(a)
The process by which the attendance of a witness before a court or magistrate is required is a subpoena. It may be signed and issued by any of the following:
(1)
A magistrate before whom a complaint is laid or his or her clerk, the district attorney or his or her investigator, or the public defender or his or her investigator, for witnesses in the state.
(2)
The district attorney, his or her investigator, or, upon request of the grand jury, any judge of the superior court, for witnesses in the state, in support of an indictment or information, to appear before the court in which it is to be tried.
(3)
The district attorney or his or her investigator, the public defender or his or her investigator, or the clerk of the court in which a criminal action is to be tried. The clerk shall, at any time, upon application of the defendant, and without charge, issue as many blank subpoenas, subscribed by him or her, for witnesses in the state, as the defendant may require.
(4)
The attorney of record for the defendant.
(b)
A subpoena issued in a criminal action that commands the custodian of records or other qualified witness of a business to produce books, papers, documents, or records shall direct that those items be delivered by the custodian or qualified witness in the manner specified in subdivision (b) of Section 1560 of the Evidence Code. Subdivision (e) of Section 1560 of the Evidence Code shall not apply to criminal cases.
(c)
In a criminal action, no party, or attorney or representative of a party, may issue a subpoena commanding the custodian of records or other qualified witness of a business to provide books, papers, documents, or records, or copies thereof, relating to a person or entity other than the subpoenaed person or entity in any manner other than that specified in subdivision (b) of Section 1560 of the Evidence Code. When a defendant has issued a subpoena to a person or entity that is not a party for the production of books, papers, documents, or records, or copies thereof, the court may order an in camera hearing to determine whether or not the defense is entitled to receive the documents. The court may not order the documents disclosed to the prosecution except as required by Section 1054.3.
(d)
This section shall not be construed to prohibit obtaining books, papers, documents, or records with the consent of the person to whom the books, papers, documents, or records relate.