42 U.S.C. § 2000cc-1 : US Code - Section 2000CC-1: Protection of religious exercise of institutionalized persons

    (a) General rule
      No government shall impose a substantial burden on the religious
    exercise of a person residing in or confined to an institution, as
    defined in section 1997 of this title, even if the burden results
    from a rule of general applicability, unless the government
    demonstrates that imposition of the burden on that person - 
        (1) is in furtherance of a compelling governmental interest;
        (2) is the least restrictive means of furthering that
      compelling governmental interest.
    (b) Scope of application
      This section applies in any case in which - 
        (1) the substantial burden is imposed in a program or activity
      that receives Federal financial assistance; or
        (2) the substantial burden affects, or removal of that
      substantial burden would affect, commerce with foreign nations,
      among the several States, or with Indian tribes.