Donald Trump has indicated he'd favor making so-called "stop and frisk" policing a national phenomenon. This is also referred to as "broken windows" policing - cracking down on minor offenses as a way of discouraging major offenses. Looking for concealed weapons on loitering young men (and women).
If you needed another reason to vote for Trump, this could be it. When Giuliani pushed this approach in NYC the crime rate for major crimes - murder, arson, assault - dropped dramatically. It has worked elsewhere too, but is unpopular with police-resenting civil rights advocates. As we know, Giuliani is advising Trump, perhaps might end up as Trump's Attorney General.