 An Immigration Officer can enter and search a premises owned or occupied by someone arrested for an offence without warrant for nationality documents.It is an offence to assault an Immigration Officer, and an Immigration Officer may arrest a person if they reasonably suspect that the person has committed or is about to commit that offence.. On 13 September 2018, the Emergency Workers (Offences) Act 2018 received Royal Assent.This added a subsection which states any common assault and/or battery on an immigration officer is also now indictable and therefore subject to a maximum of 12 months if tried on indictment

At all times, an Immigration Officer may arrest any person that he has a reasonable suspicion of committing an indictable offence using the "any person powers" (also known as citizen's arrest) contained in Section 24A of the Police and Criminal Evidence Act 1984.