Carrying a Knife in Queensland — What Is a Lawful Excuse?
Weapons — 2026-06-23 — by Sacha Sarah Smith, Civic Law
Charged with carrying a knife in public in Queensland? Section 51 of the Weapons Act 1990, the five categories of reasonable excuse, what does not count.
You were carrying a knife — your work knife, a pocketknife, a fishing knife, a multitool — and now you are facing a charge under section 51 of the Weapons Act 1990 (Qld). The charge is possessing a knife in a public place without a reasonable excuse.
The offence itself is simple: you had a knife in a public place. The question that decides whether you are guilty or not is whether you had a lawful reason to have it on you at the time.
The Offence
Section 51(1) makes it an offence to physically possess a knife in a public place or a school, unless you have a reasonable excuse.
"Public place" is defined broadly in the Act — it means any place the public is entitled to use, is open to the public, or is used by the public. Roads, footpaths, parks, shopping centres, licensed venues, and anywhere else with public access. Section 51(8) goes further: a vehicle that is in or on a public place is itself a public place. A knife in your car on a public road is a knife in a public place.
"Physically possess" means the knife was on your person, in your bag, in your vehicle, or otherwise within your immediate physical control. You do not need to have it in your hand.
"Knife" also has a broader meaning than you might expect. Under section 51(8), it includes any thing with a sharpened point or blade that is reasonably capable of being held in one or both hands and being used to wound someone. This catches items beyond traditional knives — box cutters, certain tools, bladed instruments that are not sold as knives but have a sharpened edge or point.
Penalties
The maximum penalties are:
First offence: 50 penalty units (currently $8,635) or 18 months imprisonment
Second or later offence: 100 penalty units ($17,270) or 2 years imprisonment
If you posted about the offence on social media — advertising your involvement or the act itself — the penalties increase significantly: 100 penalty units or 2 years for a first offence, and 150 penalty units or 30 months for a second offence.
These are maximum penalties. Most first offenders do not receive imprisonment. But the gap between a fine and a jail sentence is real — and so is the difference between a conviction being recorded and a no-conviction order . Both turn on how the matter is presented to the court.
What Counts as a Reasonable Excuse
Section 51(3) sets out four categories of lawful reason for carrying a knife in a public place, and section 51(5) adds a fifth. If your reason fits one of them, you have a defence:
Work — section 51(3)(a). You carry the knife to perform a lawful activity, duty, or employment. A tradesperson with a utility knife on their belt, a chef transporting kitchen knives, a farm worker carrying a knife for primary production. The knife must have a genuine connection to the work you are doing or travelling to and from.
Recreation or sport — section 51(3)(b). You carry the knife to participate in a lawful entertainment, recreation, or sport. A fisher with a fillet knife, a scout with a knife as part of uniform, a diver with a diving knife. The recreational purpose must be genuine and current — not something you did last week.
Lawful exhibition — section 51(3)(c). You are exhibiting the knife at a fete, market, or other public gathering. Less common, but it is in the Act.
General lawful purpose — section 51(3)(d). You are using the knife for a lawful purpose. The Act specifically mentions two examples: preparing or cutting food at a picnic, and carrying a penknife or Swiss army knife for its normal utility purposes. A small folding knife or multitool carried as a genuine everyday utility item falls within this category.
Genuine religious purposes — section 51(5). This applies in public places only — not in schools. The Act gives the example of a Sikh carrying a kirpan to comply with their religious faith.
Self-Defence Is Not a Reasonable Excuse
This catches people. Section 51(4) says it explicitly: carrying a knife for self-defence is not a reasonable excuse. It does not matter that you feel unsafe, that you have been threatened, or that you live in an area where you feel you need protection. If self-defence is the reason you had the knife, you do not have a defence under this section.
How the Court Assesses Your Excuse
Having a reason that fits one of the five categories is necessary — but it is not always enough. Section 51(7) says the court may also consider the way the knife is held in possession, and when and where it is held , and whether that would cause a reasonable person concern about being threatened or harmed.
This is where most cases are won or lost. A work knife on your belt during your shift is straightforward. The same knife on the same belt at a nightclub at midnight is a different situation. The court looks at the whole picture — the time, the location, the type of knife, the way it was carried, and what you were doing when you were found with it.
A small folding knife in a backpack on the way home from a fishing trip is very different from a large fixed-blade knife in a waistband at a train station.
The Work Knife Problem
The most commonly contested knife charge involves tradespeople and outdoor workers. A landscaper carrying a work knife in the CBD after hours. A fisherman with a fillet knife in a car. An electrician with a utility knife clipped to a belt at a pub.
Whether the "work" excuse holds up depends on how close the connection is between the knife and the work at the time you were found with it . Carrying your work knife during or immediately before or after work is one thing. Carrying it hours later at a venue with no connection to your job is another. The further removed you are from the work activity — in time, location, and context — the weaker the excuse becomes.
"I Forgot It Was in My Bag"
This is one of the most common explanations — and one of the weakest. The offence is one of physical possession. The Act does not require you to have known the knife was there. Forgetting you have a knife on you is not listed as a reasonable excuse.
That said, if the knife was genuinely connected to a lawful purpose (for example, a work knife left in a bag after a shift) and the circumstances support that explanation, the underlying lawful purpose may still provide a defence — but "I forgot" on its own, without a connected lawful reason, is not enough.
The Burden of Proof
The prosecution must prove two things: that you physically possessed a knife, and that you did so in a public place or a school. Once that is established, the evidential burden shifts to you to raise a reasonable excuse. You do not have to prove your excuse on the balance of probabilities — you only need to point to evidence that raises it as a realistic possibility.
Once you have raised it, the prosecution must then disprove the excuse beyond reasonable doubt . If the prosecution cannot exclude the possibility that you had a lawful reason, you should be acquitted.
If You Are Charged
The practical question is whether to contest the charge or plead guilty. If you had a genuine lawful reason and the circumstances support that reason — the right knife, the right time, the right context — contesting the charge may be the right course. If the circumstances are against you, a guilty plea with proper submissions on penalty may produce a better result than losing a contest.
What you say to police when they find the knife matters. The explanation you give at the time becomes part of the evidence. If you have a genuine lawful reason, saying so clearly and consistently from the outset strengthens the defence. If you give no explanation, or give one that does not match the circumstances, that creates problems later.
Talk to Civic Law
If you have been charged with carrying a knife in a public place, the question is whether you have a defence — and if not, how to present the matter to get the best available outcome. Sacha can review the circumstances, assess whether a reasonable excuse applies, and advise on the best way forward. Call Sacha Sarah Smith on 0425 429 458 .
Weapons Offence — Plea
Contested Hearing — Magistrates Court