When officers suspect you are driving a vehicle under the influence of alcohol, they may pull you over and ask you to take part in field sobriety tests. Authorities use the results of these tests to help them gather evidence and determine whether or not they have probable cause to arrest you for DUI.
However, these tests are not entirely foolproof. With this in mind, it is important to familiarize yourself with some of the factors that can affect your results.
What conditions can affect the results of your field sobriety tests?
Officers often conduct field sobriety tests on the of a busy road, often at night. Such an environment can potentially affect your balance, focus and coordination. Some common factors that might impact your results regardless of alcohol consumption include:
- Uneven or unstable surfaces: Gravel, sand, wet pavement, potholes or sloped shoulders
- Poor lighting: Darkness, flashing patrol lights or glare from the headlights of passing vehicles
- Weather: Rain, wind, heat or cold
- Traffic conditions: Loud noise and vehicles passing close by
- Footwear and clothing: Heels, boots or tight clothing that can restrict your movement
Bear in mind that field sobriety tests are completely voluntary. Florida law does not require you to perform these exercises, and no statute compels you to complete them. However, an officer may still rely on your performance, along with other observations, to justify an arrest for DUI.
After arrest, the state’s implied consent law in Florida Statutes Section 316.1932 requires you to submit to lawful breath, blood or urine testing, or face license consequences. This makes these roadside tests important because they often affect an officer’s decision to make an arrest.
Can an officer’s instructions affect your results?
Field sobriety exercises depend on clear instructions and stable conditions. Small changes can affect how you perform. Potential issues concerning officers include:
- Confusing or rushed directions
- Unclear or incorrect instructions
- Limited space to walk or turn
- Interruptions from radios or other officers
- Bright flashlights or other distractions
It is also worth mentioning that if the officer conducts the horizontal gaze nystagmus test, other factors such as light, moving traffic or improper positioning can influence what officers can observe. Authorities also use your speech patterns, driving behavior and other observations when deciding whether to arrest you.
What should you do if you face a DUI charge?
Road surface, lighting, weather, traffic and unclear instructions can affect your performance on field sobriety exercises. If external factors affect how well you do and the authorities arrest you, you should note them as soon as possible.
Many people seek legal guidance to help them deepen their understanding of the complex laws, especially when it comes to DUI cases. With the help of an attorney, you can become more aware of your rights and strengthen your defense in case an officer wrongfully arrests you for DUI.

