The most serious criminal cases are heard in the Crown Courts. Americans appearing in these courts, as one of Naomi’s characters has to do in The Witness, may find it an unusually disorienting experience because tradition is still honored through the wearing of wigs and robes by barristers and judges. After the police have collected sufficient evidence, prosecutions are handled by the Crown Prosecution Service (CPS). Solicitors prepare the cases for trial, and barristers present them.