Doesn't that go against the whole guilty until proven innocent thing?
People often joke that "America has the worst form of government on the planet except for all the others." It ain't perfect.
There's a "stop and frisk" law in New York now. Basically if you look suspicious they can just stop you and search your person. That seems incredibly un-American to me (an American) yet it exists, seemingly in direct contradiction to "innocent until proven guilty" and the search laws we already have on the books.
False, "looking suspicious" isn't enough legally:
http://law.onecle.com/new-york/criminal-procedure/CPL0140.50_140.50.htmla police officer may stop a person in a public place located within the geographical area of such officer's employment when he
reasonably suspects that such person is committing, has committed or is about to commit either (a) a felony or (b) a misdemeanor defined in the penal law, and may demand of him his name, address and an explanation of his conduct.