Rule 702

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When May Evidence of HGN Come on Down . . . or In?

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The question I am most frequently asked these days is some version of the following:

May a law enforcement officer trained in administering the HGN test testify at trial about a defendant’s performance on the test if no other expert testifies about the relationship between nystagmus and impairment by alcohol?

While the answer obviously is either yes or no, there is more than one way to analyze the issue. Since today is Thursday, I’m going to throw it back to Bob Barker and the Price is Right and give you two showcases to consider.

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State v. McGrady Confirms NC is a Daubert State:  Now What?

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The North Carolina Supreme Court held in State v. McGrady, __ N.C.___ (June 10, 2016), that Rule 702(a) of the North Carolina Rules of Evidence incorporates the standard set forth in Daubert v. Merrell Dow Pharmaceuticals, 509 U.S. 579 (1993). That’s what the court of appeals had already said, so it isn’t a big surprise. In McGrady, the application of Daubert led the state supreme court to conclude that the trial court did not err in excluding testimony from an expert in law enforcement training about the defendant’s conscious and unconscious responses to a perceived threat from the victim. McGrady’s analysis opens the door for reconsidering the admissibility of many types of expert testimony previously admitted as a matter of course, including expert testimony from law enforcement experts involving scientific and medical principles.

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A Rare Opinion on Criminal Discovery in North Carolina

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There seem to be fewer and fewer reported decisions about criminal discovery in North Carolina. A recent North Carolina Supreme Court decision finding a discovery violation by the prosecution, State v. Davis (Apr. 15, 2016), made me wonder why. This post reviews the evolution of North Carolina’s criminal discovery laws, which has brought relative calm to this area of law, along with the decision in Davis, which deals with a recurring issue about disclosure of expert opinion.

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Only Experts Can Testify About HGN

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Author’s note:  I added the conclusory paragraph at the end of this post shortly after its initial publication in response to helpful questions from readers about the significance of State v. Godwin and State v. Torrence.

Like Supercalifragilisticexpialidocious, horizontal gaze nystagmus is a mouthful. Unlike Supercalifragilisticexpialidocious, not just anyone can utter horizontal gaze nystagmus and sound wise beyond her years. Two recent court of appeals opinions hold that that a witness be qualified as an expert before testifying about the results of a horizontal gaze nystagmus test.

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State v. Osteen:  Court of Appeals Approves Admission of Lay and Expert Opinion Testimony Regarding Drug Impairment

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Proving that a driver was impaired by alcohol is not all that difficult, particularly when the driver submits to a breath test and the result is .08 or more.  Proving that a driver was impaired by drugs or by a combination of alcohol and drugs is considerably more challenging. But an opinion released yesterday by the court of appeals demonstrates one way in which it can be done, even without a confirmatory chemical test.

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Daubert Doesn’t Look Much Different from Howerton When it Comes to Retrograde Extrapolation

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The court of appeals gave the green light last week for law enforcement officers to continue to testify as scientific experts in DWI cases involving retrograde extrapolation–notwithstanding the legislature’s amendment of Rule 702 to adopt the Daubert standard. The court held in State v. Turbyfill that a field technician for the Forensic Test for Alcohol Branch of DHHS (FTA), who was trained as a law enforcement officer and chemical analyst (which authorized him to conduct implied consent testing on breath testing instruments), was properly allowed to testify about a retrograde extrapolation calculation he performed using an FTA form. The technician’s inability to explain whether the rate he used to make the calculation was an “average,” a “mid-point,” or a “conservative” rate—he used all three terms to describe it—did not disqualify him as an expert since he “provided the trial court with a list of some thirty-nine articles . . . regarding blood alcohol research,” and “with North Carolina cases in which this Court upheld the use of retrograde extrapolation to establish blood alcohol content.”

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Daubert and Expert Testimony of Impairment

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With the amendment of Rule 702 of the North Carolina Rules of Evidence in 2011, North Carolina became a Daubert state. That change means that trial judges in this state, like their federal counterparts, serve as gatekeepers when faced with a proffer of expert testimony. See Daubert v. Merrell Dow Pharmaceuticals, 509 U.S. 579 (1993) … Read more