Section XXIII-12.: on use of monies

    All the proceeds, assets and income of any public retirement
system administered by an agency of the State of Oklahoma shall be
held, invested, or disbursed as provided for by law as in trust for
the exclusive purpose of providing for benefits, refunds, investment
management, and administrative expenses of the individual public
retirement system, and shall not be encumbered for or diverted to any
other purposes.