California Code, Penal Code - PEN § 999t

(a) An individual may be the subject of a child abuser prosecution effort who is under arrest for the sexual assault of a child, as defined in Section 11165, or a violation of subdivision (a) or (b) of Section 273a, or a violation of Section 273ab, or 273d, or a violation of Section 288.2 when committed in conjunction with any other violation listed in this subdivision.

(b) In applying the child abuser selection criteria set forth above:  (1) a district attorney may elect to limit child abuser prosecution efforts to persons arrested for any one or more of the offenses described in subdivision (a) if crime statistics demonstrate that the incidence of such one or more offenses presents a particularly serious problem in the county;  (2) a district attorney shall not reject cases for filing exclusively on the basis that there is a family or personal relationship between the victim and the alleged offender.

(c) In exercising the prosecutorial discretion granted by Section 999v, the district attorney shall consider the character, the background, and the prior criminal background of the defendant.