The tests are the Standardized Field Sobriety Tests, or SFST’s. The Cobb police officer wanted to use the tests to help build a DUI case against you. In many ways, the SFST’s are designed to be failed. And they are completely voluntary. Practically speaking, if an officer is requesting that a driver take the tests, chances are the officer will arrest the driver whether the tests are taken or not. Declining the tests does not have overt consequences. However, should the case proceed to trial, the Cobb prosecutors will likely try and introduce the individual’s refusal as evidence the person knew they were going to fail.