We also do both roadside breathalyzer tests *and* breathalyzer tests at the police station. The field sobriety test serves 2 purposes. First, even if the driver refuses the breathalyzer, if the person takes the FST and fails, that still gives the police probable cause to arrest the driver for impaired driving. Second, it’s to gather additional evidence of intoxication or impairment (by alcohol or another substance that wouldn’t show up on a breathalyzer) for the prosecutor to use when they charge the person with a DUI.
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