Oregon Constitution Art. IX § 10

(1) Notwithstanding any existing State or Federal laws, an employee of the State of Oregon or any political subdivision of the state who is a member of a retirement system or plan established by law, charter or ordinance, or who will receive a retirement benefit from a system or plan offered by the state or a political subdivision of the state, must contribute to the system or plan an amount equal to six percent of their salary or gross wage.

2. On and after January 1, 1995, the state and political subdivisions of the state shall not thereafter contract or otherwise agree to make any payment or contribution to a retirement system or plan that would have the effect of relieving an employee, regardless of when that employee was employed, of the obligation imposed by subsection (1) of this section.

3. On and after January 1, 1995, the state and political subdivisions of the state shall not thereafter contract or otherwise agree to increase any salary, benefit or other compensation payable to an employee for the purpose of offsetting or compensating an employee for the obligation imposed by subsection (1) of this section.