lapd officer and now a prompt of criminology and criminal justice at st. louis university and president of the national organization of black law enforcement executives is with me and on president obama's 21st century policing task force. gentlemen, to you both thanks for being here. david, start with you. lots of cities with similar problems. is there a root cause to all of this? >> don't know for sure, but one thing that several people have argued the last several weeks, particularly in the wake of what happened in baltimore is de-policing. police officers starting to pull back and not appropriately being aggressive. when i say that stopping and questioning people when in fact they have reasonable suspicion, patting them down reasonable suspicion, so on and so forth. if officers are merely responding to radio runs not stepping out talking to people who may be armed with a firearm and up to no good, they're free to prey on the innocent people