What does luck have to do with field sobriety tests? More than you think. That's because the three tests that make up the Standardized Field Sobriety Test rely on the observations of the officer administering them. As you can imagine, if the officer pulled you over on suspicion of drunk driving, the odds are already against you.
Research shows that several officers trained in administering the SFST come up with different conclusions when observing the same video tape of an individual taking the tests. Some officers said that the individual was impaired while others did not. The fact of the matter is that you could flip a coin to decide whether the officer administering your tests will think you are impaired and arrest you.