What is the test for cross-examination of a witness's identification testimony?

"To the extent that distinctive physical characteristics played a part in an identification, what was said in People v. Lawrence, 4 Cal.3d 273, 278-279 (93 Cal.Rptr. 204, 481 P.2d 212), has application: 'As long as the photographs from which the witness made his identification are preserved and available at trial, counsel for the accused, by using them in cross-examination of prosecution witnesses, can easily reveal the possibility of prejudice and thereby impugn the identification testimony.'