H418/01 - Crime, liability and proof

Crime and its sources

A crime is behaviour prohibited by criminal law and liable to criminal punishment through criminal proceedings. It is treated as a public wrong even when its immediate victim is one person. A civil wrong, such as negligent damage to a neighbour's fence, ordinarily concerns a claim for a remedy between parties. One incident can produce both criminal proceedings and a civil claim; success in one does not automatically decide the other.

Criminal rules come from statute, valid delegated legislation, and common law developed through binding decisions. Parliament defines criminal damage in section 1 of the Criminal Damage Act 1971. Murder remains a common-law offence; legislation has altered its surrounding rules and defences. A statutory offence still needs judicial interpretation. A court's interpretation of a word such as “reckless” can determine the mental element Parliament requires.

Do not treat everything offensive as criminal. Breaking a promise to a friend is usually neither an offence nor a legally enforceable agreement. Conversely, conduct can be criminal without everyone regarding it as immoral: regulatory offences may control activities for public safety. Identify an actual offence and its legal source before asking whether the facts satisfy it. Legality requires an accessible, sufficiently certain legal basis; public disapproval cannot supply a missing offence.

Elements of liability

Liability depends on proving the elements of the particular offence, rather than proving that the accused is a bad person.

The actus reus is the external element: prohibited conduct, any required circumstances and, for a result offence, the required consequence and causation. The mens rea is the required fault element, such as intention or recklessness concerning specified external elements. Different offences require different fault; some impose strict liability for at least one element. A defence may prevent liability even when the offence elements are otherwise established.

Section 1(1) of the Criminal Damage Act 1971 illustrates the structure: destruction or damage of property belonging to another, without lawful excuse, with intention to damage such property or recklessness as to that damage. “It broke” is not enough: whose property was it, what did the accused do, and what fault can be proved? The prosecution need not show a wish to break the particular item if the legally required recklessness is present.

Original worked example: Lena deliberately cracks a borrowed vase because she wants revenge. The crack supports damage; the borrowing supports ownership by another; deliberately cracking it supports intention. Revenge is her motive, the reason she acted, rather than an additional element of basic criminal damage. If a sudden involuntary spasm knocks it over, the same damage does not by itself prove a voluntary act or intention/recklessness. If Lena has an applicable lawful excuse, that must also be addressed. Later lessons develop these rules separately.

Parties, burden and standard

The prosecution alleges and presents the case against the defendant; the defence challenges that case and may raise a defence or other explanation. The CPS conducts most public prosecutions in England and Wales, but is not the only possible prosecutor. Neither an accusation nor a charge proves guilt. The court determines the legal questions; the tribunal of fact evaluates the evidence under the applicable directions.

The legal burden asks who must prove an issue. The standard of proof asks how convincing that proof must be. Ordinarily the prosecution must prove guilt beyond reasonable doubt, commonly explained to a jury as being sure. This is not a numerical percentage and does not require the removal of every imaginable doubt. The defendant ordinarily does not have to prove innocence.

In Woolmington v DPP [1935] AC 462, the defendant said the shooting of his wife was accidental. The trial direction wrongly placed on him the burden of showing an absence of malice once the killing was proved. The House of Lords quashed the murder conviction and confirmed the prosecution's general burden, subject to recognised exceptions. The decision concerns proof, not a rule that every claimed accident must be accepted.

An evidential burden is different: enough evidence must raise an issue fit for consideration. Evidence raising self-defence can come from the prosecution's witnesses as well as the defendant. Once properly raised, the prosecution ordinarily must disprove it to the criminal standard. Simply asserting “self-defence” without evidence is insufficient; showing evidence that raises the issue is not the same as proving the defence on a balance of probabilities.

Reverse burdens and fairness

A reverse onus places a burden on the defendant for a specified issue instead of following the usual prosecution burden.

Some exceptions impose a legal burden: the defendant must establish the specified matter on the balance of probabilities, meaning more likely than not. The insanity defence is a common-law exception. Statutes can create others. This does not transfer every element of the offence to the defendant or require the defendant to disprove the whole prosecution case.

Under Road Traffic Act 1988 section 5(1)(b), being in charge of a motor vehicle on a road or other public place while over the prescribed alcohol limit is an offence. Section 5(2) provides a defence if the defendant proves there was no likelihood of driving while still over the limit. In Sheldrake v DPP [2004] UKHL 43, the House of Lords upheld that legal burden as proportionate. The prosecution still has to establish the offence; the particular exonerating matter is especially connected with the defendant's knowledge and plans.

Article 6(2) of the European Convention on Human Rights protects the presumption of innocence. A legal reverse burden can permit conviction despite doubt concerning the exonerating issue, so its justification needs scrutiny: the offence's seriousness, the public interest, access to evidence and the burden's extent matter. Human Rights Act 1998 section 3 requires compatible interpretation so far as possible. In the conjoined terrorism appeal in Sheldrake, the burden was read as evidential. Thus “the statute says prove” does not always settle how the burden operates, and “all reverse burdens violate human rights” is also too broad.

Aims of criminal law

Criminal law aims to protect people and society, but different purposes can point toward different choices.

Deterrence seeks to discourage offending, either by the individual or by others. Protection can justify restricting dangerous behaviour and incapacitating serious offenders. Rehabilitation seeks to reduce future offending by changing behaviour. Retribution treats proportionate punishment as a deserved response to wrongdoing, while denunciation publicly expresses condemnation. These are reasons for criminal law and punishment; none guarantees that a particular penalty achieves its aim.

Original example: criminalising dangerous interference with safety equipment protects potential victims before injury occurs. A deterrence argument supports a clear prohibition and credible enforcement. Yet an extremely severe penalty for a minor accidental interference may be disproportionate, damage rehabilitation and deter reporting. Increased severity is not automatically increased effectiveness: certainty of detection and the offender's circumstances matter.

Criminal law also resolves public wrongs through organised procedures instead of private retaliation. A prosecution can vindicate the public interest even if an individual victim forgives the offender. On the other hand, punishment imposes serious costs on defendants, families and society. Alternatives, including civil remedies or regulation, may sometimes address harm with less coercion. Analyse whether an aim is served in the particular context instead of listing aims as if they never conflict.

Principles and criminalisation

Deciding what should be criminal requires an argument about the limits of state coercion.

The harm principle, associated with J. S. Mill, supports interference to prevent harm to others rather than merely to impose a majority's morality on competent adults. This protects autonomy but creates questions about indirect harms and their seriousness. Legal moralism allows the preservation of shared morality to justify prohibitions; its weakness is that disagreement may turn minority conduct into an offence without demonstrable injury. Paternalism supports intervention to protect people from their own harmful choices; it can be stronger where a person lacks information or meaningful freedom, but risks overriding informed adult autonomy.

The fault principle supports punishment according to blameworthiness, while proportionality relates the severity of coercion to wrongdoing and harm. Strict liability and negligence create tensions with a strong subjective-fault approach. Minimum criminalisation asks whether criminal punishment is necessary when other measures could work. These principles are analytical positions, not automatic statutory defences.

Original argument: a proposed prohibition on a hazardous activity done privately by informed adults may be justified if it endangers neighbours or emergency workers. That is a harm-based argument. If there is no credible external risk, support based only on disapproval is moralist; protection of the adults themselves is paternalist. A reasoned judgement should test those factual assumptions and compare less restrictive safeguards, rather than announce that autonomy always wins. Connect this to proof: careful definitions and a demanding standard reduce wrongful punishment, but may make enforcement harder. That is a genuine tension between protection and liberty.

Quick recap

Identify the offence and its source, separate its external and fault elements, and determine who must prove each disputed issue. Arguments about criminalisation need reasons about harm, autonomy, blame and the practical effects of punishment.