Many people believe that if their blood alcohol concentration (BAC) is below .08%, they cannot be arrested or convicted of driving while intoxicated (DWI). While Missouri law sets .08% as the legal limit for most drivers, that does not mean drivers with a lower BAC are automatically free from prosecution. In fact, Missouri law allows prosecutors to pursue DWI charges when they believe a driver's ability to operate a vehicle was impaired, even if a chemical test shows a BAC under .08%.
At Denise Kirby Law, we help clients throughout Kansas City understand their rights and build strong defenses against DWI charges. If you have been arrested with a BAC below the legal limit, it is important to understand what prosecutors must prove and how an experienced defense attorney can challenge their case.
For most adult drivers, a BAC of .08% creates a legal presumption that the driver was intoxicated. However, Missouri law does not require prosecutors to prove that every driver had a BAC of .08% or higher to obtain a conviction.
Instead, prosecutors may argue that a driver was impaired based on the totality of the circumstances. This means they can rely on evidence beyond the results of a breath or blood test.
Some examples include:
Even if your BAC is .05%, .06%, or .07%, prosecutors may attempt to argue that alcohol or another substance impaired your ability to drive safely.
Law enforcement officers make arrest decisions based on what they observe at the scene. If an officer believes there is probable cause to think you are impaired, they may place you under arrest before chemical testing is even completed.
Several situations can contribute to an arrest despite a lower BAC.
For example, alcohol affects everyone differently. Factors such as body weight, age, medications, fatigue, and food consumption can influence how a person reacts to alcohol.
An officer may also believe that another substance contributed to impairment. Prescription medications, over-the-counter drugs, and illegal substances can all affect driving ability.
Because of these variables, officers often look beyond the BAC number when deciding whether to make an arrest.
A BAC below .08% can make the prosecution's job more difficult, but it does not automatically result in a dismissal.
To obtain a conviction, prosecutors must convince the court that your ability to safely operate a vehicle was impaired.
They may rely on evidence such as:
Every piece of evidence should be carefully examined. An experienced attorney can identify weaknesses, inconsistencies, or constitutional issues that may affect whether the evidence is admissible or persuasive.
One of the most common pieces of evidence used in under-the-limit DWI cases is the field sobriety test.
These roadside exercises are designed to help officers evaluate possible impairment, but they are far from perfect.
Many factors unrelated to alcohol can affect performance, including:
Failing or struggling with these tests does not necessarily mean someone was impaired. In many cases, an attorney can challenge how the tests were administered or interpreted.
Many people assume that breath and blood test results are infallible. In reality, chemical testing is subject to strict procedures and maintenance requirements.
Potential issues may include:
Even when a BAC is below .08%, the accuracy and reliability of the testing process should still be evaluated.
No two DWI cases are exactly alike.
Some drivers register below .08% because they were still absorbing alcohol at the time of testing. Others may have consumed only a small amount of alcohol but exhibited signs that officers interpreted as impairment.
In other situations, a completely innocent explanation exists for the officer's observations. Medical conditions, allergies, nervousness, or fatigue can all produce symptoms that resemble intoxication.
That is why every piece of evidence should be reviewed in the context of the entire case rather than focusing on a single BAC number.
Being charged with DWI does not automatically mean you will be convicted.
Depending on the facts of your case, several defenses may be available, including challenging:
An experienced DWI defense attorney can analyze the evidence, identify weaknesses in the prosecution's case, and develop a defense strategy tailored to your circumstances.
One of the biggest mistakes people make after a DWI arrest is assuming their BAC alone determines the outcome.
Whether your BAC was .03%, .06%, .07%, or above .08%, the facts surrounding the stop, arrest, and investigation often play a much larger role than many people realize.
The sooner an attorney begins reviewing your case, the better the opportunity to preserve evidence, identify legal issues, and protect your rights throughout the legal process.
An early review may uncover problems with the investigation that could significantly affect the outcome of your case.
A BAC below .08% does not automatically prevent Missouri prosecutors from filing or pursuing a DWI charge. However, it may create important opportunities to challenge the evidence and build a strong defense.
If you are dealing with a DWI charge in Kansas City or anywhere in Missouri, our attorneys are here to help. Call us today or connect with us online to schedule a consultation and speak with an experienced DWI attorney.
