What court order requires jailers to explain to a judge why a prisoner is being held?

• A. Writ of Habeas Corpus
• B. Ex Post Facto Laws
• C. Civil Liberties
• D. Due Process Clause

Answer: (A)

The key idea is protection against unlawful detention enforced by a specific court order. A writ of habeas corpus commands jailers to bring a detained person before a judge and show cause for the detention. This mechanism ensures that confinement is legally justified and not arbitrary, giving the courts a check on executive power to hold someone without lawful basis.

Ex post facto laws deal with applying laws retroactively and have no role in compelling a jailer to justify detention. Civil liberties refer to fundamental rights, a broad category rather than a specific order. The Due Process Clause guarantees fair procedures, but it isn’t itself a particular instrument that requires immediate court review of a detention. So the writ of habeas corpus is the instrument that directly requires jailers to explain to a judge why a prisoner is being held.