What is the test for establishing that show-up was a legitimate identification procedure?

Each case must be considered on its own facts, and whether due process was violated depends on the totality of the circumstances surrounding the confrontation. Simmons v. United States, 390 U.S. 377, 383 (1968); see also Stovall, 388 U.S. at 302. If the court finds that a challenged procedure is not impermissibly suggestive, the due process inquiry ends. United States v. Bagley, 772 F.2d 482, 493 (9th Cir. 1985) ("Having concluded that the ... show-up was a legitimate identification procedure, we need not reach the question whether the [witness's] identification was reliable under the test enunciated in Biggers.").