Colorado police officers have the right to administer field sobriety tests. They can conduct the horizontal gaze nystagmus test. During this test, you must follow an object with your eyes. The officer looks for any jerking in the eyeballs that would imply you are under the influence of alcohol. There is also the walk-and-turn test where you must take several steps from heel to toe, turn around and take several more steps. Again, the officer looks for anything that would imply intoxication.