Maine Eyewitness Identification Instruction is a set of guidelines for law enforcement personnel to use when conducting an eyewitness identification process. It is meant to ensure that the identification process is unbiased and reliable. It includes guidelines for conducting a line-up, photo array, or show-up identification procedure; providing instructions to the eyewitness; and recording the results. Different types of Maine Eyewitness Identification Instruction include blind administration, double-blind administration, simultaneous line-ups, and sequential line-ups. Blind administration refers to the procedure of having a third party (such as a police officer) present during the identification process who does not know the suspect's identity. Double-blind administration is the same, but involves two third parties, one of whom is unaware of the suspect's identity. Simultaneous line-ups involve presenting all participants to the witness at the same time, while sequential line-ups involve presenting participants one at a time.