Obligations · Rights · Options · Discussion 03
Am I detained, or am I free to leave?
You do not have to hear the words “you are under arrest” before the law starts asking whether your liberty has been restricted.
New Zealand appellate authority has recognised that detention can arise where, because of official words or conduct, a person reasonably believes they are not free to leave. That is why one of the most useful questions in an encounter is also one of the simplest.
“Am I being detained, or am I free to leave?”
Detention is not the same thing as questioning
A person can be spoken to, questioned or asked to wait without necessarily being legally detained. Equally, a person can be detained without having been formally arrested.
The Court of Appeal has described detention as existing where, as a result of official conduct, a person reasonably believes they are not free to leave. That means the legal character of the encounter can turn on what was said, what was done, whether departure was blocked, whether non-compliance was threatened with arrest, and the surrounding circumstances.
Conversation
You are being spoken to or asked questions, but remain free to end the interaction and leave.
Detention
Your liberty has been restricted under an enactment, or official conduct would cause a reasonable person to believe they are not free to leave.
Arrest
A formal exercise of arrest power. Arrest without warrant requires statutory authority; section 315 of the Crimes Act states that no one may be arrested without warrant except under that Act or another enactment expressly giving that power.
Unlawful or arbitrary detention
A restriction on liberty that lacks lawful authority, exceeds the power relied upon, or is otherwise arbitrary can engage section 22 of the New Zealand Bill of Rights Act.
Your first option: force the status to become clear
Once you are detained, additional rights activate
Section 23 of the New Zealand Bill of Rights Act is practical. It does not merely announce a principle. It gives a detained person specific options.
You can require the reason. A person arrested or detained under an enactment must be told why at the time of the arrest or detention.
You can ask for a lawyer. You have the right to consult and instruct a lawyer without delay and to be informed of that right.
You can challenge the legality of detention. Section 23(1)(c) expressly recognises the right to have the validity of the arrest or detention determined without delay by habeas corpus and to be released if it is not lawful.
If the detention is for an offence or suspected offence, you can refrain from making a statement. Section 23(4) protects that right and requires that you be informed of it.
You must be treated humanely. Section 23(5) applies to everyone deprived of liberty.
Arrest requires legal authority
Section 315 of the Crimes Act states the starting rule for arrest without warrant: it must be authorised by that Act or by another enactment expressly conferring the power.
That is especially important during public activity such as a march, protest or hīkoi. Peaceful assembly is protected by section 16 of the Bill of Rights, but that does not immunise a person from every lawful arrest power. Equally, the fact that an individual is arrested does not answer whether the arrest power actually existed or whether its statutory conditions were satisfied.
Section 316 of the Crimes Act also places duties on a person making an arrest, including informing the arrested person of the act or omission for which they are being arrested, subject to limited exceptions such as impracticability or where the reason is obvious in the circumstances.
Your options if you believe the detention is unlawful
Habeas corpus is not just a historic phrase
People often hear “habeas corpus” without being told what it actually does.
Section 6 of the Habeas Corpus Act says an application for a writ may be made to challenge the legality of a person's detention. Section 7 allows the application to be made to the High Court and preserves the High Court's ability to deal with an oral application in circumstances of unusual urgency. Section 9 requires priority and urgency.
That is an option. It is a judicial mechanism specifically designed to test whether a person may lawfully continue to be detained.
“Am I free to leave? If not, what is the legal basis for detaining me? I want to speak to a lawyer now.”
What not to do
Do not assume that not hearing the word “arrest” means you are free to leave. Detention can arise before formal arrest.
Do not assume that being told “you are detained” makes the detention lawful. The legal source, trigger and scope still matter.
Do not assume that peaceful protest prevents any detention or arrest. The question is whether a lawful power exists and has been exercised within its limits.
Do not assume that an arrest automatically validates everything that happens afterwards. Force, questioning, search, treatment and continued detention are separate legal questions with their own limits.
The question “Am I free to leave?” identifies the moment when an encounter may have become an exercise of coercive state power. From there, your options change.
Primary and official sources
New Zealand Bill of Rights Act 1990 — ss 16, 22 and 23 ↗
Crimes Act 1961, s 315 — arrest without warrant ↗
Crimes Act 1961, s 316 — duties of persons arresting ↗
Habeas Corpus Act 2001 — ss 6–9 ↗
Court of Appeal Report 2002 — R v Koops summary on detention ↗
Legislation and official court material checked on 31 August 2026. The lawfulness of any detention depends on the exact facts and the statutory power relied upon.