San Antonio Lawyers / Field Sobriety Testing

Field Sobriety Testing

Want to learn about field sobriety testing? Watch this video to learn what you need to know. Then call our San Antonio DWI Lawyer for a free consultation.

Question: What types of field sobriety tests are administered in Texas?


In Texas, multiple field sobriety tests can be given by the officer. It’s up to the officer to decide what field sobriety test will be given. However, if an officer is well-trained, he knows what he’s doing. If he is a DWI task force officer, he’ll perform just three tests. One is the HGN; that’s a horizontal gaze nystagmus. The horizontal gaze nystagmus basically means the officer takes a pen, he moves it in front of your face, asks you to follow it with your eyes, and if your eyes make any jerky motion, you fail that test. There are many of causes of HGN. If you’re tired, if you’ve taken some cold medicine, if you’ve had a prior head injury, all those things can cause you to fail the HGN. If you fail the HGN, he’s probably going to arrest you, even if you did the other tests perfectly. Field Sobriety Testing One of the other tests they give is a nine-step walk-and-turn. The nine-step walk-and-turn is where you touch heel-to-toe, turn around and come back, and touch heel-to-toe counting nine steps, but there are also other parts of that test that the officer is looking at, and he doesn’t tell you that he’s grading you on these other things. One of the things he does is he tells you to stand heel-to-toe while giving you the instructions. So he gets you to stand in a heel-to-toe position and he goes through a long description of the test. Because it’s uncomfortable, and it doesn’t feel natural, a lot of people then switch to stand with their feet shoulder-width apart; you’ve just failed the test according to the officer.

The other thing he looks for is when you walk heel-to-toe, he literally means touching heel-to-toe. If you are more than a half inch apart on any of the steps, it’s a failure. That’s very awkward. It’s very uncomfortable. You’re out at night. You might be cold. It might be windy, and he asks you to perform this test. The other thing that occurs is he really doesn’t take into consideration the ground. If you fail the test, you fail the test. However, there could be stones; there could be gravel; it could be unlevel. All those things make it difficult to perform that test. The other test they ask you to do is do a one-legged stand. During the one-legged stand, part of the instructions is to lift your foot up, tip your toe down, and look at your toes. The reason they want you to look at your foot or your toe is it makes it harder to balance. If you look out on the horizon, it’s easier to balance. But he asks you to do the unnatural act of looking at your toe and count. Very often, clients do very well at that, but the officer will fail them for not looking at their foot; he fails them for not pointing their toe down; or maybe once during the test, they drop their foot slightly. The officer grades all the tests and if you’ve failed any part of it, you’re probably going to be arrested for DWI. If you’re arrested for DWI, then he’s going to ask you to take a breath or blood test. Before he does that, he reads a form and he describes to you the ramifications of the test, and then it’s up to you whether to take the breath or blood test. If an officer asks you to perform other tests, it probably means to me, in most cases, the officer’s not well-trained, and that actually may help us.

Were you or a loved one arrested for drunk driving and have questions about field sobriety testing? Contact a San Antonio DWI attorney at Rush & Gransee today for a consultation on your case and all of your potential defenses. Let our experience work for you. Attorney Kurt W. Gransee has achieved the highest rating of superb on Avvo. Read Our FREE DWI Guide

Successful Case Defending DWI

Pablo P. – A Texas trooper stopped our client for making a wide right turn.  According to the trooper our client appeared disorientated and failed the field sobriety tests.  The breath test was refused.  After numerous consultations with the prosecutor and providing him with photographic evidence of the scene, thereby creating doubt in the officer’s version of events, the case was rejected.  All charges were dismissed.