1. The board of trustees shall certify to the chief of police who shall cause to be deducted from the salary of each member on each and every payroll for each and every pay period, seven percent of the compensation of each member who is not participating in the DROP, including each member whose participation in the DROP has ended and who has returned to active participation in the system pursuant to section 86.251, and zero percent of the compensation of each member who is participating in the DROP or whose participation in the DROP has ended but who has not returned to active participation in the system pursuant to section 86.251.

2. The deductions provided for in this section shall be made notwithstanding that the minimum compensation provided by law for any member shall be reduced thereby. Every member shall be deemed to consent to the deductions made and provided for in this section, and shall receipt for the member’s full salary or compensation and payment of salary or compensation less such deduction shall be a full and complete discharge and acquittance of all claims and demands whatsoever for services rendered during the period covered by the payment except as to benefits provided by sections 86.200 to 86.366. The chief of police shall certify to the board of trustees on each and every payroll or in such other manner as the board of trustees shall prescribe the amount deducted, and such amounts shall be paid into the system and shall be credited together with members’ interest thereon to the individual account of the member from whose compensation such deduction was made.

3. The board of trustees is authorized to grant additional benefits for such parts of contributions as were made prior to the adoption of the seven-percent rate for all members which were in excess of the compulsory contributions required of each member.