Can You Beat a DWI Charge in Missouri?

When people call our office after a DWI arrest, one of the first questions they ask is: Is there any way to beat this?

The honest answer is yes — more often than most people expect. A DWI charge is not a conviction. The prosecution still has to prove its case beyond a reasonable doubt, and there are many points in a DWI case where that burden can be challenged, undermined, or defeated entirely.

Here's what an experienced Missouri DWI defense attorney looks for.

Defense 1: The Traffic Stop Was Unlawful

Every DWI case begins with a traffic stop. And for that stop to be legal, the officer must have had reasonable articulable suspicion that a traffic violation or crime was occurring.

Weaving within your lane, driving slightly below the speed limit, or leaving a bar's parking lot are not, by themselves, sufficient grounds for a stop. If the officer pulled you over without adequate justification, everything that followed — the field sobriety tests, the breathalyzer, the arrest — may be suppressible.

A motion to suppress based on an unlawful stop is one of the most powerful tools in a DWI defense attorney's arsenal. When it succeeds, the prosecution's case often collapses entirely.

Defense 2: Field Sobriety Tests Were Improperly Administered

Field sobriety tests — the walk-and-turn, the one-leg stand, the horizontal gaze nystagmus test — are standardized procedures developed by the National Highway Traffic Safety Administration (NHTSA). Officers are required to administer them in a specific way, under specific conditions, to produce reliable results.

In practice, these tests are frequently administered incorrectly. Common problems include testing on uneven or sloped surfaces, failing to account for medical conditions, footwear, or age, giving unclear or incorrect instructions, and scoring errors or subjective interpretation.

Beyond administration errors, field sobriety tests are inherently unreliable indicators of impairment. Studies have shown that even sober individuals fail these tests at significant rates. A skilled defense attorney will scrutinize every aspect of how the tests were conducted and presented.

Defense 3: The Breathalyzer Result Is Unreliable

Breathalyzer machines are not infallible. They require regular calibration, proper maintenance, and correct operation by a trained officer. When any of these conditions are not met, the results can be significantly inaccurate.

Specific issues your attorney will investigate include calibration records (was the device calibrated within the required timeframe?), maintenance logs (has the device had any reported malfunctions?), operator certification (was the officer properly trained?), mouth alcohol contamination from a recent drink or medical condition like acid reflux, and radio frequency interference from electronic devices.

Even a small inaccuracy in a breathalyzer reading can be the difference between a BAC of 0.07% (below the legal limit) and 0.09% (above it).

Defense 4: Blood Test Issues

If a blood test was used, there are additional avenues for challenge. Blood samples must be collected, stored, and analyzed according to strict protocols. Problems with the chain of custody, improper storage temperatures, contamination, or errors in the laboratory analysis can all render a blood test result unreliable or inadmissible.

Your attorney can request the complete chain of custody documentation and, if warranted, retain an independent expert to analyze the sample or the testing methodology.

Defense 5: Rising Blood Alcohol

Alcohol takes time to absorb into the bloodstream. If you had a drink shortly before driving, your BAC at the time you were driving may have been lower than your BAC at the time you were tested — which could be 30 minutes to an hour later.

This rising blood alcohol defense argues that while your BAC may have been above the legal limit when tested, it was below 0.08% when you were actually operating the vehicle. This defense requires expert testimony and careful analysis of the timing and circumstances, but it can be highly effective in the right case.

Defense 6: Medical Conditions and Medications

Certain medical conditions and medications can mimic the signs of intoxication or produce false positives on chemical tests. Acid reflux and GERD can cause mouth alcohol that inflates breathalyzer readings. Diabetes and ketogenic diets can produce acetone, which some breathalyzers read as alcohol. Neurological conditions can affect balance and coordination, making field sobriety test performance unreliable. Certain medications can cause slurred speech, drowsiness, or other signs that officers associate with impairment.

If you have a relevant medical condition, your attorney will work with medical experts to present this evidence effectively.

Defense 7: Lack of Actual Physical Control

Missouri's DWI law prohibits operating a vehicle while intoxicated — but operating has a specific legal meaning. If you were sitting in a parked car with the engine off, or if there is a genuine question about whether you were actually driving, this can be a viable defense.

Courts look at factors like whether the keys were in the ignition, whether the engine was running, and where the vehicle was located. In some cases, the prosecution simply cannot prove beyond a reasonable doubt that you were operating the vehicle.

What Happens When a Defense Succeeds?

When a defense strategy is successful, the outcome can range from a complete dismissal of charges to a significant reduction. Common favorable outcomes include dismissal (charges dropped entirely, often following a successful suppression motion), acquittal at trial (not guilty verdict), reduction to a lesser charge such as careless and imprudent driving, and suspended imposition of sentence (SIS) which does not result in a conviction if completed successfully.

The Role of an Experienced DWI Attorney

None of these defenses are automatic. They require a thorough investigation of the facts, knowledge of Missouri DWI law, familiarity with the specific courts and prosecutors involved, and the skill to present the defense effectively.

Jeff Goldfarb has spent 30 years doing exactly this for St. Louis residents. He has handled hundreds of DWI cases across St. Louis City, St. Louis County, and the surrounding Missouri metro. He knows what to look for, he knows how to fight, and he knows how to get results.

If you've been charged with DWI in Missouri, don't assume the case is over. The right defense strategy, pursued from the moment of arrest, can make all the difference.

Get a free DWI defense consultation — call or text Jeff Goldfarb at (314) 229-1028.