42 U.S.C. § 2000bb-1 : US Code - Section 2000BB-1: Free exercise of religion protected

    (a) In general
      Government shall not substantially burden a person's exercise of
    religion even if the burden results from a rule of general
    applicability, except as provided in subsection (b) of this
    section.
    (b) Exception
      Government may substantially burden a person's exercise of
    religion only if it demonstrates that application of the burden to
    the person - 
        (1) is in furtherance of a compelling governmental interest;
      and
        (2) is the least restrictive means of furthering that
      compelling governmental interest.
    (c) Judicial relief
      A person whose religious exercise has been burdened in violation
    of this section may assert that violation as a claim or defense in
    a judicial proceeding and obtain appropriate relief against a
    government. Standing to assert a claim or defense under this
    section shall be governed by the general rules of standing under
    article III of the Constitution.