Eugene Volokh wrote an excellent and highly-cited paper on this point, summarized here: http://www2.law.ucla.edu/volokh/slipperymag.pdf http://www2.law.ucla.ed

Eugene Volokh wrote an excellent and highly-cited paper on this point, summarized here: http://www2.law.ucla.edu/volokh/slipperymag.pdf http://www2.law.ucla.edu/volokh/slipperymag.pdf