The Use Of Force Legal Test

The Test Itself

Whether force used by a police officer was lawful as a matter of criminal law comes down to one consistently applied question: was the force reasonable in the circumstances as the officer honestly believed them to be. The source is statute as well as common law. Section 3(1) Criminal Law Act 1967 allows "such force as is reasonable in the circumstances" in the prevention of crime or in making a lawful arrest. Section 76 Criminal Justice and Immigration Act 2008 applies where a defendant relies on s.3(1), common law self-defence or common law defence of property and the question is whether the degree of force was reasonable. It fills in that question: reasonableness is decided by reference to the circumstances as the defendant believed them to be (s.76(3)), and force that was disproportionate in those circumstances is not to be regarded as reasonable (s.76(6), outside a householder case, where s.76(5A) asks whether it was grossly disproportionate). It has two components worth separating clearly, honest belief and proportionate reasonable force, because promotion-level questions often test whether you can apply both correctly to an unfamiliar scenario, not just recite a phrase.

A note on wording: you will often see this described as force that is "no more than necessary". That is loose shorthand, not the language of s.3 or s.76. The statutory word is "reasonable", and necessity appears in s.76(7), which says an officer acting for a legitimate purpose may not be able to weigh to a nicety the exact measure of any necessary action, and that evidence of having done only what they honestly and instinctively thought was necessary is strong evidence that only reasonable action was taken. In the exam, prefer options that use the statutory wording. Our longer topic page, use of force and human rights revision, sets out every sub-section of s.76 and the householder rules.

Why Hindsight Never Enters The Test

The test is deliberately fixed to the moment of decision, not what a calm assessment afterward reveals was actually true. Under s.76(4), if the officer genuinely held a belief about the circumstances, they can rely on it whether or not it was mistaken and whether or not the mistake was a reasonable one. The reasonableness of the belief only goes to whether it was genuinely held, so an honest but mistaken belief that they were about to be attacked is judged as if true. Two limits matter: a mistake caused by voluntarily induced intoxication cannot be relied on (s.76(5)), and the force must still not be disproportionate in the circumstances as believed (s.76(6)). The common law principle behind this is R v Williams (Gladstone) (1984) 78 Cr App R 276, and s.76(9) confirms the section clarifies the existing defences rather than creating a new test.

Same Standard, Every Tactic

A common misconception is that certain tactics, such as a Taser, a baton strike or restraint techniques, are governed by their own separate legal standard. They are not. Every use-of-force option is assessed against the same reasonableness test in s.3 CLA 1967 and s.76 CJIA 2008; what differs between tactics is the tactical and medical guidance about when and how to deploy each one safely, not the underlying legal threshold for whether using it was lawful.

A Separate Conduct Standard, Reworded From 30 June 2026

Do not confuse the criminal law test with the Use of Force Standard of Professional Behaviour in Schedule 2 to the Police (Conduct) Regulations 2020. The Police (Conduct) (Amendment) Regulations 2026 (SI 2026/597) replaced that paragraph with effect from 30 June 2026. It now reads: "Police officers only use force when they honestly believe this to be necessary. The force used should be necessary, proportionate and reasonable." The regulations extend to England and Wales, and regulation 3 says the amendment does not have effect for an allegation that came to attention before 30 June 2026, or a later allegation linked to the same matter that is still being handled under the old rules.

This changes the conduct test used in misconduct proceedings. It does not amend s.3 CLA 1967 or s.76 CJIA 2008, so whether an officer is guilty of an offence is still decided under the test above. We have not been able to check whether the Blackstone's edition for your sitting reflects the change, and the College examines the law as it appears in the Manuals for the sitting, so read the notice in your candidate handbook. Statutory text checked on legislation.gov.uk on 6 October 2026.

Why This Matters More At Supervisory Level

As a Sergeant or Inspector, you're increasingly the person reviewing a use-of-force report after the fact, briefing a team before a planned operation involving force, or giving evidence about whether a tactic was authorised appropriately. Understanding the test precisely, including which test is being applied (criminal law or conduct standard), is what lets you assess a colleague's use of force fairly, rather than substituting your own hindsight for their honest, in-the-moment judgement.

Frequently Asked Questions