The Mayor of the City of New York has absolutely NOTHING to do with NYPD Stop Question and Frisk procedures.
They have been in place without change since at LEAST 1982 when I first learned them in the Police Academy.
So your hatred of Bloomberg has no bearing on the topic at hand. These procedures were written to ensure full compliance with the Constitution as interpreted by the Supreme Court. Whether you agree with the arrest rate or not is moot. There are a variety of reasons why stops are legally conducted that do not result in arrests, and they are all quite proper within the boundaries of current statute.
Therefore, again, I suggest you take it up with them.
"Certainly there is no hunting like the hunting of man and those who have hunted armed men long enough and liked it, never really care for anything else thereafter." Ernest Hemingway