The Modified Romberg test asks you to stand still, tilt your head back, close your eyes, and silently estimate the passage of 30 seconds. Officers use it to look for tremors and to gauge your "internal clock." I am Joel Brand, and the most important thing to know is what officers rarely volunteer: this is not one of the standardized tests, and it is even shakier than the ones that are.
How it is administered
With your feet together, head tilted back, and eyes closed, you tell the officer when you believe 30 seconds have passed. The officer watches for body and eyelid tremors, swaying, and how far off your time estimate is, treating both the tremors and the accuracy of your internal clock as supposed indicators of impairment.
It is not a standardized test
Only three field sobriety tests are NHTSA-standardized and validated: the HGN eye test, the walk-and-turn, and the one-leg stand. The Modified Romberg is not among them. There is no validated scoring system and no scientific agreement that a person's time estimate or minor tremors reliably indicate impairment. It is a test built largely on assumptions that have never been validated the way even the standardized battery was.
The internal-clock theory is shaky
The premise of the time-estimation portion is that alcohol distorts a person's sense of time, so an estimate far from 30 seconds supposedly signals impairment. The problem is that internal time perception varies enormously among completely sober people. Some habitually count fast, others slow, and stress compresses or stretches the sense of time for almost everyone. There is no established "normal" range that separates the impaired from the sober, which means an estimate of 25 or 38 seconds tells the officer very little. Treating a number that varies this much between sober individuals as evidence of intoxication is exactly the kind of unscientific leap that makes the test so vulnerable to challenge.
Tremors prove almost nothing
The other thing officers watch for, eyelid and body tremors, is equally weak as evidence. Tremors have countless innocent causes: cold weather, caffeine, fatigue, anxiety, low blood sugar, and a range of ordinary medical conditions and medications. Standing with your eyes closed and head tilted back deprives you of the visual cues you normally use to balance, so swaying is expected for anyone, drunk or sober. A position designed to be difficult should not be scored as if any difficulty reveals intoxication.
Why it is unreliable
Internal time perception varies wildly between sober people and with anxiety, which a roadside DUI stop produces in abundance. Tremors have countless innocent causes, including cold, caffeine, fatigue, and medical conditions. Standing with your eyes closed and head back challenges anyone's balance. Put together, the test asks an anxious person, in the dark, on uneven ground, to perform a task with no validated scoring, and then treats any imperfection as a sign of impairment, which is not a sound basis for anything.
It is often used in drug DUI cases too
The Modified Romberg shows up frequently in suspected drug DUI cases and as part of a Drug Recognition Expert evaluation, where the time-estimation and tremor observations are treated as signs of impairment by particular drug categories. The same weaknesses apply, and arguably with more force, because attributing a specific time estimate or tremor to a specific drug is even less grounded than tying it to alcohol. When the prosecution leans on Romberg observations to support a drug-impairment theory, the lack of any validated scoring becomes especially important, since there is no scientific basis for converting these observations into proof of impairment by a given substance.
How it fits the bigger picture
The Modified Romberg almost never decides a case on its own. The prosecution stacks it with the driving pattern, the officer's observations, the standardized tests, and any chemical result, hoping the combination suggests impairment. Discrediting it matters because removing each weak piece erodes the cumulative impression and refocuses attention on the evidence that actually controls the outcome, especially the chemical testing. Once a jury or a prosecutor understands that the time estimate and the tremors have no validated meaning, this test stops contributing to the impairment narrative the way the prosecution intended.
How I challenge it
These tests are scored on an officer's opinion, and that opinion is what I take apart: deviations from the standardized instructions, the conditions at the scene (lighting, slope, traffic, your footwear), your age, weight, and any injury or medical condition, and the innocent reasons a sober person stumbles on the side of a road. It rarely stands alone, and discrediting it weakens the whole impairment case. See the unfair field sobriety test defense and my top DUI defenses.
What the recording usually shows
The body-cam and dash-cam footage frequently undercuts the officer's account. A report may describe pronounced swaying or significant tremors, while the video shows a person standing reasonably steady in a deliberately difficult, eyes-closed, head-back position, or shivering in cold weather. The same is true of the time estimate, where the footage reveals whether the officer's stopwatch and instructions were even clear. I obtain the recordings in every case, because the contrast between the report's confident conclusions and what the camera actually captured is often where this unvalidated test comes apart.
You can decline field sobriety tests
For drivers 21 and over, the roadside tests are generally voluntary, and there is usually no penalty for politely declining. That is very different from the post-arrest chemical test, which is not optional. I explain the distinction in whether to refuse field sobriety tests. Compare the others: the HGN eye test, walk and turn, and one-leg stand.
Did a roadside test help convict you? Let's look.
If a field sobriety test like the Modified Romberg is driving the case against you, it deserves a hard, informed challenge, especially given that it was never validated in the first place. Use the free case analysis on this page, or call me directly at (888) 271-6644. I answer my own phone, 24/7.