What is a custodial lineup?

A custodial lineup refers specifically to an identification procedure that occurs in a custodial environment, where individuals who are in custody (such as those arrested or detained) are presented to a witness or victim for identification purposes. This type of lineup is typically conducted under controlled circumstances to ensure that the identification process is fair and reliable, safeguarding against potential issues such as suggestiveness or coercion.

In this context, being 'in custody' means that the individuals do not have the freedom to leave and are being held by law enforcement, which is crucial for understanding the formal and legally binding nature of the process. This procedure is designed to allow witnesses to identify suspects in a more secure setting, which is vital for the integrity of criminal investigations.