CA Gov't Code Section 11415.50

(a)

An agency may provide any appropriate procedure for a decision for which an adjudicative proceeding is not required.

(b)

An adjudicative proceeding is not required for informal factfinding or an informal investigatory hearing, or a decision to initiate or not to initiate an investigation, prosecution, or other proceeding before the agency, another agency, or a court, whether in response to an application for an agency decision or otherwise.