Which of the following is an example of a procedural detention?

Issuing a warning is a clear example of procedural detention because it typically involves an officer engaging with an individual to provide guidance or inform them about a violation, without taking away their liberty or requiring them to stay in a specific location. The warning serves as a formal acknowledgment of behavior that may need correction, and is often part of the enforcement process aimed at preventing further infractions. It allows the individual to understand the misconduct and provides them the opportunity to comply without the immediate consequences of detention.

In contrast, conducting a vehicle search without consent, prohibiting entry to a public space, and requesting identification without cause can all lead to scenarios where an individual's freedom of movement is restricted. These actions imply a more intrusive level of authority and can be classified as forms of detention, especially if the individual feels they cannot leave or disengage from the officer's presence during those interactions. In procedural terms, a warning is less about confinement and more about compliance and education, which is why it stands as the correct example of a procedural detention in this context.