(2) A vehicle need not be marked as required by subsection (1) of this section and need bear only such evidence of registration as is required on privately owned vehicles if:
(a) In the opinion of the Director of the Oregon Department of Administrative Services, the marking of the vehicle as required by subsection (1) of this section would unduly hinder the department or institution owning or operating the vehicle in carrying out its duties and functions; and
(b) The department has approved in writing the operation of the particular vehicle without being marked as required by subsection (1) of this section.
(3) Notwithstanding subsection (1) of this section, the department shall, upon request of any state law enforcement agency or state parole or probation agency for which the department obtains vehicles, obtain for the agencies vehicles that are not marked as required by subsection (1) of this section and that have registration described in ORS 805.060. [Formerly 291.724; 1987 c.6 §3; 1993 c.741 §118]