w:Supreme Court of the United States, Braunfeld v. Brown — Opinion of the Court
“ Of course, to hold unassailable all legislation regulating conduct which imposes solely an indirect burden on the observance of religion would be a gross oversimplification. If the purpose or effect of a law is to impede the observance of one or all religions or is to discriminate invidiously between religions, that law is constitutionally invalid even though the burden may be characterized as being only indirect. ”
