As long as there have been motorized vehicles, there have been intoxicated drivers. Initially, without the high-tech equipment we have today it was difficult to prove someone was drunk. The determination was made solely by the arresting officer. It would be necessary that they take several things into careful consideration including how erratic the driving was and the driver’s behavior. Field Sobriety Tests (FST) also aided law enforcement. Imposing specific tests on suspects helped improve reliability and provide some stability to officer’s decisions.