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An earwitness lineup (or voice parade) ordinarily is conducted by the police.  They have the witness listen to the suspect's exemplar included in a group of 3-6 recorded speech samples obtained from other people.  Ordinarily, the witness is required to listen to all the samples and make a choice as to which one is the perpetrator.  However, this approach has come under fire and research currently is being carried out to assess its validity (4, 7, 27, 34).  Moreover, guidelines for auditory lineups are being developed (16).  Basically, an earwitness lineup is defined as a process where a person who has heard, but not seen, a perpetrator attempts to pick his or her voice from a field of voices.  As a procedure, it must be conducted in a scrupulously fair manner.  Detailed criteria relative to the procedures involved are now available (16).