noun
substitute prison; police custody; police detention
Legal term for a police detention facility that functions as a substitute for a formal prison, often used for suspects awaiting trial. The English gloss 'substitute prison' is a direct translation of the kanji, while 'police custody/detention' reflects its practical function.
代用監獄制度は、刑事司法の重要な一部です。
The substitute prison system is an important part of criminal justice.
容疑者は代用監獄に拘留された。
The suspect was detained in a substitute prison.