What is a key rule concerning a photo array?

A critical guideline regarding photo arrays is that they should aim to minimize bias and ensure that the identification process is fair and reliable. Conducting a serial single photo array by an officer not involved in the case is significant because it helps maintain the integrity of the identification process. When an officer who is not connected to the investigation administers the photo array, it reduces the chance of suggestive influence or unintentional cues guiding the witness toward a particular suspect.

This method also helps in ensuring that the witness's identification is based solely on their memory rather than external factors that might arise from familiarity with the case or the officer’s involvement. Such practices are designed to uphold the reliability and fairness of the identification process, which is vital in law enforcement and the judicial system, particularly to protect the rights of individuals accused of a crime.