Section 904 Of Article 4. Impaneling Of Grand Jury From California Penal Code >> Title 4. >> Part 2. >> Chapter 2. >> Article 4.

. Every superior court, whenever in its opinion the public interest so requires, shall make and file with the jury commissioner an order directing a grand jury to be drawn. The order shall designate the number of grand jurors to be drawn, which may not be less than 29 nor more than 40 in counties having a population exceeding four million and not less than 25 nor more than 30 in other counties.