A. A witness who is qualified as an expert by knowledge, skill, experience, training,
or education may testify in the form of an opinion or otherwise if:
(1) The expert's scientific, technical, or other specialized knowledge will help the
trier of fact to understand the evidence or to determine a fact in issue;
(2) The testimony is based on sufficient facts or data;
(3) The testimony is the product of reliable principles and methods; and
(4) The expert has reliably applied the principles and methods to the facts of the
B. This Article shall also govern expert witnesses on the issue of memory and eyewitness
identification. In a criminal case, if a party seeks to offer the testimony of a memory and eyewitness
identification expert under this Article, such expert testimony may be considered
for admission only if all provisions of Paragraph A of this Article are satisfied. A memory and eyewitness identification expert's testimony may not be admitted under
this Article if there is physical or scientific evidence that corroborates the eyewitness
identification of the defendant. An expert's testimony admitted under this Paragraph shall not offer an opinion as
to whether a witness's memory or eyewitness identification is accurate.
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