to choose the individual that they believe committed the crime. there is a growing movement in law enforcement to move to a blind procedure in which the officer who shows the photos to the witness does not know who the suspect is. in music auditions for symphony orchestras take place behind a curtain so that the judges cannot see the performer. blinding the judges to the gender of the performers has been shown to increase the hiring of women. blind tests can also be used to compare the quality of musical instruments.