Expert testimony on eyewitness identification has been excluded in several cases, so counsel should be prepared for a challenge to its admissibility. Trial courts will weigh whether the proposed testimony is case specific and has probative value, and will consider such factors as whether the expert interviewed the eyewitnesses, visited the crime scene and observed the eyewitnesses’ testimony at trial. See also State v. Knox, 78 N.C. App. 493(1985), and State v. Cotton, 99 N.C. App. 615 (1990)