goes, it increases fear and withdrawal from residents or members of a community and makes it more likely serious crime will occur. this theory dates back several decades. new scrutiny raises serious questions. mark clakston, a retired detective serves as director of black law enforcement alliance is with us. and former federal prosecutor and msnbc legal analyst. thanks to you both. i thought given what the police chief in new york, kplpolice commissioner said about the place he was apprehended was a high crime area where there were a lot of concerns from residents about increased police presence and stopping some things going on. a number of people said why was this guy stopped for selling loose cigarettes. aren't there more serious things going on. they were saying lots of serious things went on in that park. part of it was coming down on not serious things so more serious things don't happen.