What defines a double blind photo array?

A double blind photo array is a procedure designed to reduce bias during eyewitness identification. In this method, neither the witness nor the administrator knows the identity of the suspect within the array. This approach helps to eliminate potential influences that could skew the witness's identification. When the administrator does not know who the suspect is, they cannot inadvertently give cues to the witness, either through their reactions or through verbal or non-verbal prompts. Similarly, when the witness is unaware of the suspect's identity, it prevents them from being influenced by any preconceived notions or expectations, leading to a more reliable identification process.

In contrast, if only the witness knew the suspect's identity, bias could originate from the witness's prior knowledge. If only the administrator knew the suspect's identity, they could unintentionally signal to the witness which person to identify. If the suspect is identified solely by the administrator, it undermines the integrity of the identification process, making it less reliable. Therefore, having both parties unaware of who the suspect is provides a neutral ground, enhancing the validity of the identification.