Two States, Oregon and Washington, have enacted legislation establishing a procedure by which law enforcement officers, upon apprehending an unlicensed driver, could take possession of the driver's vehicle registration. In such cases, the driver is given a temporary registration certificate, and a striped ("Zebra") tag is placed over the annual sticker on the vehicle license plate. A new annual sticker can only be obtained by the owner demonstrating that he or she is properly licensed. This "Zebra" Tag Law was applied to sufficiently large numbers of offenders (about 7,000 in Washington and about 31,000 in Oregon) to provide an opportunity to evaluate both the general and specific deterrent effect of these laws on illegal driving by DUI offenders.