What is used to present photos in a way that protects the lineup administrator from seeing them until after the procedure is finished?

Using a randomly numbered, shuffled folder to present photos is essential for maintaining the integrity of the lineup process. This method ensures that the administrator does not influence the witness by being aware of which photos are associated with which number during the identification procedure. By shuffling the images and presenting them randomly, the administrator is prevented from having any prior knowledge about the identities of the individuals in the photos, which helps to reduce potential bias or unintentional cues that could affect the witness's choices and alter the validity of the identification process. This procedure is crucial in safeguarding the reliability of eyewitness testimonies and adhering to best practices in criminal investigations.