What legal order commands a person detaining another to produce the detained prisoner?

The legal order that commands a person detaining another to produce the detained prisoner is known as a writ of habeas corpus. This legal instrument is crucial in protecting individual freedoms and ensuring that a person's detention is lawful. When a writ of habeas corpus is issued, it requires the custodian of the prisoner to present the individual before a court, along with the reasons for their detention. This serves to prevent unlawful imprisonment and allows the court to assess whether the detention is justified under the law.

This mechanism is a foundational aspect of due process, reflecting the legal principle that one cannot be held without sufficient cause or trial. It provides a judicial check against arbitrary or unlawful detention, thereby safeguarding personal liberties.

The other options, while important in their own legal contexts, do not specifically serve the purpose of demanding the presence of a detained individual in court. For instance, a subpoena is generally used to compel someone to testify or produce evidence, a writ of mandamus orders a government official to properly fulfill their official duties, and an injunction is a court order requiring a party to do or refrain from doing specific acts. None of these options provide the same direct command as habeas corpus regarding detention matters.