Which of the following is not considered a best practice during a show-up?

During a show-up, providing suggestive cues to witnesses is not considered a best practice because it can lead to biased and unreliable identifications. The goal is to ensure that the witness's response is based solely on their independent observations rather than being influenced by external factors. Suggestive cues can inadvertently guide the witness towards a certain answer, compromising the integrity of the identification process.

Best practices during a show-up focus on minimizing the potential for error. Controlling system variables involves managing the conditions under which the identification occurs, such as ensuring that the suspect is presented in a manner that does not unduly influence the witness. Providing consistent instructions ensures that the witness understands the process, which helps reduce misidentification. Identifying relevant estimator variables, which are factors outside the control of law enforcement that can impact the accuracy of witness memory, is also crucial to understanding the reliability of the identification.

By following these best practices, investigators can improve the accuracy of witness identifications and help ensure that justice is served based on reliable evidence.