Alcohol Interlock Device Required in ACT - When, Costs and Exemptions

By James Stevens, Director and Solicitor, Go To Court Lawyers. Last reviewed 10 April 2026.

In the ACT, alcohol interlock devices become mandatory if you're convicted of drink driving with a blood alcohol concentration (BAC) of 0.08 or higher, or if you refuse a breath test. The interlock must remain installed for at least 12 months for first offenders, extending to 24 months for repeat offences within 5 years. You cannot legally drive any vehicle without an approved interlock during your disqualification period - doing so risks immediate arrest, further licence suspension, and potential imprisonment.

Do You Need a Lawyer?

Yes, absolutely. Interlock requirements follow automatically from drink driving convictions, but a lawyer can challenge the underlying charge, argue for exemptions, or negotiate alternative penalties before conviction. Without legal representation, you'll face the full mandatory penalties including interlock installation, licence disqualification, fines up to $3,200, and potential imprisonment.

The stakes are enormous. A drink driving conviction with interlock requirements affects your employment, insurance costs, and ability to drive for work or family emergencies. Many people don't realise that certain exemptions exist - but courts rarely grant these without proper legal argument and supporting evidence.

Go To Court Lawyers has successfully challenged interlock requirements by disputing breath test procedures, proving medical exemptions, or achieving alternative sentencing outcomes. Call 1300 636 846 immediately if you're facing drink driving charges that could trigger interlock requirements.

What Happens Next - The Process

1. Court conviction: ACT Magistrates Court convicts you of drink driving (BAC 0.08+) or breath test refusal
2. Licence disqualification: Immediate driving ban for 6-12 months minimum before interlock eligibility
3. Interlock approval: Apply to Access Canberra for interlock licence after serving initial disqualification
4. Provider selection: Choose approved installer (Guardian Interlock, Smart Start, or Draeger)
5. Installation appointment: Interlock fitted to your vehicle at approved service centre
6. Monthly services: Mandatory calibration and data download every 28-35 days
7. Compliance period: Complete 12-24 months without violations or failed tests
8. Removal application: Apply to Access Canberra for unrestricted licence restoration

The entire process typically takes 18-36 months from initial conviction to full licence restoration. Any violations or failed tests restart your compliance period, potentially adding years to your interlock requirement.

The Law in Australian Capital Territory

The Road Transport (Driver Licensing) Act 1999 (ACT) and Road Transport (Safety and Traffic Management) Regulation 2000 govern interlock requirements. Under Section 73A of the Act, interlocks are mandatory for:

• BAC 0.08-0.149: 12-month interlock period (first offence)
• BAC 0.15 or higher: 24-month interlock period (first offence)
• Repeat offences within 5 years: 24-month interlock period regardless of BAC
• Refusing breath test: 24-month interlock period

Penalties for driving without required interlock include:

• Fine: Up to $3,200
• Licence disqualification: Additional 6-12 months
• Imprisonment: Up to 6 months
• Vehicle impoundment: Immediate 28-day seizure

The legislation provides limited exemptions under Section 73B, but courts interpret these very strictly. Most self-represented defendants fail to meet exemption criteria because they don't understand the specific legal tests courts apply.

Mistakes to Avoid

1. Assuming hardship automatically grants exemption
Courts receive dozens of hardship applications weekly. Simply needing your car for work, family care, or medical appointments won't satisfy exemption criteria. You need detailed evidence proving no reasonable alternative transport exists and that interlock installation is genuinely impossible - not just inconvenient.

2. Driving someone else's car during interlock period
Your interlock licence restricts you to vehicles fitted with approved devices. Driving any other vehicle - including family cars, work vehicles, or rentals - triggers immediate licence cancellation and criminal charges. Many people incorrectly believe they can drive other cars for emergencies or work.

3. Using mouthwash, medications, or eating before tests
Interlock devices detect any alcohol, including trace amounts from mouthwash, cough medicine, or certain foods. Failed tests due to "innocent" consumption still count as violations. Three failed tests within 30 days restart your entire compliance period - potentially adding 12-24 months to your requirement.

4. Missing monthly service appointments
Skipping calibration appointments by even one day locks your vehicle until service completion. Courts treat missed appointments as serious compliance failures. Some magistrates extend interlock periods for repeated service violations, viewing them as attempts to circumvent monitoring.

5. Attempting device tampering or circumvention
Interlock providers immediately report tampering attempts to Access Canberra and police. This includes asking others to provide breath samples, covering the camera, or disconnecting wiring. Tampering often results in additional criminal charges and automatic interlock period extensions.

Likely Outcomes and Costs

Without a lawyer, expect full mandatory penalties including 12-24 month interlock requirements, licence disqualification, and maximum fines. Self-represented defendants rarely succeed with exemption applications or alternative sentencing arguments.

With experienced legal representation, outcomes improve significantly:

• Charge dismissals: Challenging breath test procedures, police conduct, or equipment calibration
• Reduced penalties: Negotiating shorter disqualification periods or work licence alternatives
• Exemption success: Properly documented medical, vehicle, or extreme hardship exemptions
• Section 10 dismissals: No conviction recorded, avoiding interlock requirements entirely

Interlock costs include:

• Installation: $220-$350
• Monthly service: $150-$200 (mandatory every 28-35 days)
• Removal: $100-$150
• Total 12-month program: $2,500-$3,200
• Total 24-month program: $4,500-$5,800

Legal representation typically costs $2,000-$4,000 but often saves much more through reduced penalties or successful exemptions. The potential savings in interlock costs, insurance premiums, and employment impacts usually far exceed legal fees.

How Go To Court Lawyers Can Help

Go To Court Lawyers operates Australia's largest legal network with over 800 experienced lawyers across every state and territory. Our ACT drink driving specialists appear daily in ACT Magistrates Court, maintaining strong working relationships with magistrates, prosecutors, and court staff.

Our track record includes:

• Successfully challenging breath test procedures and equipment calibration
• Achieving Section 10 dismissals that avoid conviction and interlock requirements
• Securing medical and hardship exemptions through proper documentation and expert evidence
• Negotiating work licences and alternative penalties

We understand the real-world impact of interlock requirements on your employment, family responsibilities, and financial situation. Our lawyers know which arguments work in ACT courts and which magistrates grant exemptions under what circumstances.

With a 4.5-star rating from over 780 reviews, our clients consistently report better outcomes than expected. We offer fixed-fee consultations for $295, giving you complete cost certainty from day one.

Don't face interlock requirements alone. Our 24/7 hotline 1300 636 846 connects you immediately with experienced ACT drink driving lawyers. Alternatively, book your consultation online at gotocourt.com.au/book or request urgent help if your court date approaches.

Time is critical - the earlier we intervene, the more options remain available. Call now and let Australia's most experienced drink driving legal team fight for the best possible outcome in your case.