California Code, Education Code - EDC § 48355

(a) The school district of residence of a pupil or a school district of enrollment to which a pupil has applied to attend may prohibit the transfer of the pupil pursuant to this article or limit the number of pupils who transfer pursuant to this article if the governing board of the district determines that the transfer would negatively impact either of the following:

(b) A school district of residence shall not adopt any other policies that in any way prevent or discourage pupils from applying for a transfer to a school district of enrollment.

(c) Communications to parents or guardians by districts regarding the open enrollment options provided by this article shall be factually accurate and not target individual parents or guardians or residential neighborhoods on the basis of a child's actual or perceived academic or athletic performance or any other personal characteristic.