<P> The suspect, along with several "fillers" or "foils"--people of similar height, build, and complexion who may be prisoners, actors, police officers, or volunteers--stand side - by - side, both facing and in profile . The lineup sometimes takes place in a room for the purpose, one which may feature a one - way mirror to allow a witness to remain anonymous, and may include markings on the wall to aid identifying the person's height . </P> <P> For evidence from a lineup to be admissible in court, the lineup itself must be conducted fairly . The police may not say or do anything that persuades the witness to identify the suspect that they prefer . This includes loading the lineup with people who look very dissimilar to the suspect . </P> <P> Photographs of the suspect and fillers can be shown to the identifier in what is called a "photo - lineup", or a "six pack". If the victim or witness successfully identifies the suspect from among the fillers, the identification is considered valid . There is some research into using other methods of photo - lineup that involve the witness sequentially viewing photographs rather than simultaneously . </P> <P> The sequential method is considered more accurate because it prevents the witness from looking at all the suspects and merely selecting the person that most resembles the guilty person . </P>

In real police lineups in california eyewitnesses incorrectly chose a foil about ___ of the time