Top DWI Defense Lawyer in Rockwall, TX

DWI stands for Driving While Intoxicated. In Texas, you can be convicted for Driving While Intoxicated if the State proves you were operating a motor vehicle in Texas while intoxicated by the introduction of alcohol, a drug, a dangerous drug or any combination thereof.

You can be found to be intoxicated in three different ways:

1. If the State proves that you were operating a motor vehicle in Texas while not having the normal use of your mental faculties,
2. If the State proves that you were operating a motor vehicle in Texas while not having the normal use of your physical faculties, or
3. If the State proves that you were operating a motor vehicle in Texas while having a Blood Alcohol Concentration (or BAC) of .08 or greater

The State is not required to prove all three of the above to get a DWI conviction. The State is only required to prove one of the three above.

Notice: The first two ways for the State to prove Driving While Intoxicated have nothing to do with a breath or a blood test. The State’s case rests completely on what a jury thinks is “NORMAL.” The legal definition of “NORMAL” is the “average non-intoxicated person.” Therefore, if the State does not have a breath or blood test to demonstrate the blood alcohol concentration (BAC) to the jury, then the jury is left with watching the video and listening to the police officer’s testimony to determine if you were normal.

There are several tests you can expect when being investigated for DWI.

The first series of tests that you can expect occur on the side of the road. These are called the Standardized Field Sobriety Tests (SFSTs). These tests are considered standardized because they were promulgated by the National Highway and Traffic Safety Administration (NHTSA) to be used by all police officers across the nation when investigating someone for Driving While Intoxicated. NHTSA has published guidelines for these tests and it is critical for the police officer’s to follow those guidelines exactly in order to get accurate results. The Standardized Field Sobriety Tests consists of a battery of tests including the Horizontal Gaze Nystagmus test, the Walk and Turn test, and the One Leg Stand test.

Horizontal Gaze Nystagmus Test

The Horizontal Gaze Nystagmus (HGN) Test is the eye test. It is where the officer usually takes a pen and has you follow it with your eyes. The officer is looking for what is called nystagmus which is the involuntary jerking of your eyes. People can get nystagmus when they have ingested depressants. Alcohol and many drugs act as a depressant in a person’s system and may cause nystagmus. However, there are many things that can affect nystagmus, including current or past head injuries, some eye problems, and a person may even have natural nystagmus.

Walk and Turn Test

The Walk and Turn Test is a test where an officer will have you stand one foot in front of the other while listening to his instructions. He will then have you walk 9 steps down an imaginary line touching your feet heel to toe and counting out loud. When you get to your ninth step, the officer will instruct you to take a turn using a series of steps and then go back down the same imaginary line you came. The officer is looking for the following clues of intoxication: 1) loses balance during the instruction phase, 2) starts too soon, 3) stops while walking, 4) misses heel to toe, 5) steps off line, 6) uses arms for balance 7) improper turn, and 8) takes the wrong number of steps.

One Leg Stand

The One Leg Stand test is a test where the officer will have you stand with your heels and toes together and place your arms at your side. He will then give you instructions to raise one of your feet off the ground approximately 6 inches with your toe pointed out and your leg straight. You will be required to look at your foot and count out loud, “one thousand one, one thousand two…” until the officer tells you to stop. The officer is looking for the following clues of intoxication: 1) swaying, 2) using arms for balance, 3) hopping, and 4) putting your foot down.

These tests are designed to test your mental and physical faculties at the same time. However, as you can tell they require a great deal of coordination doing things that are not natural in the way people go about their normal day. Without the police officer knowing your full medical history, he may count things against you that are simply not your fault.

Portable or Preliminary Breath Test

This is another test that may be offered to you on the side of the road. It is a machine that you blow in and will give the officer a reading of your breath alcohol concentration. It is not considered a standardized test. It is also inadmissible in court because it has not been deemed scientifically reliable.

Breath Test

AFTER you have already been arrested, a police officer may request that you take a breath test. This will happen at the jail. At the jail the police department has a machine called an Intoxylizer. This machine requires that you blow into it a series of times in order for the police officer to get a breath alcohol concentration. This device has to be calibrated properly and must be tested regularly by the police department to ensure it accurate results. Your medical history can also have an effect on your results.

Blood Test

The police officer may request you to take a blood test. Again, this is AFTER you have already been arrested. In some cities, the police officer may be able to get a search warrant for your blood if you choose to refuse. The blood test usually occurs at a hospital hours after your arrest. While most people think a blood test is a sure thing, there are actually numerous ways to challenge its reliability and accuracy.