Comprehensive Criminal Law Notes for A-Level

Fatal Offences: Murder and Defences

Murder might seem straightforward, but the legal definition is quite specific. It's the unlawful killing of a reasonable person with malice aforethought (intention to kill or cause serious harm). The prosecution must prove both that the defendant caused the death and intended serious consequences.

Causation is often where murder cases get complicated. Courts use the 'but for' test - would the victim have died anyway? Then they check if the defendant's actions were a substantial cause of death. Things like medical treatment going wrong or the victim's own actions might break this chain, letting the defendant off the hook.

Intention comes in two forms. Direct intention means you actually wanted to kill someone, whilst oblique intention means you knew death was virtually certain, even if you didn't specifically want it. Both count for murder, which is why throwing a brick off a motorway bridge can be murder even if you claim you didn't mean to kill anyone.

Top Tip: Remember that malice aforethought doesn't require planning - it just means intention to kill or cause GBH at the moment of the act.

When murder charges seem too harsh, defendants often argue loss of control. This partial defence requires losing self-control due to fear of violence or circumstances that would make anyone feel seriously wronged. Sexual infidelity alone won't work as a trigger, and you can't plan revenge then claim loss of control later.

Diminished Responsibility and Manslaughter Types

Diminished responsibility offers another route to reduce murder to manslaughter. You need an abnormality of mental functioning from a recognised medical condition that substantially impaired your ability to understand your actions, make rational judgements, or exercise self-control.

The key word is "substantially" - it's not total impairment, but definitely more than trivial. Conditions like epilepsy, battered woman syndrome, or severe depression can qualify, but you'll need proper medical evidence to back up your claim.

Unlawful act manslaughter happens when you commit a dangerous criminal act that kills someone, even if you never intended serious harm. The act must be criminal (not just a civil wrong), and any reasonable person would recognise it risked some physical harm to others.

Remember: The harm only needs to be 'some harm' - it doesn't have to be serious injury or death for the act to qualify as dangerous.

Gross negligence manslaughter covers situations where you owe someone a duty of care but breach it so badly that it's criminal. Think doctors, parents, or anyone with a contractual duty. The breach must create a serious and obvious risk of death, and be so exceptionally bad that it deserves criminal punishment.

Non-Fatal Offences: Assault to GBH

Non-fatal offences follow a clear hierarchy based on the level of harm caused. Assault is the lowest level - just making someone fear immediate unlawful force. You don't need to actually touch them; even words or silence can count if they create genuine fear.

Battery involves actual unlawful touching, however slight. Even brushing someone's clothes counts, and it can be indirect (like setting a trap) or through omission (like not warning someone about needles in your pocket when they search you).

Section 47 assault requires actual bodily harm - any hurt that interferes with health or comfort. This includes brief unconsciousness, cutting hair, or even serious psychiatric injuries. Importantly, you only need the intention for basic assault or battery; you don't need to intend the actual harm caused.

Key Point: Psychiatric injuries count as actual bodily harm, but mere emotions like fear or distress don't make the grade.

Section 20 covers wounding (breaking the skin with visible bleeding) or inflicting grievous bodily harm (really serious harm). Section 18 is the most serious non-fatal offence, requiring specific intention to cause GBH or resist arrest. The difference in sentencing is massive - S20 carries 5 years maximum, whilst S18 can mean life imprisonment.

Property Offences: Theft and Its Elements

Theft seems simple until you break it down. You need five elements: dishonest appropriation of property belonging to another with intention to permanently deprive. Each element has caught out countless defendants who thought they were safe.

Appropriation is any assumption of an owner's rights - touching, moving, even just offering to sell someone else's property. You can appropriate property with the owner's consent (like accepting an overly generous gift from a vulnerable person) or by doing authorised acts for unauthorised purposes.

Property covers almost everything you'd expect - money, objects, even body parts in some cases. However, you can't steal confidential information, wild plants (unless for commercial purposes), or wild animals (unless they're ordinarily kept in captivity).

Watch Out: You can steal your own property if someone else has a legal interest in it - like taking your car back from a garage before paying the bill.

Belonging to another is broader than ownership. Anyone with possession, control, or a proprietary interest counts. If you're given money to pay bills but spend it on yourself, that's theft. If your employer overpays you by mistake and you keep it knowing it's wrong, that's also theft.

Dishonesty follows the Ivey test - would ordinary decent people consider your behaviour dishonest given what you knew or believed? The law gives you three get-out clauses: believing you have a legal right, thinking the owner would consent, or believing the owner can't be found by taking reasonable steps.

Robbery and Burglary

Robbery is basically theft plus force or the threat of force. You need a complete theft first - if the theft fails, there's no robbery. The force must be used immediately before or during the theft, and it's for the jury to decide what counts as "force" (though a gentle nudge usually won't cut it).

The force doesn't have to be used on the person you're stealing from, and threats of future violence don't count - it must be immediate. Even unsuccessful attempts to frighten someone can work if you intended to put them in fear of immediate force.

Burglary comes in two flavours. Section 9(1)$a$ is entering as a trespasser with intent to steal, cause GBH, or commit criminal damage. Section 9(1)$b$ is entering as a trespasser and then actually stealing or inflicting GBH once inside.

Important: You only need partial entry for burglary - getting your arm through a window is enough if it allows you to steal something.

The building must be substantial and relatively permanent (so a tent won't do), but it includes parts of buildings like going behind a shop counter. Trespassing means entering without permission or going beyond what you were allowed to do. Having a key doesn't help if you're entering to commit crimes the owner wouldn't have consented to.

Mental Capacity Defences: Insanity and Automatism

Mental capacity defences can completely excuse criminal behaviour, but they're narrowly defined and hard to prove. Insanity follows the old M'Naghten rules and requires three elements that seem outdated but are still applied today.

You need a defect of reason from a disease of the mind that means you didn't know what you were doing or didn't know it was legally wrong. The "disease of the mind" is a legal concept, not medical - it covers internal conditions like epilepsy, diabetes, or sleepwalking, even if they're temporary.

Automatism covers involuntary acts caused by external factors - being attacked by bees, hit by a hammer, or given drugs without your knowledge. You must have total loss of control and be completely blameless for your condition.

Crucial Distinction: Internal causes (like epilepsy) lead to insanity, whilst external causes (like being hit) lead to automatism. The consequences are very different.

The automatism defence leads to complete acquittal, whilst insanity gives a special verdict that can still result in detention. This explains why defendants often prefer to argue automatism, even when their condition is clearly internal and should technically count as insanity.

Intoxication as a Defence

Intoxication can provide a defence, but only in limited circumstances that depend on how you got intoxicated and what type of crime you committed. The law tries to balance personal responsibility with the reality that alcohol and drugs can genuinely affect mental capacity.

Voluntary intoxication (choosing to drink or take drugs) can only help with specific intent crimes like murder, and only if you were so intoxicated that you genuinely couldn't form the required intention. A drunken intention is still an intention, so being drunk doesn't automatically get you off.

Involuntary intoxication (spiked drinks, unexpected reactions to prescribed medication) can potentially excuse both specific and basic intent crimes, but again only if it prevented you from forming the necessary mental state.

Key Rule: For basic intent crimes like assault or manslaughter, voluntary intoxication is never a defence because getting drunk is itself seen as reckless behaviour.

The distinction between specific and basic intent crimes is crucial. Specific intent crimes require intention as their mens rea (like murder, theft, or burglary with intent). Basic intent crimes can be committed recklessly (like assault, battery, or unlawful act manslaughter). If you can't use intoxication as a defence to the specific intent crime, you'll likely be convicted of a basic intent alternative instead.