It is unlawful for any person to have actual or constructive possession of any traffic sign or traffic-control device or portion thereof within the City of Redmond, whether or not the sign or device is the property of the City of Redmond, unless the sign, device or portion thereof was acquired by lawful means. Actual or constructive possession of any traffic sign or device without written evidence of lawful acquisition shall give rise to the legal presumption that the sign or device was not lawfully acquired; provided, that proof the sign or device was acquired lawfully shall be a defense to prosecution for violation of this section whether established by a written document or otherwise. (Ord. 1244 § 4 (part), 1985).