California Code, Penal Code - PEN § 1512

(a) In addition to petitions for a writ of mandate, prohibition, or review which the people are authorized to file pursuant to any other statute or pursuant to any court decision, the people may also seek review of an order granting a defendant's motion for severance or discovery by a petition for a writ of mandate or prohibition.

(b) In construing the legislative intent of subdivision (a), no inference shall be drawn from the amendment to Assembly Bill 1052 of the 1989-90 Regular Session  1 of the Legislature which deleted reference to the case of People v. Superior Court, 69 Cal. 2d 491.