Cal. Health and Safety Code § 11362.768

(a) This section shall apply to individuals specified in subdivision (b) of Section 11362.765. (b) No medicinal cannabis cooperative, collective, dispensary, operator, establishment, or provider who possesses, cultivates, or distributes medicinal cannabis pursuant to this article shall be located within a 600-foot radius of a school. (c) The distance specified in this section shall be the horizontal distance measured in a straight line from the property line of the school to the closest property line of the lot on which the medicinal cannabis cooperative, collective, dispensary, operator, establishment, or provider is to be located without regard to intervening structures. (d) This section shall not apply to a medicinal cannabis cooperative, collective, dispensary, operator, establishment, or provider that is also a licensed residential medical or elder care facility. (e) This section shall apply only to a medicinal cannabis cooperative, collective, dispensary, operator, establishment, or provider that is authorized by law to possess, cultivate, or distribute medicinal cannabis and that has a storefront or mobile retail outlet which ordinarily requires a local business license. (f) Nothing in this section shall prohibit a city, county, or city and county from adopting ordinances or policies that further restrict the location or establishment of a medicinal cannabis cooperative, collective, dispensary, operator, establishment, or provider. (g) This section does not preempt local ordinances, adopted prior to January 1, 2011, that regulate the location or establishment of a medicinal cannabis cooperative, collective, dispensary, operator, establishment, or provider. (h) For the purposes of this section, “school” means any public or private school providing instruction in kindergarten or any of grades 1 to 12, inclusive, but does not include any private school in which education is primarily conducted in private homes.