I was told the dark smoke are not legal by an officer. I was not using it we sold them. (A) No person who is the owner or operator of a motor vehicle shall fail to display in plain view on the front and rear of the motor vehicle the distinctive number and registration mark, including sticker and any validation sticker issued under sections 4503.19 and 4503.191 of the Revised Code, furnished by the director of public safety, except that a manufacturer of motor vehicles or dealer therein, the holder of an in transit permit, and the owner or motorized bicycle, manufactured trailer, or semitrailer shall display on the rear only. A motor vehicle that is issued two license plates shall display the validation sticker only on the rear license plate, except that a commercial tractor that does not receive an apportioned license plate under the international registration plan shall display the validation sticker commercial tractor. An apportioned vehicle receiving an apportioned license plate registration plan shall display the license plate only on the front of a commercial tractor and on the rear of all other vehicles. All license plates shall be securely fastened so as not to swing, and shall not be covered by any material that obstructs their visibility.