In what type of cases may a detained child be placed in a line-up?

A detained child may be placed in a line-up specifically if ordered by the court for the matter for which they are being detained. This requirement protects the rights of the child by ensuring that any actions taken, such as participating in a line-up, are legally sanctioned and relevant to the judicial proceedings.

In this context, the court's involvement ensures that there is a formal and legal justification for the line-up, which also minimizes the risk of inappropriate or unnecessary procedures being imposed on a minor. The involvement of the court helps ensure that the rights of the detained child are upheld throughout the legal process, reflecting a balance between law enforcement needs and the legal protections afforded to juveniles.

In contrast, the other options suggest broader or less regulated circumstances for line-up participation that may not align with legal protections and procedural safeguards necessary for minors.