Oregon Revised Statutes Public Financial Administration § 293.406

(1) The State Treasurer shall pay on demand all items presented to the State Treasurer for payment if there are appropriate and sufficient funds in the State Treasury, as provided by law, to make the payments. If a law requires that an item be paid from a particular fund, the State Treasurer must make the payment from that fund only.

(2) When a state officer authorizes issuance of, or signs, a check, warrant or electronic funds transfer on behalf of an agency, the officer is certifying that the expenditure of moneys represented by the check, warrant or request for electronic funds transfer is authorized by law. For purposes of this subsection, an expenditure is authorized by law if:

(3) The State Treasurer may rely on the certification described in subsection (2) of this section and need not investigate or inquire whether a check, warrant or request for electronic funds transfer is authorized by law before paying the check, warrant or electronic funds transfer.

(4) As used in this section, “state officer” means any person acting on behalf of a board, commission, department, institution, branch or agency the costs of which are paid in whole or in part from funds held in the State Treasury.