All those powers granted to the Attorney General as a head of a department under Article 2 (commencing with Section 11180) of Chapter 2 of Part 1 of Division 3 of Title 2 of the Government Code shall be granted to the district attorney of any county when that district attorney reasonably believes that there may have been a violation of Article 2 (commencing with Section 16720) or Article 3 (commencing with Section 16750) of this chapter, or a violation of Chapter 4 (commencing with Section 17000) of this part, or a violation of Chapter 5 (commencing with Section 17200) of this part, and shall be subject to the provisions of Chapter 20 (commencing with Section 7460) of Division 7 of Title 1 of the Government Code. Any investigations pursuant to these powers shall be conducted in accordance with the procedures set forth in Article 2 (commencing with Section 11180) of Chapter 2 of Part 1 of Division 3 of Title 2 of the Government Code, including all principles relating to immunity from self-incrimination applicable thereto. However, nothing in Section 16758 shall be construed as providing automatic immunity with respect to the subject of a subpoena issued in connection with that investigation. Court orders sought pursuant to this section shall be sought in the superior court of the county where the district attorney seeking the order holds office.