Defence of Honest and Reasonable Mistake of Fact: NSW Legal Guide

Key Takeaways

  • The defence applies to strict liability offences: It allows an accused to argue they held an honest and reasonable belief in facts that, if true, would make their actions lawful, such as speeding or drink-driving charges.
  • Three key elements must be proven: The belief must be honestreasonable, and relate to factual circumstances, not ignorance of the law, which is not a valid excuse.
  • Drug driving is excluded: As of 2024, drug driving is an absolute liability offence in New South Wales (NSW), meaning the defence of honest and reasonable mistake of fact no longer applies.
  • Evidence is critical: To succeed, the accused must provide documentation, witness statements, or expert opinions to substantiate their mistaken belief, making legal representation essential.

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Introduction

We all make mistakes — this is universally accepted. The NSW legal system recognises this too, so even if you make a big mistake and commit an illegal act, you may not be convicted. The defence of honest and reasonable mistake of fact is a crucial legal concept in New South Wales, particularly for individuals facing charges under strict liability offences. This defence allows an accused person to argue that they held an honest and reasonable belief in certain facts, which, if true, would have made their actions lawful. It is a vital tool for those charged with offences such as speeding, or drink-driving, where no criminal intent is required for a conviction.

This guide provides a comprehensive overview of the defence of honest and reasonable mistake of fact in NSW. It explains the legal basis of the defence, the elements that must be proven, and how it applies in real-world scenarios. By understanding this defence, individuals can better navigate the legal landscape and make informed decisions about their cases.

Understanding the Defence of Honest and Reasonable Mistake of Fact

What the Defence Means

Fundamentally, the defence of honest and reasonable mistake of fact allows an accused person to argue that they held a genuine and reasonable belief in certain facts which, if true, would render their actions lawful. Importantly, this defence concerns a mistaken belief about specific facts rather than ignorance of the law.

For example, if someone drives without realising their licence was suspended—because they never received the notification—they could raise this defence successfully.

The defence has three key elements:

ElementDescription
Honest BeliefThe accused must have genuinely and truly believed in the mistaken set of facts.
Reasonable BeliefA court must be satisfied that an ordinary person in the same situation would have held the same belief. The courts have an idea of “the reasonable person” — if someone’s beliefs do not align with this conception, it will be considered unreasonable. 
Fact vs. LawThe mistake must relate to factual circumstances, not to the legality of the action itself, as ignorance of the law is not an excuse.

When the Defence Applies in NSW

In New South Wales, this defence is available for strict liability offences, where proof of intent is not required. Normally, the prosecution must prove the “mens rea” (criminal intent) of the accused for them to be convicted. However, for strict liability offences, this intent is already presumed, and it is up to the accused and their defence lawyers to rebut this presumption – in other words, prove they didn’t have a criminal intent. 

 Typical offences include:

  • Speeding offences
  • Drink driving

Examples of its application might involve:

  • A driver charged with speeding due to a faulty speedometer, who genuinely believed they were within the limit.
  • A motorist who thought their blood alcohol concentration was under the legal threshold and drove accordingly.

It must be noted that until early February, drug driving was also a strict liability offence. However, in NSW, the court ruled in R v Narouz that drug driving is now an absolute liability offence. This means that if the physical element is proved, there is no defence of an honest and reasonable mistake — if you are caught driving under the influence of drugs, it will be an offence.

Ultimately, the accused must demonstrate that their belief was both honest and reasonable, and that if the facts they relied upon were correct, they would not be guilty. This ensures individuals are not unfairly convicted when they have a genuine, justifiable misunderstanding of the circumstances.

Legal Elements & Burden of Proof

Proving an Honest Mistake in the Offence

To successfully raise the defence of honest and reasonable mistake of fact, the accused must demonstrate that their mistaken belief was genuinely held. This is a subjective assessment, focusing on whether the accused truly believed in the mistaken facts.

For example, if someone was charged with driving while suspended but did not receive notification from the Roads and Maritime Services (RMS), they could argue an honest mistake—provided they genuinely believed their licence was valid.

Establishing a Reasonable Belief

The belief forming the basis of the mistake must be reasonable. In this stage, the court evaluates the belief objectively, considering whether an ordinary person in the same circumstances would have held it. Key factors include:

FactorDescription / Example
Steps taken to verify factsConsiders whether the accused made reasonable inquiries to confirm the situation.
Reliance on official notificationsInvolves circumstances such as relying on an RMS letter that was never received.
Circumstantial evidenceIncludes any other evidence that supports the reasonableness of the belief held by the accused.

Fact versus Law in the Mistake

The defence applies only to mistakes about facts, not mistakes about the law itself.

Type of MistakeLegal Standing
Mistake of factQualifies for the defence if the fact, had it been true, would have made the action lawful. For example, a faulty speedometer indicating to the driver that they were driving at the correct speed limit when they actually weren’t.
Mistake of lawDoes not qualify for the defence; for example, a belief that speeding was legal is an invalid excuse.

Establishing the Defence: Practical Guidance

Steps to Gather and Present Evidence

To successfully raise the defence of honest and reasonable mistake of fact, it is crucial to gather and present evidence that supports your claim. This involves several practical steps:

  1. Document the Circumstances
    First, keep a detailed record of the events leading up to the alleged offence. This includes any communications, notices or interactions relevant to your mistaken belief. For example, if you were not notified by the Roads and Maritime Services (RMS) about your licence suspension, gather all correspondence or note its absence.
  2. Gather Relevant Evidence
    Next, collect physical or documentary materials that support your belief, such as:
    • Witness Statements: Testimony from individuals who can corroborate your version of events.
    • Expert Opinions: Reports from professionals—for instance, mechanics validating a faulty speedometer.
    • Records and Notifications: Proof of any official communications, and any lack thereof, that contributed to your mistaken belief.
  3. Establish a Timeline
    Then, create a clear timeline of events to demonstrate when and how your mistaken belief was formed. This helps the court understand the context and reasonableness of your belief.
  4. Provide Context for Your Belief
    Finally, explain the basis of your mistaken belief. If you relied on a faulty speedometer, describe how you regularly maintained your vehicle and why you had no reason to doubt its accuracy.

By systematically gathering and presenting this evidence, you can build a robust case to support your defence.

How Defence Lawyers Can Assist You

Engaging experienced criminal defence lawyers is essential, as they play a critical role at every stage:

Area of AssistanceHow Lawyers Contribute
1. Advising on Legal RequirementsHelp you understand the legal elements required and ensure all necessary criteria for the defence are met.
2. Gathering and Presenting EvidenceAssist in collecting and organising the most impactful evidence and advise on the best presentation strategy.
3. Building a Robust CaseCraft a strong narrative that clearly demonstrates your honest and reasonable belief to the court.
4. Negotiating with ProsecutorsWhen appropriate, negotiate to reduce charges or penalties based on the strength of the defence.
5. Representing You in CourtAdvocate on your behalf, cross-examine witnesses, and present arguments to support your defence if the matter proceeds to trial.

The simplicity of this defence also means that it is often difficult to prove, especially in drink-driving cases. Furthermore, the courts have admitted that the definition of a “mistake” is ambiguous. By working with experiences defence lawyers such as those at Daoud Legal, you ensure your case is presented in the strongest possible light, maximising your chances of a successful outcome.

Conclusion

The defence of honest and reasonable mistake of fact is a vital legal tool for individuals facing strict liability offences in NSW, such as speeding or drink-driving. To successfully raise this defence, it is essential to prove that the mistaken belief was both honest and reasonable, and that it relates to factual circumstances rather than the legality of the action. This defence underscores the importance of understanding the distinction between mistakes of fact and law, as only the former can provide a valid excuse in court.

If you are facing charges and believe you may have a valid defence of honest and reasonable mistake of fact, it is crucial to seek expert legal advice. Contact our experienced criminal defence lawyers at Daoud Legal in Sydney to discuss your case and determine the best course of action. Our team is dedicated to helping you navigate the complexities of the law and ensuring your rights are protected.

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