Refusing a Blood Test in the Northern Territory

By James Stevens, Director and Solicitor, Go To Court Lawyers. Last reviewed 14 April 2026.

The police in the Northern Territory have the power to test drivers to determine whether they have alcohol or drugs in their body. In some circumstances, a police officer may request that in addition to a breath or saliva test, a blood sample is provided. Refusing a blood test without a valid reason is an offence under the Traffic Act 1987 Northern Territory. This article deals with the offence of refusing a blood test in the NT.

Understanding your rights and obligations when it comes to blood testing is crucial for all Northern Territory drivers. The consequences of refusing a blood test can be severe, including significant fines, imprisonment, and licence disqualification. Whether you're facing charges for refusing a blood test or want to understand the legal requirements, this comprehensive guide covers everything you need to know about blood testing laws in the NT.

When can police require a blood sample?

Under the Northern Territory legislation, a police officer has the power to request any driver to provide a breath or saliva test. In addition if a police officer believes that you are under the influence of drugs and/or alcohol, you may be required to submit a blood sample for testing purposes.

In the event a blood sample is required, the police officer must make arrangements for the alleged offender to be taken to a hospital or other health care facility. The blood sample must be taken within four hours of the alleged incident.

Circumstances requiring blood tests

Police may require a blood test in several specific situations under the Traffic Act 1987 (NT). These include when a driver is suspected of driving under the influence of drugs, when breath testing equipment is unavailable or malfunctioning, or when a driver has been involved in a serious traffic accident. The officer must have reasonable grounds to believe that alcohol or drugs may be present in the driver's system.

Proper procedures for blood sampling

The law requires strict adherence to procedural requirements when obtaining blood samples. The sample must be taken by a qualified medical practitioner or registered nurse at an approved facility. Police must ensure the chain of custody is maintained, and the sample must be properly labelled and stored according to regulatory standards. Any deviation from these procedures may render the evidence inadmissible in court.

Offence of refusing a blood test

Under section 29AAH of the Northern Territory Traffic Act, it is an offence to refuse or fail to provide a blood sample.

The penalty for a first offence is a fine of up to 10 penalty units or imprisonment for up to 12 months.

The penalty for a second or subsequent offence is a fine of up to 20 penalty units to imprisonment for up to 12 months.

What constitutes refusal

Refusal to provide a blood sample can take various forms under Northern Territory law. This includes explicitly stating you will not provide a sample, failing to accompany police to a medical facility, or attempting to delay the process beyond the four-hour time limit. Even passive resistance or making excuses to avoid the test can be considered refusal.

Elements the prosecution must prove

For a successful prosecution, the court must be satisfied that police made a lawful request for a blood sample, that the defendant understood the request and its consequences, and that the refusal was deliberate and without lawful excuse. The prosecution must also demonstrate that proper procedures were followed and that the request was made within the prescribed time limits.

Disqualification from driving

In addition to the above penalties, a first time offender will be disqualified from driving for a period of at least 12 months. For any subsequent offences, the driver will be disqualified from driving for a period of at least 18 months.

An offence will be dealt as a second offence if the driver has previously been found guilty of one of the following offences;

• Driving with a confirmed breath or blood alcohol reading.
• Driving under the influence of drugs and/or alcohol.
• Failing to provide a breath sample.
• Failing to provide a blood sample. 

Impact on employment and lifestyle

A driving disqualification can have far-reaching consequences beyond the immediate inconvenience. Many employers require a valid driver's licence, and professional drivers may face termination. The inability to drive can affect your capacity to earn income, attend medical appointments, or fulfil family responsibilities, particularly in remote areas of the Northern Territory where public transport options are limited.

Alcohol ignition lock

If a person is disqualified from driving for a second time within a five year period, they will be permitted to drive only with an AIL (Alcohol Ignition Locking) licence for at least 12 months after the disqualification period has ended before applying for a standard licence. An AIL licence requires that a person's vehicle be fitted with an alcohol ignition locking system, which ensures the vehicle does not start if there is alcohol present in the driver's system.

Costs and maintenance of alcohol ignition locks

The installation and maintenance of an alcohol ignition locking device comes at significant personal expense. Drivers must pay for the initial installation, monthly monitoring fees, and regular calibration services. The device requires daily use and maintenance, and any attempts to tamper with or circumvent the system can result in additional penalties and extended AIL requirements.

Refusing a blood test defences

A person who is charged with refusing a blood test in the NT can rely on the legal defence that it would have been detrimental to their medical condition for a blood sample to have been provided at the time the request was made.

A person can also rely on the broader defence that there were reasonable grounds for failing to provide a blood sample at the time of the request.

Medical exemptions and conditions

Certain medical conditions may provide a legitimate defence to refusing a blood test. These include severe needle phobia, bleeding disorders, or conditions requiring blood-thinning medications. However, claiming a medical exemption requires proper medical documentation and expert testimony. The court will carefully scrutinise such claims to ensure they are genuine and not merely attempts to avoid testing.

Procedural defences

Defences may also arise from procedural failures by police or medical personnel. This includes situations where the four-hour time limit was not observed, where proper warnings were not given, or where the testing facility was not appropriately licensed. Legal representation is essential to identify and pursue these technical defences effectively.

Blood samples as evidence

A blood sample may be used as evidence that the person committed an offence.

If the blood sample was not taken in accordance with the rules set out in the legislation, however, it may be found to be inadmissible as evidence.

Chain of custody requirements

Maintaining an unbroken chain of custody is crucial for blood sample evidence to be admissible in court. This involves proper documentation at each stage, from collection to analysis, ensuring the sample's integrity and preventing contamination or tampering. Any gaps in the chain of custody can provide grounds for challenging the evidence's reliability and admissibility.

Court proceedings and legal representation

When charged with refusing a blood test in the Northern Territory, the matter will typically be heard in the Local Court. The prosecution carries