Can pre-emptive detention, purely to prevent a person committing an offence or a breach of the peace, where they have not yet committed an offence, be lawful under Article 5 of the ECHR? In R (Hicks) v Commissioner of Police of the Metropolis [2014] EWCA Civ 3 the Court of Appeal has said, “yes”: it may be lawful under Article 5(1)(c), provided that at the time of the arrest there is an intention to take the arrested person before the courts. It may also be lawful under 5(1)(b) in certain circumstances, not closely defined in the judgment.