California Code, Education Code - EDC § 44501

(a) The consulting teacher shall be a credentialed classroom teacher with permanent status or, in a school district with an average daily attendance of less than 250 pupils, a credentialed classroom teacher who has completed at least three consecutive school years as an employee of the school district in a position requiring certification qualifications.

(b) The consulting teacher shall have substantial recent experience in classroom instruction.

(c) The consulting teacher shall have demonstrated exemplary teaching ability, as indicated by, among other things, effective communication skills, subject matter knowledge, and mastery of a range of teaching strategies necessary to meet the needs of pupils in different contexts.