Pen. Code, § 653b

(a) Except as provided in subdivision (b) or (c), every person who loiters about any school or public place at or near which children attend or normally congregate and who remains at any school or public place at or near which children attend or normally congregate, or who reenters or comes upon a school or place within 72 hours, after being asked to leave by the chief administrative official of that school or, in the absence of the chief administrative official, the person acting as the chief administrative official, or by a member of the security patrol of the school district who has been given authorization, in writing, by the chief administrative official of that school to act as his or her agent in performing this duty, or a city police officer, or sheriff or deputy sheriff, or Department of the California Highway Patrol peace officer is a vagrant, and is punishable by a fine of not exceeding one thousand dollars ($1,000) or by imprisonment in a county jail for a period not exceeding six months, or by both that fine and imprisonment.

(b) Every person required to register as a sex offender who violates subdivision (a) shall be punished as follows:

(1) Upon a first conviction, by a fine not exceeding two thousand dollars ($2,000), by imprisonment in a county jail for a period of not more than six months, or by both that fine and imprisonment.

(2) If the defendant has been previously convicted once of a violation of this section or former Section 653g, by imprisonment in a county jail for a period of not less than 10 days or more than six months, or by both imprisonment and a fine of not exceeding two thousand dollars ($2,000), and shall not be released on probation, parole, or any other basis until he or she has served at least 10 days.

(3) If the defendant has been previously convicted two or more times of a violation of this section or former Section 653g, by imprisonment in a county jail for a period of not less than 90 days or more than six months, or by both imprisonment and a fine of not exceeding two thousand dollars ($2,000), and shall not be released on probation, parole, or any other basis until he or she has served at least 90 days.

(c) Any person required to register with the chief of police or sheriff pursuant to Section 186.30 who violates subdivision (a) shall be punished as follows:

(1) Upon first conviction, by a fine not exceeding one thousand dollars ($1,000), by imprisonment in a county jail for a period of not more than one year, or by both that fine and imprisonment.

(2) Upon a second conviction, by a fine not exceeding two thousand dollars ($2,000), by imprisonment in a county jail for a period of not more than one year, or by both that fine and imprisonment. The court shall consider a period of imprisonment of at least 10 days.

(3) If the defendant has been previously convicted two or more times, by a fine not exceeding two thousand dollars ($2,000), by imprisonment in a county jail for a period of not more than one year, or by both that fine and imprisonment. The court shall consider a period of imprisonment of at least 90 days.

(d) As used in this section, “loiter” means to delay, to linger, or to idle about a school or public place without lawful business for being present.

(e) Nothing in this section shall preclude or prohibit prosecution under any other provision of law.