At the start of the movie Man on a Ledge, Nick Cassidy goes to some lengths to make it hard for the police to discover his identity by using a false credit card and wiping his prints from the hotel room before he gets onto the ledge.
But some of the policemen at the scene have previous involvement with Englander, the character Cassidy is very publicly accused of stealing from.
So how come they didn't recognize him sooner?

how come they didn't recognise him sooner? You said this is at the start of the movie, how come it is expected for the policemen to have identified him sooner? – Mistu4u Feb 11 at 3:43