California Code, Education Code - EDC § 32212

(a) The Legislature finds and declares that interruption of class time seriously impairs the educational process.

(b) It is the intent of the Legislature that each governing board of a school district formally address the problem of classroom interruptions and adopt a policy to control those interruptions, consistent with local circumstances and practices.

(c) The Superintendent of Public Instruction shall develop and distribute to each governing board of a school district a model policy for the reduction and control of classroom interruptions, including, but not limited to, intercom and public address system use.