OPINION
GORDON, Chief Justice.
Leonard Joseph LoPresti (defendant) petitioned for review of a court of appeals' opinion affirming the superior court's grant of special action relief to the State. The superior court's ruling permits the State to introduce horizontal gaze nystagmus (HGN) test results, in the absence of a chemical analysis of defendant's blood alcohol content (BAC), as proof defendant violated A.R.S. § 28-692(A), which provides:
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