Most drivers stopped on suspicion of impaired driving are asked to submit to field sobriety tests before they are arrested. Those tests often include the three standardized tests, which researchers have found to enhance officers’ ability to accurately identify impairment: the one-leg stand, the walk-and-turn, and the horizontal gaze nystagmus tests. Officers sometimes use other types of field tests that have not been validated, such as asking participants to recite the alphabet or to conduct counting exercises. Evidence gained from any of these pre-arrest tests may be admitted against the defendant at trial without running afoul of the Fifth Amendment right to be free from self-incrimination. That’s because suspects aren’t in custody for purposes of the Fifth Amendment or Miranda v. Arizona, 384 U.S. 436 (1966) when they are temporarily detained for a traffic stop and are asked a moderate number of stop-related questions. Berkemer v. McCarty, 468 U.S. 420, 440 (1984); State v. Braswell, 222 N.C. App. 176 (2012). But what if the suspect is asked to perform field sobriety tests after he is arrested? Must he first be provided Miranda warnings? Generally no. Why? Because the evidence gathered usually is physical rather than testimonial or communicative in nature. Case in point. In Pennsylvania v. Muniz, 496 U.S. 582 (1990), the United States Supreme Court considered whether a trial court erred in admitting a videotape of the defendant filmed after his arrest on impaired driving charges but before he was given Miranda warnings. The videotape included footage of the defendant [...]
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