Members who pay dues through paycheck deductions and all employees who become members and pay dues through such deductions shall continue to pay dues for the duration of this and each subsequent MOU. During the twenty-one (21) day period that is at least seventy (70) days prior but no more than ninety (90) days prior to the expiration of this and any subsequent MOU, members shall have the right to withdraw membership by discontinuing dues deduction. The employee shall communicate the withdrawal in writing to the Controller by certified mail. Employees subsequently employed in a position outside of the unit repre¬sented by PDA shall not be required to continue dues deduction.

PDA shall hold the County and its officers and employees, including but not limited to the Controller, harmless for following the instructions contained in dues deduc¬tion authorizations. The County shall deliver revocations of member¬ship to PDA on a biweekly basis and include verification that receipt was by certified mail. The Controller shall accept authorization for dues deduction on a biweekly basis.