Rule 702. Testimony by experts.

(a) If scientific, technical or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by knowledge, skill, experience, training, or education, may testify thereto in the form of an opinion, or otherwise, if all of the following apply:

(1) The testimony is based upon sufficient facts or data.

(2) The testimony is the product of reliable principles and methods.

(3) The witness has applied the principles and methods reliably to the facts of the case.

(a1) Notwithstanding any other provision of law, a witness may give expert testimony solely on the issue of impairment and not on the issue of specific alcohol concentration level relating to the following:

(1) The results of a Horizontal Gaze Nystagmus (HGN) Test when the test is administered in accordance with the person's training by a person who has successfully completed training in HGN.

(2) Whether a person was under the influence of one or more impairing substances, and the category of such impairing substance or substances, if the witness holds a current certification as a Drug Recognition Expert, issued by the State Department of Health and Human Services.

(b) In a medical malpractice action as defined in G.S. 90-21.11, a person shall not give expert testimony on the appropriate standard of health care as defined in G.S. 90-21.12 unless the person is a licensed health care provider in this State or another state and meets the following criteria:

(1) If the party against whom or on whose behalf the testimony is offered is a specialist, the expert witness must:

a. Specialize in the same specialty as the party against whom or on whose behalf the testimony is offered; or

b. Specialize in a similar specialty which includes within its specialty the performance of the procedure that is the subject of the complaint and have prior experience treating similar patients.

(2) During the year immediately preceding the date of the occurrence that is the basis for the action, the expert witness must have devoted a majority of his or her professional time to either or both of the following:

a. The active clinical practice of the same health profession in which the party against whom or on whose behalf the testimony is offered, and if that party is a specialist, the active clinical practice of the same specialty or a similar specialty which includes within its specialty the performance of the procedure that is the subject of the complaint and have prior experience treating similar patients; or

b. The instruction of students in an accredited health professional school or accredited residency or clinical research program in the same health profession in which the party against whom or on whose behalf the testimony is offered, and if that party is a specialist, an accredited health professional school or accredited residency or clinical research program in the same specialty.

(c) Notwithstanding subsection (b) of this section, if the party against whom or on whose behalf the testimony is offered is a general practitioner, the expert witness, during the year immediately preceding the date of the occurrence that is the basis for the action, must have devoted a majority of his or her professional time to either or both of the following:

(1) Active clinical practice as a general practitioner; or

(2) Instruction of students in an accredited health professional school or accredited residency or clinical research program in the general practice of medicine.

(d) Notwithstanding subsection (b) of this section, a physician who qualifies as an expert under subsection (a) of this Rule and who by reason of active clinical practice or instruction of students has knowledge of the applicable standard of care for nurses, nurse practitioners, certified registered nurse anesthetists, certified registered nurse midwives, physician assistants, or other medical support staff may give expert testimony in a medical malpractice action with respect to the standard of care of which he is knowledgeable of nurses, nurse practitioners, certified registered nurse anesthetists, certified registered nurse midwives, physician assistants licensed under Chapter 90 of the General Statutes, or other medical support staff.

(e) Upon motion by either party, a resident judge of the superior court in the county or judicial district in which the action is pending may allow expert testimony on the appropriate standard of health care by a witness who does not meet the requirements of subsection (b) or (c) of this Rule, but who is otherwise qualified as an expert witness, upon a showing by the movant of extraordinary circumstances and a determination by the court that the motion should be allowed to serve the ends of justice.

(f) In an action alleging medical malpractice, an expert witness shall not testify on a contingency fee basis.

(g) This section does not limit the power of the trial court to disqualify an expert witness on grounds other than the qualifications set forth in this section.

(h) Notwithstanding subsection (b) of this section, in a medical malpractice action as defined in G.S. 90-21.11(2)b. against a hospital, or other health care or medical facility, a person shall not give expert testimony on the appropriate standard of care as to administrative or other nonclinical issues unless the person has substantial knowledge, by virtue of his or her training and experience, about the standard of care among hospitals, or health care or medical facilities, of the same type as the hospital, or health care or medical facility, whose actions or inactions are the subject of the testimony situated in the same or similar communities at the time of the alleged act giving rise to the cause of action.

(i) A witness qualified as an expert in accident reconstruction who has performed a reconstruction of a crash, or has reviewed the report of investigation, with proper foundation may give an opinion as to the speed of a vehicle even if the witness did not observe the vehicle moving.