Criminal law in United Kingdom

The United Kingdom has three criminal justice systems: England and Wales, Scotland, and Northern Ireland. They share broad principles but differ in offences, institutions, court structures, verdicts, terminology, and procedure. Criminal cases concern conduct treated as an offence against society. The prosecution normally has to prove the allegation to the demanding criminal standard, while the accused is treated as innocent unless guilt is established. Police may receive reports, investigate events, collect evidence, question people, make arrests, and use lawful search powers. A suspect should understand their right to legal advice before answering questions or making important decisions. Prosecution arrangements differ by jurisdiction. The Crown Prosecution Service operates in England and Wales, the Crown Office and Procurator Fiscal Service operates in Scotland, and the Public Prosecution Service operates in Northern Ireland. Less serious and more serious cases follow different court routes. Some cases are heard by a judge or judicial office holder without a jury, while serious trials may involve a jury under the rules of the relevant jurisdiction. Evidence can include witness accounts, documents, physical objects, medical material, recordings, and digital data. Rules decide what evidence can be admitted and how it may be challenged. After arrest or charge, a person may be released, held, or made subject to bail conditions. Breaching a condition or failing to attend court can create further serious problems. A guilty plea or finding of guilt can lead to penalties intended to punish, protect the public, reduce reoffending, or repair harm. Available sentences depend on the offence, circumstances, record, and jurisdiction. Victims and witnesses can receive information and support, but they do not personally control every prosecution decision. Anyone facing arrest, detention, charge, violence, or immediate danger should seek suitable help without delay.