[Strangler Lewis]

I assume you don't want to be randomly stopped and frisked for weapons in the public square.

As for the government not looking into your home, if they're on the street, they can look into your home and listen to what's happening in there. In the war on drugs, fly-overs and various forms of infrared, heat seeking and satellite surveillance have been approved. The reasonable expectation of privacy diminishes as the technology advances and one is able to say that what once was private is actually open to public reception.