Standardized Field Sobriety Tests (SFST’s) were designed and validated in an office setting, with standard individuals, under standardized conditions. In real life, they’re rarely done under these appropriate and controlled circumstances. Whether it’s rocks, uneven pavement, rain, or a number of varying aggravating factors, all of these things can make the tests less reliable. In order for Standardized Field Sobriety Tests (SFST’s) must be administered in a standardized fashion and scored with standardized scoring techniques.