If an officer believes that you are under the influence, they can request you to conduct field sobriety tests. The first test consists of the HGN test, which is to test and track your eyes. The second test is the walk and turn. The third test is the one leg stand. If you fail to comply with these tests, the officer can request that you do chemical tests. You can also be arrested if there are other signs of impairment such as erratic driving, balance issues, slurred speech, bloodshot eyes.