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I think that stop and frisk would have to be used very carefully otherwise it leads to racial profiling real fast.

When I did police work, if there was a high crime area, they would establish a zero tolerance zone and everyone would be writing tickets for everything including the minor stuff. Naturally the criminals break laws right and left so they get rounded up pretty quickly. If someone had warrants out for their arrest they would get caught pretty quickly in these zones. Anyway that seemed to work pretty well without affecting other areas. But we didn't have this modern lack of respect for the authorities though. Today the people in some cities just do not respect anyone with authority, so maybe it won't work today.

I remember them setting up checkpoints for drunk drivers. They checked everyone. Otherwise it was a illegal checkpoint. But we would have some guys park back a ways from the checkpoint. They would go after the ones who saw the checkpoint and turned around trying to avoid it. Invariably those U turn folks were the ones that you really wanted to catch.