 In the United States, a person receiving unwanted commercial mail he or she deems pornographic (or otherwise offensive) may obtain a Prohibitory Order, either against all mail from a particular sender, or against all sexually explicit mail, by applying to the United States Postal Service.There are recurring urban legends of snuff movies, in which murders are filmed for pornographic purposes.Despite extensive work to ascertain the truth of these rumors, law enforcement officials have not found any such works.