showup
n.— «Benjamin Valentin picked Carmelo Herrera out of a lineup that contained only one suspect.…Writing for the majority, Justice John Wallace said such a one-on-one identification—known in police parlance as a “showup”—is “inherently suggestive,” but that is only the beginning of a court’s analysis.» —“Top court clears a one-on-one suspect ID” by Robert Schwaneberg Star-Ledger (New Jersey) June 21, 2006. (source: Double-Tongued Dictionary)
Further reading
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