California Code, Health and Safety Code - HSC § 13963

(a) Adopt the same set of employee relations rules, regulations, and procedures for any or all districts.

(b) Authorize one examination for any or all districts for each classification of employment, establish one eligibility list, permit qualified candidates to transfer from one district to another, and allow requested changes in assignment.

(c) Adopt one seniority list to be used in the layoff of all employees of any or all districts. Persons laid off due to lack of work shall be eligible for reemployment and shall be reemployed in preference to the employment of new applicants. The district board may set a time limit on the use of this seniority list.