Motor vehicles purchased or leased by way of the county for the sheriff’s workplace will be truely marked on both facets with the phrases “SHERIFF’S DEPARTMENT.” The use of big vehicle door decals shall represent compliance with this section. Each such motor automobile will be marked on the perimeters or trunk top with the call of the county in clear letters of no much less than four (4) inches in peak. However, in instances wherein such identifying marks will prevent reliable investigations, the board of supervisors can also authorize the sheriff’s department to apply a unique variety of unmarked motors. The approval of the board will be entered on its minutes and shall include the manufacturer’s serial number and the motive why the vehicle or vehicles must be exempt from provisions of this phase. In addition, the producer’s serial quantity of all county-owned sheriff’s branch motors not challenge to the exemption shall be covered in such resolution or order of approval, and an authorized replica thereof will be furnished the State Department of Audit. Any car located to be in violation of this paragraph shall be said at once to the sheriff and the board of supervisors, and fifteen (15) days shall be given for compliance; and if now not complied with, such motors will be impounded by the State Auditor till well marked or exempted.