Portions of the Patriot Act were declared unconstitutional in 2004 See http://www.CNN.com/2004/LAW/01/26/patriot.act.ap/
That's at the federal level. State laws can be declared so also. See http://www.keystonepolitics.com/story/aroundcapitol/expanded-state-hatecrimes-law-declared-unconstitutional
One of the roles of the appeals courts and supreme courts at both the state and federal level is to rule on the constitutionality of a law.
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Judicial Review
That the law doesn't follow the constitution.
It is nullified and becomes unenforceable.
It allowed the Supreme Court to overrule an unconstitutional law.
the supreme court can declare laws unconstitutional