Do I Have to Take a Field Sobriety Test?
If stopped for suspicion of DWAI, you do not have to consent to a field sobriety test. Until you are under arrest, you have no legal obligation to provide any information to law enforcement. Once arrested, failure to consent to a chemical test can result in legal penalties.
The officer needs a reason to arrest you. If you do not provide any information, it is harder to justify an arrest. For example, if stopped after consuming one beer, you do not need to tell the officer what you consumed or consent to a field test.
The officer can place you under arrest and require a blood alcohol test. However, more time passes between the stop and the chemical test, giving your body more time to process the alcohol in your system.