In a photo lineup, all suspects should possess what characteristic?

In a photo lineup, it is essential that all suspects possess similar visible features to ensure a fair and unbiased identification process. This characteristic minimizes the risk of influencing the witness's selection based on the differences in appearance. When the suspects have similar features, such as hair color, skin tone, and facial structure, it allows witnesses to focus on the specific behaviors or characteristics related to the crime they remember, rather than extraneous factors that could lead them to choose a suspect simply based on their noticeable differences.

Having similar visible features contributes to the integrity of the identification process, which is vital in criminal investigations and helps to prevent wrongful convictions based on unintentional bias or suggestiveness. This practice aligns with the standards set for conducting reliable eyewitness identification procedures.