The appellants, Marvanic Development (Pty) Ltd and Useful Trading 16 (Pty) Ltd trading as Vaal Bricks, applied urgently for the return of two heavy-load semi-trailers seized and impounded by the South African Police Service. The police discovered that the trailers bore identical and falsified registration and chassis numbers and were not manufactured by the company indicated on their chassis plates. Criminal charges for possession of stolen property and fraud were initially laid but later withdrawn for lack of evidence. Relying on s 31(1)(a) of the Criminal Procedure Act 51 of 1977, the appellants sought return of the vehicles, alleging ownership and, alternatively, a lien for improvements. The High Court refused the application, holding that possession would contravene s 68(6)(b) of the National Road Traffic Act 93 of 1996 because possession of vehicles with falsified engine or chassis numbers is ‘without lawful cause’.