Cal. Gov. Code § 71632.6

If the trial court is party to any memorandum of understanding or agreement with any bargaining unit that includes court employees that provides for an agency shop provision as of the implementation date of this chapter, the trial court and employee organization representing the trial court employees shall be obligated to honor the terms of the agency shop provision, including indemnification provisions, if any, for the duration of the memorandum of understanding or agreement. The implementation of this chapter shall not be a cause for a new agency shop election.