As a Houston DWI Attorney I get the opportunity to work in front of a lot of judges. When it comes to DWI, every judge has their own opinions and their own rules regarding pre-trial conditions. One thing that attorneys see often in court is the placement of an interlock device in a defendant’s car before they are ever convicted. An interlock device is a basically a machine that is placed in your vehicle that you need to blow into to get the car to start. If you have any alcohol in your system the car will not start and a report of the violation is sent to the court.