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Expert Testimony – HGN test

State v. Rodney G. Zivcic, 229 Wis.2d 119, 598 N.W.2d 565 (Ct. App. 1999)
For Zivcic: John J. Carter

Holding: The trial court’s discretionary determination to admit expert testimony on the HGN sobriety test is upheld. In particular, specialized knowledge in the “underlying principles” of HGN testing isn’t necessary. All that’s required is expertise in administering and evaluating the test.

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