delivered the opinion of the court:
Defendant, Robert E. Buening, was arrested on October 18, 1990, for driving under the influence of alcohol in violation of section 11— 501(a)(2) of the Illinois Vehicle Code (Ill. Rev. Stat. 1989, ch. 951/2, par. 11 — 501(a)(2)). On November 9, 1990, he was charged by information with driving under the influence of alcohol. On January 3, 1991, defendant filed a motion in limine seeking suppression of all evidence regarding the administration of the horizontal gaze nystagmus (HGN) test. At the hearing on defendant’s motion, the State’s Attorney requested the matter be set for an evidentiary hearing. Defendant resisted the State’s request, arguing that the results of an HGN test were inadmissible in the prosecution of a charge of driving under the influence of alcohol. The State asserted the test results were admissible as a factor considered by the arresting officer in reaching his conclusion defendant was under the influence of alcohol, as opposed to establishing the actual blood-alcohol concentration (BAG) of defendant’s blood. After taking the case under advisement, the trial court granted defendant’s motion in limine stating that the HGN “results should be inadmissible for any reason, including the limited purpose of showing the reason or basis for the arrest, i.e., defendant’s intoxication.” The court further stated: “[E]ven if HGN testing was relevant and admissible for the limited purpose of showing defendant’s intoxication, the prejudice of such ‘scientific’ evidence on the issue of blood-alcohol concentration far outweighs its probative value on the issue of defendant’s intoxication.” The State timely filed a certificate of substantial impairment and notice of appeal. We reverse and remand.
Nystagmus, a physiological phenomenon, is a term used to describe an involuntary jerking of the eyeball. “[It] *** is characterized by a slow drift, usually away from the direction of gaze, followed by a quick jerk of recovery in the direction of gaze. A motor disorder, it may be congenital or due to a variety of conditions affecting the brain, including ingestion of drugs such as alcohol and barbiturates, palsy of lateral or vertical gaze, disorders of the vestibular apparatus and brainstem and cerebellar dysfunction.” (Emphasis added.) (The Merck Manual of Diagnosis and Therapy 1980 (14th ed. 1982).) Horizontal gaze nystagmus then is the inability of the eyes to maintain visual fixation as they are turned from side to side or move from center focus to the point of maximum deviation at the side. (State v. Garrett (1991),
“the driver [being] asked to cover one eye and focus the other on an object (usually a pen) held by the officer at the driver’s eye level. As the officer moves the object gradually out of the driver’s field of vision toward his ear, he watches the driver’s eyeball to detect involuntary jerking. The test is repeated with the other eye. By observing (1) the inability of each eye to track movement smoothly, (2) pronounced nystagmus at maximum deviation and (3) onset of the nystagmus at an angle less than 45 degrees in relation to the center point, the officer can estimate whether the driver’s blood alcohol content (BAG) exceeds the legal limit of .10 percent.” (State v. Superior Court (1986),149 Ariz. 269 , 271,718 P.2d 171 , 173.)
(See also Annot.,
Turning to other cases in Illinois which refused to admit results of HGN tests, People v. Vega (1986),
In contexts other than prosecution of DUI, this court itself has twice addressed the issue of admission of HGN test results in recent years. In People v. Griffith (1986),
Cases from other States have addressed the issue of the admissibility of HGN test results in prosecutions for driving under the influence of alcohol. State v. Superior Court (1986),
Other jurisdictions which have followed State v. Superior Court include Idaho, Louisiana, Montana and Texas. In State v. Garrett (1991),
Other jurisdictions which view the HGN test as no more scientific than other field sobriety tests do not require any expert interpretation before admitting test results into evidence. In State v. Nagel (1986),
Testimony by a properly trained police officer with respect to the administration and results of the HGN test was found admissible without need for further scientific evidence by the Iowa Supreme Court in State v. Murphy (Iowa 1990),
In People v. Ojeda (1990),
Still other jurisdictions have held that HGN tests do require expert testimony regarding their scientific reliability and acceptance. In State v. Borchardt (1986),
In State v. Reed (1987),
As the foregoing discussion demonstrates, there is a growing body of law concerning the nature of the HGN test, the requirements for entering HGN test results into evidence, and the purposes for which such results may be entered into evidence. According to the United States Department of Transportation Test Manual, as devised for use by law enforcement agencies, the HGN test is the single most accurate field test used in determining whether a person is alcohol impaired. (United States Department of Transportation, National Highway Safety Administration, Improved Sobriety Testing 4 (1984), cited in Bresson,
Accordingly, we reverse the trial court’s grant of defendant’s motion in limine and remand this cause for an evidentiary hearing consistent with this opinion.
Reversed and remanded.
GOLDENHERSH, P.J., and HARRISON, J., concur.
