Byrne, the deputy commissioner for legal matters, added: "In the city, the detectives, they look at all the cameras. So they walk up and down the block, and they say, 'Mr. Deli Owner, do you have any cameras? Mr. Newsstand Owner, do you have any cameras? Mrs. Nail Parlor Lady, do you have any cameras? Can we look at your videos? Do you have any footage around 3 a.m. last night where four people got shot in the head in front of your store?'"