Wrongful Arrest vs False Imprisonment in Australia: What’s the Difference?

Being arrested or held against your will is frightening, and it is even worse when you believe it should never have happened. Many Australians who go through this search for answers and find two terms used almost interchangeably: wrongful arrest and false imprisonment.

The terms overlap, but they are not the same thing. A wrongful arrest is one way false imprisonment can happen. False imprisonment is the broader legal wrong that covers any unlawful restraint of your liberty, whether it lasts five minutes or five years.

Drawing on insights from Paramount Law, an Australian compensation law firm that acts in wrongful arrest and unlawful detention matters, this guide explains what each term means under Australian law, how they differ, what you need to show to bring a claim, and what compensation may be available.

What is wrongful arrest?

A wrongful arrest happens when someone takes you into custody without the legal authority to do so. Most often this involves police, but it can also involve security guards, border officers or members of the public making a “citizen’s arrest”.

Police powers to arrest are set by state and territory law. In New South Wales, for example, the Law Enforcement (Powers and Responsibilities) Act 2002 (NSW) lets police arrest without a warrant only when two conditions are met:

1. The officer suspects on reasonable grounds that you are committing, or have committed, an offence.
2. The officer is satisfied the arrest is reasonably necessary for a listed purpose, such as stopping the offence continuing, preventing you from fleeing, confirming your identity, protecting evidence or protecting someone’s safety.

If either condition is missing, the arrest may be unlawful. Arresting someone for a minor, old offence when a court attendance notice would have done the job is a common example.

An arrest can also become wrongful if officers use more force than is reasonably necessary, fail to tell you why you are being arrested, or keep holding you after the legal reason for the arrest has ended.

Wrongful arrest is not a separate cause of action in Australian civil law. When you sue over an unlawful arrest, the claim is usually brought as false imprisonment, often alongside assault, battery or malicious prosecution.

What is false imprisonment?

False imprisonment is an intentional tort, meaning a civil wrong, committed when someone directly and intentionally restrains your freedom of movement without lawful justification.

Despite the name, it does not require a prison cell. You can be falsely imprisoned in:

• the back of a police car or a holding cell
• a shop’s back office, where a security guard keeps you
• an immigration detention centre
• a locked room, a vehicle or even an open space, if you are not free to leave

The restraint must be complete. If you could reasonably have walked away by another route, it is usually not false imprisonment. The restraint also does not need to be physical: a credible threat of force, or an assertion of authority you reasonably feel you must obey, can be enough.

False imprisonment is “actionable per se”. You do not need to prove you suffered financial loss or injury. The loss of your liberty is the harm the law recognises.

Wrongful arrest vs false imprisonment: the key differences

The simplest way to think about it: every wrongful arrest leads to false imprisonment, but not every false imprisonment starts with an arrest.

	Wrongful arrest	False imprisonment
What it is	Being taken into custody without legal authority	Any unlawful, complete restraint of your liberty
Legal status	A description of what happened, not a separate tort	A recognised tort you can sue for
Who is usually involved	Police, security guards, citizens making an arrest	Police, prison and immigration authorities, private businesses, individuals
Does it need an arrest?	Yes	No: it can arise from detention, overstayed sentences or being locked in
How long it lasts	Starts at the moment of arrest	Covers the whole period you were held unlawfully
Typical claim	Brought as false imprisonment, often with assault or malicious prosecution	Brought on its own or with related claims

One more point matters in practice. A lawful arrest can turn into false imprisonment later. If police hold you longer than the law allows before charging or releasing you, or a prison keeps you past your release date, the detention can become unlawful from that point on.

Common examples in Australia

Wrongful detention cases in Australia tend to fall into a few familiar patterns:

• Arrest without reasonable grounds. Police arrest someone on a hunch, mistaken identity or weak information, with no reasonable basis to suspect an offence.
• Unnecessary arrest. Police arrest someone for a minor matter when issuing a notice to attend court would have been enough.
• Security guard detention. A shopper is held in a back room on suspicion of shoplifting. Private guards have only limited powers of arrest, and holding someone without good grounds can amount to false imprisonment, as the Victorian case Myer Stores Ltd v Soo (1991) showed.
• Overstayed custody. A person is held in police custody beyond the time allowed, or kept in prison after their sentence should have ended because of an administrative error.
• Immigration detention. People are held in immigration detention without lawful authority. In August 2025, the Commonwealth Ombudsman found Home Affairs had wrongfully detained 11 people in a single year, including an Australian citizen, with one person held for 18 months because of an administrative error.

Immigration detention claims have changed significantly in recent years. In June 2026, the High Court unanimously rejected the Commonwealth’s argument that it was immune from compensation claims by people it had detained unlawfully. That decision opened the way for former detainees, including many released after the 2023 NZYQ ruling, to sue for false imprisonment.

Paramount Law, which acts for refugees and asylum seekers in unlawful immigration detention claims, notes that these cases can succeed where detention was not authorised by law or was carried out improperly. They are also legally complex, so early specialist advice matters.

What you need to prove, and what the other side can argue

False imprisonment is unusual because the burden shifts quickly. You generally need to show:

1. You were restrained. Your freedom of movement was completely restricted, physically or by an assertion of authority.
2. The restraint was direct and intentional. The person or organisation you are suing caused it on purpose, not by accident.

Once you establish those points, it is generally up to the defendant to prove the detention was lawfully justified. That is a significant advantage for people bringing a claim.

Common defences include:

• Lawful authority. The arrest or detention was authorised by legislation, a warrant or a court order, and every legal requirement was followed.
• Reasonable suspicion. The officer honestly held a suspicion based on reasonable grounds at the time, even if it later proved wrong.
• Consent. You agreed to stay, for example by voluntarily going to a police station to help with inquiries.
• Necessity. The restraint was needed to prevent immediate harm.

An acquittal does not automatically mean the arrest was unlawful. The question is whether the arrest and detention were legally justified at the time, based on what the officers knew then.

Compensation and time limits

Compensation for false imprisonment depends on how long you were held, how you were treated and the effect it had on you. Courts may award:

• General damages for the loss of liberty, humiliation, distress and damage to your reputation
• Special damages for financial losses such as lost wages and medical or counselling costs
• Aggravated damages where the detention was carried out in a high-handed, insulting or humiliating way
• Exemplary damages in serious cases, to punish and deter outrageous conduct by authorities

According to Paramount Law, the losses a wrongful detention claim may cover include emotional distress, the loss of liberty itself, harm to reputation, lost income, and the cost of medical or psychological treatment.

The amount is not automatic. In Lewis v Australian Capital Territory (2020), the High Court held that a person who would have been lawfully detained anyway may receive only nominal damages, even though the detention itself was unlawful.

Time limits also matter. Each state and territory sets its own limitation periods. For intentional torts such as false imprisonment, the period is often six years, but a shorter period, commonly three years, can apply where you claim damages for personal injury. Courts can sometimes extend these deadlines, but only in limited circumstances, so it is best to get advice early.

What to do if you think you were wrongfully detained

If you believe you were wrongfully arrested or unlawfully held, these steps can protect your position:

1. Write everything down while it is fresh: dates, times, locations, officer names or badge numbers, and what was said.
2. Collect evidence, including photos of any injuries, medical records, and details of witnesses or CCTV cameras nearby.
3. Request your records. You can apply for police or government records about your arrest or detention under freedom of information laws.
4. Keep records of your losses, such as missed work, medical bills and counselling sessions.
5. Get legal advice early. Limitation periods apply, and evidence such as CCTV footage can be deleted quickly.

These claims are often brought against police, state governments or the Commonwealth, which have significant legal resources. Paramount Law, with offices in Sydney, Brisbane and Perth, handles wrongful detention claims for people who have been falsely arrested, held beyond their sentence or unlawfully held in immigration detention. The firm offers a free case assessment, no-win-no-fee representation and translators for clients who prefer to speak in their own language.

Frequently asked questions

Is wrongful arrest the same as false imprisonment?

No. A wrongful arrest is one way false imprisonment can happen. False imprisonment is the broader legal claim and covers any unlawful restraint of your liberty, with or without an arrest.

Can I sue the police for wrongful arrest in Australia?

Yes. Claims are usually brought against the state or territory government responsible for the police force, and are framed as false imprisonment, often with assault, battery or malicious prosecution.

Do I have to be locked in a cell to be falsely imprisoned?

No. Being held in a car, an office or any place you are not free to leave can be enough, as long as the restraint is complete.

Can a security guard legally detain me?

Only in limited circumstances, such as when they reasonably believe you have committed an offence. Holding you without proper grounds, or for longer than needed to hand you to police, may be false imprisonment.

Can I claim if I was later found not guilty?

Possibly. An acquittal alone does not prove the arrest was unlawful, but it may support a claim if the arrest or detention lacked a proper legal basis.

How long do I have to make a claim?

It depends on your state or territory and the type of damages claimed. Six years is common for false imprisonment, but personal injury claims often have a three-year limit, so seek advice early.

Who can help with a wrongful detention claim in Australia?

Related: Sigal Law Firm Criminal Defense Services and Legal Guidance

Compensation lawyers who specialise in false imprisonment and unlawful detention can assess your case. Paramount Law, handles wrongful arrest, false imprisonment and immigration detention claims from its offices in Sydney, Brisbane and Perth, on a no-win-no-fee basis.