DUI Defense: How to Defend Against a DUI Charge

DUI Defense

When law enforcement officers arrest you for allegedly driving under the influence, this represents a serious situation. If convicted, you not only face jail time, but also heavy fines and court costs. You also risk the possible suspension or revocation of your driver’s license. In addition, your DUI conviction can follow you for years, making it difficult for you to obtain satisfactory employment. Learn about your defense options when you are charged with a DUI and how an experienced lawyer can help.

First DUI Defense: Challenging Breathalyzer Test Results

When officers pull you over because they reasonably suspect that you’re driving drunk, they probably will ask you to take a breathalyzer test. While you have the legal right to refuse, your driver’s license likely will become immediately suspended if you do so. Your state’s department of motor vehicles has the authority to administratively suspend your license when you refuse to take a breathalyzer test. This is because all 50 states have implied consent laws. Under these regulations, when you completed your driver’s test, you impliedly consent to take a breathalyzer test if and when law enforcement officers ask you to.

A breathalyzer is a small device into which you blow. It measures the amount of alcohol on your breath, which it automatically translates into your blood alcohol content. If the device shows your BAC to be 0.08% or higher, this gives the officers the probable cause they need to arrest you for DUI.

You may have wondered how a breath test can measure the amount of alcohol in your blood. The underlying science is that when you drink, the alcohol circulates in your blood, ultimately arriving at your lungs. You then exhale a small amount of alcohol every time you breathe. While the science is good, the assumption that every 1 milliliter of alcohol you exhale represents 2,100 milliliters of alcohol in your blood is suspect.

Inaccuracies of Breathalyzers

Furthermore, breath alcohol tests are notoriously inaccurate. Experts estimate that as many as 23% of the people convicted of DUI nationwide based on a breathalyzer result were not driving drunk at all. The device simply registered a higher reading than it should have.

Even if the device officers used on you registered an accurate result, numerous factors other than alcoholic drink consumption can produce high readings. Some of these factors include the following:

  • Suffering from diabetes.
  • Taking one of  your prescription medicines shortly before you took the test.
  • Your body temperature may have been unusually high when you took the test.
  • Gargling with mouthwash or chewing a breath mint shortly before you took the test.
  • Eating acidic food, such as a vinaigrette salad dressing, shortly before you took the test.
  • Using a cleaning product or paint thinner containing alcohol shortly before you took the test.

Finally, breathalyzers must be properly maintained and calibrated with a special tool, ideally prior to each usage. Additionally, virtually all breath test device manufacturers recommend that officers receive specific training on their usage. Your attorney may be able to prove that the officer who performed your breathalyzer test either failed to receive the proper training or failed to properly maintain and calibrate the device prior to asking you to blow into it.

Second DUI Defense: Challenging Field Sobriety Test Results

Officers may also ask you to take a field sobriety test when they pull you over for suspected DUI. Again, you have the legal right to refuse to take this test, and in all likelihood, you should do so. Unlike refusing to take a breathalyzer test, your driver’s license will not become suspended if you refuse to take the field sobriety test.
On the other hand, officers may well arrest you if you refuse. Why? Because, theoretically, failing to cooperate with an officer gives them probable cause to believe that you are attempting to hide something, in this instance, driving drunk. Keep in mind, however, that even if you pass the field sobriety test, the officer may still arrest you. Therefore, you really have nothing to lose by refusing to take it.

The Standard Field Sobriety Test is actually three exercises that test your balance and coordination. Both of these deteriorate when you’re drunk. However, all three tests are subjective in nature, relying on the officer’s interpretation of your results. And just as with breathalyzer tests, many factors, including the following, can affect the way you perform the SFST exercises:

  • Whether you suffer from an inner ear or other condition that affects your balance
  • Your age and weight
  • Whether you took a legal prescription medication shortly before taking the SFST
  • Whether the officer had sufficient training and experience to know exactly how to instruct you to perform the SFST exercises, what to look for while you take them, and then how to interpret their observations

The Horizontal Gaze Nystagmus Test

The first SFST exercise is the horizontal gaze nystagmus test. Here the officer holds a pen or flashlight in front of your face and tells you to hold your head still and track the object’s movement with your eyes only while they wave it slowly from side to side in front of you. If your eyes “jump around” instead of moving smoothly, this may be a side effect of alcohol consumption.

The Walk-and-Turn Test

The second SFST exercise is the walk-and-turn test. Here the officer tells you to walk nine steps forward heel-to-toe, turn around and walk back the same way. If you can’t do this without losing your balance, supposedly this also indicates that you’re drunk.

The One-Legged Test

The final SFST exercise is the one-legged stand test. In this one the officer tells you to raise one of your feet approximately 6 inches and stand on your other foot for a minimum of 30 seconds. If you can’t do this without putting your raised foot back down or moving your arms to help you balance, the officer may assume you’re intoxicated.

Advantages of an Experienced DUI Lawyer

Now that you know how and why you may fail both a breathalyzer test and the Standard Field Sobriety Test, you can see that having an experienced DUI attorney in your corner to aggressively challenge these two forms of evidence is likely your best option in mounting a successful DUI defense.

Work With an Experienced Local Lawyer

Submit a request online today or call us at (866) 345-6784 to get in touch with an experienced DUI lawyer in your area.

How It All Works

Call us or answer the questions on this site. Your category, location, and additional information will help us connect you to a legal professional and we’ll send you the results instantly.

Which Areas of Law?

We have attorneys in over 20 legal categories to choose from.

How Much Does This Cost?

We don’t charge you to be connected. Some legal categories require upfront fees while others do not. The legal professional will determine this with you before you commit to anything.

Secured & Trusted