"Do cops cover up for other cops?"Chris Hayes posed this question to Steve Osborne, a 20-year veteran of the NYPD, on last night's edition of MSNBC's "All In with Chris Hayes," during a discussion of the police killing of Samuel DuBose, the 43-year-old black man shot in the head by a University of Cincinnati police officer during a routine traffic stop earlier this month.Hayes questioned the actions of two other University of Cincinnati police officers, Philip Kidd and David Lindensmith, who were at the scene and have since been put on paid administrative leave after police body cameras showed that the police officer who shot DuBose, Ray Tensing, had not been dragged by DuBose's car before the shooting as he had initial claimed.