A Supplement to the act of June 18, 1974 (No. 120), entitled "An act creating the Municipal Police Officers' Education and Training Commission; providing for the commission's membership, selection, compensation, and removal; providing for the powers and duties of the commission; providing for the appointment and duties of the chairman; providing for the act's applicability to the civil service laws; requiring training by certain political subdivisions and police departments; providing penalties for violation thereof; and making an appropriation," providing for the training of constables and the payment of their expenses in attending the training course.