NCA Criminal Law common mistakes
NCA Criminal Law · Understand the traps and how to avoid them.
Analyzing a fact pattern by picking out a single element (usually the actus reus) and declaring the offence made out, without separately working through mens rea, causation, and any defence for each charged offence.
Candidates pattern-match the facts to a familiar offence name and stop there, because law-school habits reward issue-spotting over systematic element-by-element proof; under time pressure the later elements get skipped entirely.
What to do instead
Before writing, build a short grid: for each candidate offence, list actus reus, mens rea, causation/attendant circumstances, then defences, and tick each box against a specific fact. Write only from the completed grid so no element is left unaddressed.
Treating mens rea terms as interchangeable, for example equating recklessness with negligence or 'knowingly' with 'intentionally', when applying the definition of the offence.
Everyday usage blurs these words, and candidates rely on memory of the offence label rather than the exact mental element stated in the provision; subjective/objective distinctions are especially easy to collapse.
What to do instead
Memorize a two-column table (subjective states: intention, knowledge, recklessness as to risk; objective state: negligence) with a one-line test for each. When applying an offence, quote the mental element from the definition and match it to the table before discussing facts.
Confusing justification defences (self-defence, necessity, defence of property) with excuse defences (duress, insanity, automatism), and therefore misallocating the burden and the effect on third parties.
Both categories are taught together as 'defences' and the labels look similar on the page; candidates recall the name of the defence but not its doctrinal placement or who must prove what.
What to do instead
Learn a three-part framework for each defence: (1) category (justification/excuse), (2) who bears the evidential and persuasive burden, (3) effect if successful (acquittal, partial defence reducing liability, or no offence at all). Drill by sorting a list of ten defences into the categories from memory.
Answering inchoate and party-liability questions by describing the completed offence and then adding a bare sentence that the accused is 'also liable as an accomplice or for attempt', without identifying the conduct element specific to the inchoate or accessorial mode.
Candidates know the headline offence best and run out of time or analytical energy for the secondary liability layer, so they append it as a conclusion rather than proving it.
What to do instead
For attempt, always state the three-part test (intent to commit the offence, conduct that is more than merely preparatory, and the absence of completion) and apply each. For complicity, prove aid/abet/encourage plus the required mental element, and address withdrawal if facts suggest it. Allocate at least one full paragraph to each secondary mode.
Misapplying the chain of causation by asserting that any intervening act breaks it, or that any pre-existing vulnerability relieves the accused, without testing whether the intervening act was free, deliberate, and informed and whether the original injury remained an operating and substantial cause.
The 'novus actus' phrase is memorable and gets applied as a slogan; candidates do not distinguish victim conduct, third-party conduct, and medical treatment, each of which has a different threshold.
What to do instead
Use a fixed checklist: (1) factual causation (but-for), (2) legal causation (operating and substantial cause), (3) intervening act test (free, deliberate, informed; foreseeable victim response; grossly negligent medical treatment only). Address each category of intervener expressly instead of asserting a conclusion.
Skipping the actus reus requirement of voluntariness and treating omissions as automatically sufficient, rather than establishing a duty to act before discussing breach.
Fact patterns often emphasize the failure to help; candidates jump to breach and causation because the omission feels obviously culpable, and the duty question is less familiar.
What to do instead
Whenever conduct is an omission, write a sentence identifying the source of duty (statute, contract, special relationship, voluntary assumption of care, creating a dangerous situation) and cite the facts supporting it before analyzing breach. If no duty source exists, say so and explain why liability fails.
Conflating the defences of intoxication, automatism, and insanity, or applying intoxication to offences where it is irrelevant because the offence requires only negligence or has no corresponding mens rea requirement.
All three defences involve altered mental states, and candidates remember the names but not the trigger conditions or the voluntary/involuntary distinction.
What to do instead
Build a decision tree: was the condition caused by an external substance (intoxication) or an internal condition (insanity/automatism)? Was it voluntary? Is the offence one of specific or basic intent? Then state the consequence (acquittal, partial defence, or no effect). Practice by classifying five short scenarios into the correct branch.
Failing to apply the special-part rules for homicide, such as the year-and-a-day rule, the requirement that the victim be a live human being, or the distinction between murder and manslaughter based on malice aforethought versus provocation or diminished capacity.
Homicide is the most heavily taught topic, so candidates assume familiarity and recite the general definition without checking the threshold conditions or the partial defences that reduce the charge.
What to do instead
For every homicide question, first confirm the victim was a living person and the death occurred within the required period, then classify the mental state (intent to kill, intent to cause serious harm, reckless indifference, felony murder), then check each partial defence in turn. Write the classification step explicitly even when it seems obvious.
Ignoring the specific wording of the statutory provision and answering from general memory of the offence name, so that a required circumstance element (for example, that property belonged to another, or that the victim was a public officer) is never proven.
Candidates study from summaries and case names rather than the text of the provision, and the exam question supplies facts that do not match their remembered version of the offence.
What to do instead
During preparation, for each tested offence write out the statutory elements verbatim on a one-page card and test yourself by covering the text. In the exam, underline each element in the question stem and check the facts against each underlined phrase before drafting the answer.
Presenting conclusions without authority, or citing authority that does not support the proposition, instead of naming the governing rule or case for each legal proposition asserted.
Time pressure pushes candidates toward assertion, and memorized case names are often attached to the wrong rule because they were learned as labels rather than as holdings.
What to do instead
Adopt a rule-proof pattern for every paragraph: state the rule, cite the provision or case that establishes it in one clause, then apply it to the facts. Keep a short list of ten core authorities with a one-line holding each and rehearse matching rule to authority until the pairing is automatic.