Under the Neil v. Biggers test for witness identification, what are the constitutional requirements

“During this case, the Supreme Court decided upon a five-factor test to ensure the reliability of identification of suspects in criminal cases. This test is used by the judicial system to ensure that identification of suspects is not suggestive or violate the defendant’s constitutional rights. The five factors are: the opportunity of the witness to view the criminal at the time of the crime; the witness’ degree of attention; the accuracy of the witness’s prior description of the criminal; the level of certainty demonstrated by the witness at the confrontation; and the length of time between the crime and the confrontation.” (Ingram 2018, p.228)