We need federally enacted Stop and Frisk laws. That and take 2nd Amendment right away from black men. Idiots pull gun on a cop and the survivors wonder why he was gunned down.
Stop & Frisk would be a good policy if it were stipulated that arrest could follow only in the discovery of guns or other lethal weapons -- nothing else. The problem with the policy in New York City was the vast majority of Stop & Frisk arrests were for drugs or paraphernalia, mostly marijuana in very small amounts, pipes, rolling papers, etc.
Had the New York City example been restricted to only weapons arrests I am sure it would have remained in effect. As it was the volume of bullshit drug arrests were a costly waste of time which served to generate a lot of anti-cop hostility and sufficient public protest to declare the practice unconstitutional -- which it actually is.