A subpoena must be issued from the court where the case is pending (by an attorney who is authorized to practice in the court where the case is pending [including one appearing pro hac vice], or by the clerk, who may issue a subpoena to a party requesting it in blank, who must fill it out before service). It may be served anywhere in the United States, and it must command that the deposition, production, or inspection take place within 100 miles (or in limited instances within the state) where the person resides, is employed, or regularly transacts business in person.