Where it fits in a stop
The one leg stand test is one of a small set of roadside exercises an officer may ask a driver to perform before deciding whether to make an arrest. The officer is watching for a short list of specific things and writing down what is observed, and that written observation becomes part of the basis for what happens next. Many stops are also captured on a dashboard or body-worn camera. Whether you were required to attempt the exercise at all depends on where you were stopped and what you were told, which is something we check rather than assume.
Why performance is not a clean measure
Balance on one foot is affected by a great many things that have nothing to do with alcohol. Knee, back, ankle, and inner ear conditions, injuries, weight, age, and footwear all matter. So does the setting: a sloped shoulder, loose gravel, traffic passing a few feet away, headlights, cold, rain, and the ordinary nervousness of being scored at the roadside by someone who already suspects you. Those conditions are rarely described in the report, which is one reason the footage is often more useful than the paperwork.
What to gather and what we look at
Request the video early, since agencies hold recordings only for a set period and then recycle them. Keep every piece of paper you were handed at the stop and at the station, note the exact location and time, and collect medical records for anything that affects balance. Photograph your shoes and the surface if you can return to the spot. In a first conversation we compare what the report claims against what the recording shows, look at whether the stop itself was properly made, and identify what other testing exists beyond the roadside exercises.
