Criminal procedure describes the rules and processes governing how criminal cases are investigated, prosecuted, tried and appealed, from first police contact through to sentencing and enforcement. It covers matters such as arrest, detention, charge, bail, disclosure, mode of trial, allocation, evidential rules, jury directions, pleas, trial management, sentencing procedure and appeal routes. The term is descriptive rather than a single statutory definition, but is underpinned by legislation, court rules and case law in each jurisdiction. In England and Wales, criminal procedure is primarily governed by the Police and Criminal Evidence Act 1984, the Criminal Procedure and Investigations Act 1996, the Criminal Procedure Rules and Criminal Practice Directions. In Scotland, it is largely set out in the Criminal Procedure (Scotland) Act 1995, supplemented by Act of Adjournal and authority on “solemn” and “summary” procedure. In Northern Ireland, key sources include the Police and Criminal Evidence (Northern Ireland) Order 1989 and Criminal Justice (Northern Ireland) legislation. In Ireland, criminal procedure is principally governed by the Criminal Justice Acts, the Courts (Supplemental Provisions) Act 1961 and associated rules of court. Across all four jurisdictions, criminal procedure is closely linked to fair trial rights and the administration of justice.