Final answer:
The National Institute of Justice recommends transporting the suspect to the witness's location for showups in criminal investigations.
Step-by-step explanation:
Showups are used in criminal investigations to allow a witness to identify a suspect. The National Institute of Justice recommends that for showups, the suspect be transported to the witness's location. This allows the witness to view the suspect in person and make an identification. Showups should not be held if either the victim or the suspect has to be transported.