i think you saw the exchange between mayor glais deblasio and jon stewart on the daly show. complex factors many of which have little to do with how police do their jobs. studies have pointed to the effects of the economy the aging population, lots of other things. why -- what makes you comfortable putting a lot of that aside and saying this is to do with cops being afraid to arrest and get involved in what might end up being a shooting of somebody? >> sure that's a good question ali and certainly there's a lot of theories about crime. but i think having been a resident of new york for the last 20 years it's been in my experience dwiflt twix shown that the explanation for new york's record crime drop, is policing, the aspect of it can be changed poverty wasn't reversed, conservatives root cause out of wedlock child-rearing probably didn't go down, it went up but policing changed. that deterred criminals from getting involved in crime. what we are seeing especially in baltimore which is a shining example of this, when arrests are down over 50% the police are really scared to