What must a private citizen do immediately after detaining another person?

When a private citizen detains another person, it is essential to notify law enforcement as soon as possible. This action is critical for several reasons.

First, the role of law enforcement is to handle situations involving criminal activity. A private citizen may have certain rights to detain someone under specific circumstances, typically involving a citizen's arrest where a crime is witnessed or has just occurred. However, the responsibility to investigate, arrest, and handle legal proceedings lies with law enforcement professionals who are trained to do so.

Furthermore, contacting law enforcement ensures that the situation is resolved within the legal framework and safeguards both the detained individual’s rights and the safety of the citizen making the detention. Prompt notification can also help avoid potential escalation or misunderstandings while waiting for law enforcement's arrival.

Other choices do not fulfill the necessary legal obligations following a detention. Releasing the person immediately does not take into account the context of the detention. Contacting the media might hinder more than help by escalating the situation or compromising the integrity of any investigation. Interviewing the detained individual can complicate matters further and potentially lead to legal troubles if not handled correctly, as a private citizen is not equipped to manage such interactions formally. Thus, notifying law enforcement is the most responsible and legally sound course