filler
n.— «The man was a “filler” in a photo lineup of six black men. A filler is someone who is not a suspect, but whose photo is included because the filler fits the general description of a suspect who was in the photo lineup. There were six photos shown, five of which were fillers.» —“Victim identified man unrelated to case, new-trial motion shows” by Dan Galindo Journal (Winston-Salem, North Carolina) May 2, 2008. (source: Double-Tongued Dictionary)
Further reading
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