Nothing will ever replace good old fashioned police work, but Facebook and Twitter have been like a tool on our belt, In some ways it can help them in their investigations and in some ways it can hinder

They really do feel under attack, rank-and-file officers and much of American police leadership, that they feel they're under attack from the federal government at the highest levels. So that's something we need to understand also, this sense of perception that becomes a reality.

We are increasingly blind for terrorism purposes and for general law enforcement purposes with the new devices and the continuing effort to make them even more secure against even court orders authorising law enforcement to have access.

I think that's the direction we [the americans] are going to have to go, the idea of people understanding that if you see something, say something, as simple as it sounds.

I'm sorry, but any police department in America that tries to function without some form of 'stop and frisk,' or whatever terminology they use, is doomed to failure. It's that simple.