[[Administrative law|Administrative agencies]] will sometimes use an subpoena instanter to demand immediate compliance, but the [[Fourth Amendment]] typically guarantees a right to challenge such subpoenas in a court of law before being compelled to comply. | [[Administrative law|Administrative agencies]] will sometimes use an subpoena instanter to demand immediate compliance, but the [[Fourth Amendment]] typically guarantees a right to challenge such subpoenas in a court of law before being compelled to comply. |