Legal Studies

What Makes Conduct a 'Crime'?

Before examining categories, it is essential to establish what distinguishes a crime from a civil wrong. A crime is an act or omission that the state has prohibited because it is regarded as harmful to the community as a whole. The state — not the individual victim — prosecutes the offender, and the consequences include punishment rather than merely compensation.

Two foundational elements must ordinarily be proved by the prosecution beyond reasonable doubt:

• Actus reus — the prohibited physical act or omission (e.g. striking another person).
• Mens rea — the accompanying mental element, which may be intention, recklessness, or criminal negligence depending on the offence.

The requirement that both elements coincide is fundamental to criminal liability in NSW. For example, a surgeon who removes a diseased limb without consent commits the actus reus of assault, but lacks the mens rea of intention to harm — so no crime is established. Conversely, a person who intends to shoot their neighbour but accidentally fires into an empty field has the mens rea but not the completed actus reus of assault (though they may be liable for an attempted offence).

Understanding this dual requirement helps students avoid the common error of assuming any harmful act is automatically a crime: the law demands proof of both the deed and the fault element before the state can legitimately punish.

Offences Against the Person

This is the most immediately recognisable category of crime, encompassing conduct that directly harms or threatens the physical or psychological integrity of another human being. In NSW, the primary source of these offences is the Crimes Act 1900 (NSW).

Key sub-categories include:

• Homicide: Murder (s 18, Crimes Act 1900 (NSW)) requires proof of intent to kill or inflict grievous bodily harm; manslaughter covers unlawful killing without that intent (e.g. criminal negligence or provocation operating as a partial defence). Both are strictly indictable offences tried in the Supreme Court of NSW.
• Assault: The intentional or reckless act of causing another to apprehend immediate unlawful force. Common assault is a summary offence; assault occasioning actual bodily harm (s 59) and grievous bodily harm (s 33) are indictable.
• Sexual Offences: Sexual assault under s 61I requires proof that the accused had sexual intercourse with the complainant without consent, knowing the complainant was not consenting. These are strictly indictable, usually heard in the District Court.
• Robbery and Extortion: These offences involve force or threat against a person in conjunction with property-taking, bridging this category and property offences.

Applied example: Joel punches Marcus in a supermarket carpark, causing Marcus a broken nose. The actus reus is the punch; the mens rea is Joel's intention (or recklessness) to apply force. The broken nose constitutes actual bodily harm, making this an assault occasioning actual bodily harm under s 59 of the Crimes Act 1900 (NSW) — an indictable offence, though one that may be dealt with summarily in the Local Court under Schedule 1 of the Criminal Procedure Act 1986 (NSW) if both prosecution and defence consent and the Local Court considers it appropriate.