South Australia's Mandatory Alcohol Interlock Scheme (SA MAIS) requires drivers convicted of serious drink-driving offences to fit an alcohol interlock device to their vehicle for a period equal to their licence disqualification, before that licence can be reinstated. The scheme is administered by Service SA (Department for Infrastructure and Transport) and applies after the disqualification period has been served. Understanding how South Australia's alcohol interlock laws work, and how SA's approach differs from other states, is the first step to completing the programme with confidence.
Who Must Join the SA Mandatory Alcohol Interlock Scheme
South Australia's interlock scheme is triggered by serious drink-driving offences defined under section 81E of the Motor Vehicles Act 1959 (SA). The following offences make participation mandatory:
- High-range blood alcohol concentration (BAC) of 0.15 or above (category 3 offence)
- A second or subsequent offence with a BAC above 0.08 (category 2), where the previous offence occurred within the five years prior
- Refusing to provide a breath or blood sample for alcohol testing
- Driving under the influence (DUI)
For first-time mid-range offenders (BAC 0.08 to 0.149), the magistrate has discretion to impose an interlock condition, though this is not automatic.
| Offence | Mandatory? | Interlock Period |
|---|---|---|
| First high-range (BAC 0.15+) | Yes | Equals disqualification (min 3 months) |
| Second drink-driving (BAC 0.08+, within 5 years) | Yes | Equals disqualification |
| Refusing breath/blood test | Yes | Equals disqualification |
| Driving under the influence | Yes | Equals disqualification (up to 36 months) |
| First mid-range (BAC 0.08 to 0.149) | Court discretion | Varies |
| Low-range first offence (under 0.08) | No | Not applicable |
Source: Motor Vehicles Act 1959 (SA) s 81E
One advantage of the SA MAIS that is often missed: participants are exempt from the requirement to undergo a drug or alcohol dependency assessment under section 79B of the Motor Vehicles Act 1959 (SA). The SA Law Handbook confirms this exemption, which simplifies the reinstatement process compared with some other states.
How SA's Interlock Period Works (Why It's Different)
The defining feature of South Australia's scheme is that the interlock period mirrors the disqualification period exactly. Most participants going through the programme are surprised by this: if your disqualification was six months, your interlock period is six months. There is no fixed minimum term separate from the disqualification, unlike NSW (which sets periods at 12, 24 or 48 months) or WA (which uses a six-month base plus a performance window).
The minimum period under the SA scheme is three months, even if the disqualification was shorter. The maximum is 36 months, which applies to the most serious and repeat offences. The interlock period begins only after the disqualification is fully served and the participant applies to Service SA to have the interlock condition applied to their reinstated licence.
Breaching interlock conditions during the period can extend the programme and attract additional penalties. Understanding how alcohol interlock devices work before installation helps participants avoid common compliance errors.
Step-by-Step Process for SA Participants
Getting through the SA MAIS follows a clear sequence. Each step must be completed before moving to the next.
- Court conviction: A magistrate issues a mandatory interlock order (or exercises discretion for mid-range first offenders).
- Serve the disqualification: No driving is permitted during the disqualification period.
- Apply to Service SA: Once the disqualification ends, apply for licence reinstatement with the interlock condition applied.
- Pay the administration fee: Service SA charges a fee at the reinstatement stage. Confirm the current amount directly with Service SA, as fee schedules are updated periodically.
- Book device installation: Contact an approved interlock service provider to schedule installation. The device must be fitted before you can legally drive again.
- Attend regular service appointments: Monthly calibration and data downloads are a programme condition, not optional.
- Complete the period without violations: All readings, rolling retests and service appointments must be compliant throughout.
- Apply for removal and full reinstatement: Submit a completion certificate to Service SA to have the interlock condition removed and your full licence restored.
What SA Interlock Participants Need to Know About Violations
The interlock device threshold is set at 0.02 BAC, not zero, to account for trace ethanol from certain foods and medications. Any reading at or above 0.02 counts as a fail. Participants should avoid alcohol completely when driving and allow adequate time after eating or using mouthwash before providing a breath sample.
Violations that can extend the programme or trigger penalties include:
- A failed start attempt (breath sample at or above 0.02)
- Missing a rolling retest prompt while driving
- Tampering with or interfering with the device
- Missing a scheduled calibration service appointment
Under section 81H of the Motor Vehicles Act 1959 (SA), breaching any interlock scheme condition carries a maximum penalty of $2,500. Assisting a licence holder to breach the conditions carries the same maximum penalty. Driving without a licence after committing a serious drink-drive offence attracts a maximum of $5,000 or one year's imprisonment.
Costs for SA Interlock Participants
The cost of fitting and maintaining the device is the participant's responsibility. Eligible concession card holders can access a concession scheme, so contact Service SA to confirm current eligibility criteria before installation. Approximate costs for 2026:
| Cost Item | Approx. Amount |
|---|---|
| Device installation | $200 to $300 |
| Monthly calibration service | $150 to $220/month |
| Device removal | $150 to $200 |
| Service SA administration and reinstatement fees | Confirm with Service SA |
| Annual total (indicative, 12-month period) | $2,200 to $3,800 |
Can You Get an Exemption from the SA Interlock Requirement?
Exemptions from the SA MAIS are available in limited circumstances but are not automatic. Participants must apply formally with supporting evidence.
Medical exemption: A certified medical condition that physically prevents safe use of an interlock device may qualify. A medical practitioner must assess and document the condition, and the application goes through Service SA.
No vehicle access: If you do not own or have regular access to a nominated vehicle, contact Service SA to discuss your circumstances. The scheme has some administrative flexibility for genuine no-vehicle situations.
There is no general financial hardship exemption in the SA scheme. If your circumstances may support an exemption, seek legal advice before applying, as procedural requirements apply and exemptions are assessed case by case.
Frequently Asked Questions
What is the South Australian Mandatory Alcohol Interlock Scheme?
The SA MAIS is a road safety programme requiring drivers convicted of serious drink-driving offences to install an approved alcohol interlock device before their licence can be reinstated after disqualification. It is governed by the Motor Vehicles Act 1959 (SA) and administered by Service SA, part of the Department for Infrastructure and Transport.
How long is the interlock period in SA?
The interlock period equals the disqualification period, with a minimum of three months and a maximum of 36 months. This is different from states that use fixed minimum terms regardless of the disqualification length.
How do I apply for the SA alcohol interlock programme?
After serving your full disqualification period, apply to Service SA to have an interlock condition applied to your reinstated licence. Then book installation with an approved interlock provider before driving again.
What is the alcohol interlock device cost in SA?
Installation costs from $350, monthly servicing runs from $150, and removal is about $150 to $200. Service SA administration and reinstatement fees apply separately. Total costs for a 12-month period range from $2,200 to $3,800, depending on the provider and the period length.
Can I get an alcohol interlock exemption in SA?
Medical exemptions are available where a certified condition physically prevents device use. No-vehicle-access cases may also qualify. Exemptions require a formal application with supporting evidence and are not granted automatically.
What happens if I breach my SA interlock conditions?
Breaching any condition of the scheme carries a maximum fine of $2,500 under section 81H of the Motor Vehicles Act 1959 (SA). Assisting someone to breach their conditions carries the same penalty. Breaches can also extend the interlock period and may result in further licence disqualification.
Getting Started in South Australia
South Australia's Mandatory Alcohol Interlock Scheme provides a clear path back to full licence reinstatement. The key is that the interlock period matches your disqualification and begins only after that disqualification ends. Completing each step on time, attending every service appointment and staying within the 0.02 threshold keep the period on track.
Affordable Interlock Systems is expanding its network of approved ALCOLOCK installations nationwide. Call 1-800-252-656 or visit our service locations page to check availability in your area.
For official scheme details, refer to the Department for Infrastructure and Transport SA MAIS information sheet and the SA Law Handbook entry on the mandatory interlock scheme.
