Expert Testimony about Eyewitness Identification

This post addresses three recurrent issues concerning eyewitness identification:

  1. When, if at all, is expert testimony about eyewitness identification admissible?
  2. When, if at all, is an indigent defendant entitled to funds with which to hire an expert on eyewitness identification?
  3. May jury instructions, rather than expert testimony, be used to inform the jury about factors relevant to the accuracy of an eyewitness identification?

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