What is the legal test for showing up at the scene of a crime?

As an initial matter, we note that in most cases it is unavoidable that a show-up at the scene of a crime will be suggestive of guilt to a certain degree. Nevertheless, this court has found that show-ups are not objectionable unless "the 'procedure was so impermissibly suggestive as to give rise to a very substantial likelihood of irreparable misidentification.' " United States v. Booth, supra, 669 F.2d at 1239. Although at first blush it may appear that this standard says no more than that a procedure should be permitted unless it is impermissible,

Page 586