Denver Field Sobriety Test Lawyer
Field sobriety tests are not pass-fail scientific measurements. They are observations, made roadside, under stress, often at night, by an officer who has already formed an opinion about whether you are impaired. The results feed into a charging decision that can follow you for years. If you were arrested after performing these tests in Denver or the surrounding counties, a Denver field sobriety test lawyer can examine what actually happened on that roadside and whether the evidence holds up.
What Officers Are Actually Evaluating During These Tests
Colorado law enforcement officers trained in DUI detection typically use three standardized tests developed by the National Highway Traffic Safety Administration: the Horizontal Gaze Nystagmus test, the Walk-and-Turn, and the One-Leg Stand. These three are referred to as the Standardized Field Sobriety Tests, or SFSTs.
The Horizontal Gaze Nystagmus test involves an officer tracking involuntary eye movement as you follow a stimulus, typically a pen or light. The Walk-and-Turn requires nine heel-to-toe steps along a straight line, a pivot, and nine steps back. The One-Leg Stand requires you to hold one foot approximately six inches off the ground while counting aloud for thirty seconds.
Officers are trained to watch for specific “clues” during each test. In the Walk-and-Turn, for example, losing balance during instructions, starting too soon, stopping while walking, missing heel-to-toe contact, stepping off the line, using arms for balance, making an improper turn, or taking the wrong number of steps each count as clues. Two or more clues are considered an indicator of impairment. That framing sounds clinical. In practice, these tests are performed on roadsides with uneven pavement, traffic noise, flashing lights, and a person who may be anxious, tired, or physically limited regardless of alcohol consumption.
Where Field Sobriety Tests Break Down
The research behind these tests comes with significant caveats. Even under controlled conditions, the HGN test has a reported accuracy rate that leaves meaningful room for error. The Walk-and-Turn and One-Leg Stand are even less reliable when conditions deviate from the protocol NHTSA mandates for valid administration.
Officers must follow specific instructions when giving these tests. The surface must be reasonably dry, hard, level, and non-slippery. The person being tested must not be wearing heels more than two inches high. Certain medical conditions affect performance regardless of impairment. Inner ear disorders, prior knee or ankle injuries, neurological conditions, and even certain medications can produce the same clues an officer is trained to associate with alcohol.
Denver-area DUI stops happen frequently on I-25, I-70, Colfax Avenue, and near entertainment areas like LoDo and RiNo after games and concerts. These are not ideal conditions for conducting standardized testing. Shoulders are often uneven. Lighting is inconsistent. The pressure of traffic passing at speed affects a person’s balance in ways that have nothing to do with impairment.
Beyond the physical conditions, proper administration matters. If the officer skipped steps in the instructions, gave the wrong number of steps, did not demonstrate correctly, or failed to ask about medical conditions that affect the tests, those errors are part of the record. Body camera and dashcam footage often tells a different story than the officer’s written report.
Non-Standardized Tests and What They Actually Prove
Officers sometimes ask drivers to perform additional tasks that are not part of the NHTSA standardized battery. These might include reciting the alphabet, counting backward, or performing finger-to-nose tests. These non-standardized tests have no scientific validation equivalent to the SFSTs and carry significantly less weight in court. But they often still appear in police reports as evidence of impairment.
Knowing the difference between what is scientifically supported and what an officer simply observed matters when a case reaches the Jefferson County courthouse, the Arapahoe County Justice Center, or Denver District Court. Prosecutors build DUI cases on what officers document. A defense that dissects the testing conditions, administration errors, and the limits of what these observations actually prove can create real doubt about the conclusion that you were impaired.
Reid DeChant’s background as a public defender across Denver, Broomfield, and Adams County gave him direct experience with how these cases are built and where they can come apart. That same experience now informs how he reviews the field sobriety documentation in every case he takes on at DeChant Law.
Answers to Questions About Field Sobriety Tests in Colorado
Are field sobriety tests required by law in Colorado?
No. Colorado’s express consent law applies to chemical tests like breath or blood tests, not field sobriety tests. You can legally decline to perform field sobriety tests. Refusing them cannot be used as evidence of consciousness of guilt in the same way that chemical test refusal carries statutory penalties. That said, an officer who observes other indicators of impairment may still arrest you without the tests. The decision to refuse or comply is a meaningful one with real consequences either way.
Can field sobriety test results be challenged after an arrest?
Yes, and this is a common focus in DUI defense. The challenge can come from multiple directions: how the officer administered the tests, whether the conditions met NHTSA guidelines, whether the officer correctly identified and counted clues, and whether physical or medical factors explain the performance. Video footage, training records, and the officer’s certification history are all potentially relevant.
Does failing field sobriety tests mean I will be convicted?
No. Field sobriety test performance is evidence, not a verdict. Prosecutors use it to support their case, but a jury decides whether it proves impairment beyond a reasonable doubt. Cases have been won at trial even where defendants performed poorly on field tests, particularly when other evidence showed problems with how the stop was conducted or how the tests were given.
What if I have a physical condition that affected my performance?
This is one of the most important things to document immediately. Medical records, prior treatment history, and physician statements about conditions that affect balance, gait, or eye movement are directly relevant to explaining test performance. Officers are supposed to ask about medical conditions before administering tests. If they did not, that failure is part of the defense.
What happens to my driver’s license after a DUI arrest in Denver?
A DUI arrest triggers two separate proceedings: the criminal case in court and a DMV Express Consent hearing. The DMV side runs on its own timeline and its own rules. You typically have a short window after arrest to request a hearing. DeChant Law has had numerous DMV Express Consent actions dismissed, and that part of the case requires prompt attention.
How does dashcam or body camera footage affect a field sobriety case?
Significantly. The video often captures what the written report does not. Officers summarize what they observe, but video may show different conditions, a different sequence of instructions, or a performance that does not match the clues documented. Obtaining and reviewing footage early is a standard part of building a defense in these cases.
If I passed the field sobriety tests, can I still be charged with DUI?
Yes. An officer can choose to arrest based on other observations even if field sobriety performance was acceptable. Conversely, chemical test results can create charges independent of how someone performed on roadside tests. The field sobriety tests are one piece of a larger evidentiary picture, and the full picture matters in every case.
Your Next Decision Matters More Than the One You Made on the Roadside
The roadside stop is over. What happens next, who you hire and how quickly, shapes every stage that follows. DeChant Law represents people facing DUI charges across Denver, Jefferson County, Arapahoe County, Adams County, Douglas County, and Broomfield. Reid has tried these cases to verdict and challenged DMV actions with documented results. If your case involves field sobriety test evidence, contact a Denver field sobriety test attorney at DeChant Law to get a direct assessment of what that evidence actually shows and where it may be vulnerable.