California Code, Penal Code - PEN § 627.6

At each entrance to the school grounds of every public school at which this chapter is in force, signs shall be posted specifying the hours during which registration is required pursuant to Section 627.2, stating where the office of the principal or designee is located and what route to take to that office, and setting forth the applicable requirements of Section 627.2 and the penalties for violation of this chapter.