistaken identify. One of the officers already pleaded guilty and admitted to lying on the stand. Lauren Trager, an investigative reporter with CBS affiliate KMOV-TV, joins CBSN AM's Anne-Marie Green to discuss the case.