Different constitutions of the Court of Appeal have repeatedly warned practitioners (both defence and prosecution) of the need to be fully informed of the law relating to immigration offences and the defences available to criminal charges in an immigration context. Despite these warnings, there are still a number of such appeals each year. Furthermore, the Nationality and Borders Act 2022 has made radical amendments to existing offences that also significantly widen the number of people who are liable for prosecution. This practical guide provides coverage of the investigation and prosecution of immigration offences and ancillary proceedings, as well as criminal cases for foreign nationals. It covers every aspect of a criminal case from detention through to the Court of Appeal, with signposts to where further information can be found, and is up to date with the changes made by the Illegal Migration Act 2023. This is essential reading for criminal law practitioners, immigration law practitioners and the judiciary, as well as for students, academics and those working in third sector and government organisations. This title is included in Bloomsbury Professional's Immigration and Nationality Law online service.