In NSW, intoxication is not a complete defence to a criminal charge. Being drunk or affected by drugs does not, on its own, excuse an offence. But evidence of intoxication can matter to whether the prosecution can prove you had the intent required for a “specific intent” offence, and involuntary intoxication (for example, a spiked drink) is treated more favourably and can sometimes lead to an acquittal.
Whether intoxication can be taken into account depends on the circumstances of the case, the source of the intoxication, and the offence charged.
Is Intoxication a Defence Under NSW Criminal Law?
Under NSW law, a person is intoxicated if they are under the influence of alcohol, a drug, or another substance (including prescription medication taken in excess or in unexpected circumstances). A person’s intoxication, whether caused by alcohol or drugs, may be relevant in assessing criminal conduct under NSW criminal law.
NSW law distinguishes between voluntary and involuntary intoxication, and between specific-intent and other types of offences,, as outlined in Part 11A of the Crimes Act 1900.
Intoxication is not, by itself, a complete defence to criminal conduct in NSW. However, it may influence criminal responsibility in specific legal circumstances. Its relevance depends on whether the offence is one of specific intent, and whether the intoxication was voluntary or involuntary.
Voluntary vs Involuntary Intoxication
This is the single most important distinction in the whole area. Whether your intoxication was self-induced or involuntary changes what the law will let you argue, and involuntary intoxication is treated far more leniently, because you did not choose to be in that state. In some cases, involuntary intoxication can lead to a full acquittal, something self-induced intoxication can never achieve.
What Counts as Self-Induced (Voluntary) Intoxication
Self-induced intoxication is intoxication you brought about yourself by consuming alcohol or drugs, including illicit drugs, when you knew, or ought to have known, they would have that effect. In other words, the intoxication was self-induced: you chose to drink or take the substance.
This is the ordinary situation of someone who has been drinking or taking drugs by choice, and it carries the heaviest restrictions under Part 11A. Voluntary intoxication of this kind will not, by itself, provide a defence to most charges, because the law does not readily excuse conduct where the intoxication was self-induced.
What Counts as Involuntary Intoxication
Intoxication is not self-induced where it results from circumstances beyond a person’s control. This may include situations where:
- A drink has been spiked;
- A person is intoxicated because of fraud or deception;
- A person consumes an intoxicating substance because of a reasonable mistake;
- Intoxication results from duress, force, or an emergency; or
- A person becomes intoxicated after taking medication in accordance with a valid prescription or recommended dosage instructions.
Where intoxication is not self-induced, the court may take that intoxication into account when determining whether the accused had the mental element required for an offence. Involuntary intoxication, where a person is forced or tricked into consuming alcohol or drugs, is treated more favourably in court compared to voluntary intoxication, as it indicates less personal responsibility for the impaired state of mind.
In some circumstances, a person may not be criminally responsible if the conduct giving rise to the offence resulted from involuntary intoxication.
Prescription Medication
Taking prescription medication at the directed dose, which then causes unexpected intoxication, may constitute involuntary intoxication. However, taking a higher dose than prescribed, or combining medication with alcohol against medical advice, is more likely to be treated as voluntary intoxication. Each case will depend on its specific facts.
Specific Intent vs Basic Intent Offences
The distinction between specific intent and basic intent criminal offences is central to how intoxication operates as a partial or complete defence in NSW. Intoxication can impact criminal liability for certain criminal offences, particularly those requiring a specific mental element (mens rea), but it does not affect the physical element (actus reus) of the offence.
Specific Intent Offences
An offence of specific intent is one that requires the prosecution to prove that the accused intended to bring about a particular result.
Examples of specific intent offences include intimidation, murder, wounding with intent, kidnapping, predatory driving, and a range of fraud and property offences.
For these offences, evidence of intoxication may be taken into account when determining whether the accused had the intention required for the offence. This applies whether the intoxication was self-induced or not.
However, intoxication will not be relevant if the accused formed the intention before becoming intoxicated, or became intoxicated in order to strengthen their resolve to commit the offence.
Basic Intent Offences
For offences that are not of specific intent, different rules apply. These offences are sometimes referred to as basic intent offences.
Where an accused is voluntarily intoxicated, the court must treat the accused as having been aware of any risk of which they would have been aware had they been sober. Therefore, Self-induced intoxication is not a defence for basic intent offences, which only require proof that the person voluntarily committed the act.
Where the intoxication was not self-induced, the court may take that intoxication into account when considering whether the prosecution has proved the required mental element.
How Intoxication Affects Criminal Responsibility in NSW
NSW law places significant limits on the circumstances in which intoxication can be relied upon in criminal proceedings. Intoxication does not automatically excuse criminal behaviour. Instead, the law restricts when evidence of intoxication can be considered when determining whether a person had the mental element required for an offence.
Under Section 428C of the Crimes Act 1900 (NSW), evidence of intoxication may be considered when determining whether the accused formed the requisite intent for specific-intent offences, but not for basic-intent offences. However, different rules apply to offences of specific intent.
Where a specific intent offence is charged, evidence of intoxication may be relevant in determining whether the accused formed the intention required for the offence. If the prosecution cannot prove that intention beyond a reasonable doubt, the accused may be acquitted of the specific intent offence.
In some cases, this may result in a conviction for a less serious alternative offence. For example, where a person is charged with murder and evidence of intoxication raises a reasonable doubt about whether they intended to kill or cause grievous bodily harm, they may be acquitted of murder but still convicted of manslaughter.
It is also important to understand that a successful argument based on intoxication does not necessarily avoid criminal liability altogether. Depending on the circumstances, an accused person may still be convicted of another offence and may still face a significant penalty, including imprisonment.
The Dutch Courage Rule
The “Dutch courage” rule provides that where a person intentionally becomes intoxicated in order to strengthen his or her resolve to commit a specific intent offence, evidence of that intoxication cannot be used to negate the intent required for that offence.
Under the Crimes Act 1900 (NSW), evidence of intoxication cannot be taken into account where a person:
- had already resolved to engage in the relevant conduct before becoming intoxicated; or
- became intoxicated in order to strengthen their resolve to engage in that conduct.
For example, if a person deliberately drinks to overcome inhibitions before committing an assault with intent to cause grievous bodily harm, they cannot later argue that their intoxicated state meant they lacked the necessary intent. The pre-formed intention to commit the offence, which existed before they consumed alcohol, is treated as subsisting throughout.
This rule reflects a broader principle in NSW criminal law: a person should not benefit from deliberately impairing their own capacity to form a criminal intent while simultaneously setting out to act on it.
The Reasonable Person Test
The reasonable person test in legal contexts assesses the actions of the accused against those of a sober individual, disregarding the accused’s intoxicated state.
In these situations, the court does not assess the accused’s conduct against the standard of a reasonable intoxicated person.
The practical effect is that a person cannot rely on their intoxication to lower the standard expected of them where criminal liability depends on an objective assessment of what a reasonable person would have thought, perceived, or done.
In other words, even if an accused was heavily intoxicated at the time of the alleged offence, the objective standard applied by the court remains that of a reasonable sober person.
Intoxication and Voluntary Conduct
Criminal liability generally requires that the accused’s conduct be voluntary. NSW law draws a distinction between self-induced intoxication and intoxication that is not self-induced when considering whether conduct was voluntary.
Where intoxication is self-induced, evidence of that intoxication cannot be relied upon to argue that the accused’s conduct was involuntary. In other words, a person cannot avoid criminal responsibility simply because they became so intoxicated that they later claim they were acting automatically or without conscious control.
Different considerations apply where the intoxication was not self-induced. If the accused’s conduct resulted from intoxication that was not self-induced, the legislation provides that the person is not criminally responsible for the offence.
Examples of intoxication that may not be self-induced include circumstances involving a spiked drink, fraud, a reasonable mistake, or intoxication resulting from medication taken in accordance with a lawful prescription or recommended dosage instructions.
Intoxication, Murder and Manslaughter
Murder is classified as an offence of specific intent under the Crimes Act 1900 (NSW). As a result, evidence of intoxication may be taken into account when determining whether the accused formed the mental state required for murder.
If evidence of intoxication raises a reasonable doubt about whether the accused intended to kill or cause grievous bodily harm, the prosecution may be unable to prove the offence of murder.
However, this does not necessarily mean that the accused will avoid criminal liability. In many cases, the issue becomes whether the accused is guilty of manslaughter instead.
Importantly, where a person is acquitted of murder because of self-induced intoxication, the legislation provides that evidence of that intoxication cannot then be taken into account when determining whether the person had the mental element required for manslaughter.
As a result, a person who successfully relies on intoxication to avoid a murder conviction may still be convicted of manslaughter and face a substantial term of imprisonment.
Expert Evidence in Intoxication Cases
Where Intoxication is relevant to a criminal charge, expert evidence may be used to assist the court in understanding the effects of alcohol, drugs, or medication on the accused at the relevant time.
Depending on the circumstances, expert evidence may be provided by a forensic toxicologist, psychiatrist, pharmacologist, or other appropriately qualified specialist. This evidence may address matters such as:
- blood alcohol concentration;
- the likely effects of alcohol or drugs on judgment, perception, and decision-making;
- the interaction of multiple substances; and
- Whether a prescribed medication or other substance may have caused an unexpected or adverse reaction.
The admissibility of expert evidence is governed by the Evidence Act 1995 (NSW). Expert opinion evidence may be admitted where it is based on specialised knowledge derived from a person’s training, study, or experience.
Expert evidence does not determine the outcome of a case. The ultimate question of whether the prosecution has proved the elements of the offence remains a matter for the jury or for the judge in a judge-alone trial. The expert’s opinion is simply one part of the evidence considered by the court.
What to Do if You've Been Charged With a Criminal Offence
If you have been charged, the single most useful thing you can do is get early legal advice. Getting the category of your charge right – specific intent or basic intent, self-induced or involuntary intoxication -is often decisive, and it is genuinely difficult to assess without knowing the law.
Hamilton Janke Lawyers is a consistently 5-star-rated criminal defence firm acting for clients across NSW, and our team can explain how these rules apply to your situation – contact our team.
