
Driving under the influence of alcohol is a serious offence in Ireland, with the country introducing a new penalty system in 2018 to expedite the processing of these offences. The legal breath alcohol limit in Ireland is 22 micrograms of alcohol per 100 millilitres of breath for experienced drivers and 9 micrograms per 100 millilitres of breath for other drivers. This limit is enforced through roadside breath testing by the Gardaí, who are authorised to perform random breath testing at mandatory alcohol checkpoints. Refusing to comply with a Garda's request for testing is considered an offence and may result in arrest without a warrant. The penalties for drink-driving in Ireland include fines, disqualification from driving, and imprisonment for repeated or serious breaches.
| Characteristics | Values |
|---|---|
| Breath Alcohol Limit | 22 microgrammes (µg) of alcohol per 100 millilitres of breath for experienced drivers |
| 9 microgrammes (µg) of alcohol per 100 millilitres of breath for other drivers | |
| Blood Alcohol Limit | 50 milligrams (mg) of alcohol per 100 millilitres of blood for all drivers |
| 20 milligrams (mg) of alcohol per 100 millilitres of blood for learner or newly qualified drivers (for a period of two years after passing their driving test) or professional drivers | |
| Blood Alcohol Content (BAC) Limit | 0.05 grams per litre (g/l) or 50 milligrams (mg) for all drivers |
| 0.02 grams per litre (g/l) or 20 milligrams (mg) for specified drivers | |
| Blood Alcohol Concentration (BAC) Limit | 80 milligrams (mg) of alcohol per 100 millilitres of blood |
| Breath Alcohol Concentration (BrAC) Limit | 35 microgrammes (µg) of alcohol per 100 millilitres of breath |
| Drug Driving Laws | Zero tolerance for the presence of cocaine, cannabis, methamphetamine, MDMA, and other illegal drugs |
| Random Breath Testing | Allowed at mandatory alcohol checkpoints approved by the Garda Inspector |
| Refusal to Comply | May result in arrest without a warrant |
| Offences | Driving in a public place while intoxicated and consuming more than the permitted amount of intoxicants (alcohol or drugs) |
| Penalties | Automatic fines, disqualification from driving for a set period, and potential prison sentences for repeated or serious breaches |
| Fixed Penalty Notice | Issued if the driver's licence is valid, with no previous drink-driving offences in the preceding three years, and the fine is paid within 28 days |
| Maximum Penalty | €5,000 or 6 months in prison, or both |
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What You'll Learn
- The legal blood alcohol limit in Ireland is 80mg of alcohol per 100ml of blood
- The breath alcohol limit is 22 micrograms of alcohol per 100ml of breath
- For novice drivers, the blood alcohol limit is 50mg/100ml
- Gardaí can perform random breath testing at mandatory alcohol checkpoints
- Refusing to take a breath test is an offence and may result in arrest

The legal blood alcohol limit in Ireland is 80mg of alcohol per 100ml of blood
In Ireland, it is illegal to drive in a public place if you are too intoxicated to have proper control of your vehicle or have consumed more than the permitted amount of an intoxicant, which can be alcohol, drugs, or both. The Gardaí, or the Irish police, enforce this law by carrying out roadside breath and saliva testing.
Breathalysers are devices that estimate blood alcohol content from a breath sample. They can be configured to express alcohol levels in either microgrammes of alcohol in breath or BAC%. It is important to familiarise yourself with one unit of measurement and stick to it for consistency.
If you are found to be driving over the legal limit in Ireland, the Gardaí will either issue a fixed penalty notice or summon you to appear in the District Court to answer the charge of drink driving. If you pay the fine within 28 days, you will not have to go to court, but an additional penalty will be imposed. For a first offence, the minimum disqualification period is four years, and for a second offence, it is six years. The maximum penalty is a €5,000 fine, six months in prison, or both.
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The breath alcohol limit is 22 micrograms of alcohol per 100ml of breath
In Ireland, it is illegal to drive in a public place if you are too intoxicated to have proper control of your vehicle or have consumed more than the permitted amount of alcohol. The Gardaí, or the Irish police, enforce this law by carrying out roadside breath testing for alcohol levels and saliva testing for drug levels.
The legal limit in Ireland is in line with European levels and is expressed in several different units of measurement for breath and two different modes of measurement for blood. The limit is the same across these units of measurement, but the specific unit used depends on the type of breathalyser. The units of measurement for breath are microgrammes of alcohol per 100ml of breath (µg/100ml) and, for blood, the units are milligrams of alcohol per 100ml of blood (mg/100ml) or BAC%.
The penalties for drink-driving vary depending on the amount of alcohol detected in your system and whether it is your first offence. If you are convicted of drink-driving, you will be automatically fined and disqualified from driving for a set period. Repeated or serious breaches may result in a prison sentence. If you are below the legal limit, you will not be penalised.
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For novice drivers, the blood alcohol limit is 50mg/100ml
In Ireland, it is illegal to drive in a public place if you are too intoxicated to have proper control of your vehicle or have consumed more than the permitted amount of an intoxicant. The current legal blood alcohol concentration (BAC) limit in Ireland is 50 milligrams (mg) for all drivers and 20mg for specified drivers. Specified drivers include learner or newly qualified drivers (for a period of two years after passing their driving test) or professional drivers (of buses, goods vehicles and public service vehicles). This means that for novice drivers, the blood alcohol limit is 50mg/100ml.
The BAC limit is expressed in different units of measurement, including microgrammes of alcohol in breath (µg/100ml), milligrams of alcohol in blood (mg/l), or as a percentage of BAC. The limit remains the same but is just expressed differently. Breathalysers can be configured to express your alcohol levels in either microgrammes of alcohol in breath or BAC%.
In Ireland, the Gardaí carry out roadside breath testing for alcohol levels and saliva testing for drug levels. It is an offence to refuse to be tested. If you are convicted of driving under the influence of alcohol or drugs, you will be fined and disqualified from driving for a set period. Repeated or serious breaches may result in a prison sentence.
The new penalty system, introduced on 26 October 2018, allows for faster processing of offences and avoids the need to appear in court. However, this is only applicable if your license is fully valid, you have no previous drink-driving offences in the preceding three years, and you pay your fine within 28 days.
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Gardaí can perform random breath testing at mandatory alcohol checkpoints
In Ireland, it is illegal to drive in a public place if you are too intoxicated to have proper control of your vehicle or have consumed more than the permitted amount of an intoxicant. An intoxicant can be alcohol, drugs, or both. The Gardaí, or the Irish police, enforce this law by carrying out roadside breath testing for alcohol levels and saliva testing for drug levels.
The legal blood alcohol limit in Ireland is 50 milligrams (mg) for all drivers, and 20mg for specified drivers, such as learner or newly qualified drivers, or professional drivers. This is equivalent to 22 micrograms (µg) of alcohol per 100 millilitres of breath for an experienced driver and 9µg per 100ml of breath for other drivers.
To measure blood alcohol content (BAC), the Gardaí use breathalysers, which analyse a breath sample to estimate how much alcohol is in a person's bloodstream. Breathalysers can be configured to express alcohol levels in either microgrammes of alcohol in breath or BAC%.
In 2006, an amendment was made to the Traffic Act allowing the Gardaí to perform random breath testing at mandatory alcohol checkpoints without needing to provide a reason for the testing. These checkpoints must be approved in writing by the Garda Inspector and can be set up in public places. At these checkpoints, the Gardaí can stop any mechanically propelled vehicle, including motorbikes, electric bicycles, and wheelchairs. Anyone who refuses to comply with the Gardaí may be arrested without a warrant.
Random breath testing can also be conducted without an authorised checkpoint if a Garda has reason to believe that a driver is under the influence of alcohol due to committing a traffic offence or being involved in an accident.
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Refusing to take a breath test is an offence and may result in arrest
In Ireland, the legal blood alcohol limit for driving is 50 milligrams of alcohol per 100 millilitres of blood (0.05% BAC) for all drivers, and 20mg for specified drivers, such as learner drivers, newly qualified drivers, or professional drivers. The limit for alcohol in breath is 22 micrograms of alcohol per 100 millilitres of breath for experienced drivers and 9 micrograms per 100 millilitres of breath for other drivers.
The Gardaí can also conduct breath tests without an authorised checkpoint if they have reason to believe that a driver is under the influence of alcohol. For example, if a driver commits a traffic offence or is involved in an accident, the Gardaí can require them to take a breath test.
The penalties for refusing a breath test are the same as those for drink-driving offences. Under the Road Traffic Act 2006, all convictions for drink-driving result in a mandatory disqualification from driving. The minimum disqualification period for a first offence is four years, and six years for a second or subsequent offence. The maximum penalty for drink driving is a fine of €5,000, six months in prison, or both.
It is important to note that the penalties for drink-driving offences in Ireland can vary depending on the specific circumstances, such as the amount of alcohol detected in the driver's system and whether it is the driver's first offence. The court may also impose additional penalties, such as requiring the installation of a breathalyser in the vehicle or random drug and alcohol testing.
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Frequently asked questions
The drink-drive limit in Ireland is 22 micrograms of alcohol per 100 millilitres of breath for experienced drivers and 9 micrograms of alcohol per 100 millilitres of breath for other drivers.
If you are convicted of driving under the influence of alcohol or drugs, you will be fined and disqualified from driving for a set period. If it is not your first offence, you may be sentenced to prison.
The BAC limit is 50 milligrams for all drivers and 20 milligrams for learner or newly qualified drivers, or professional drivers.
The Gardaí carry out roadside breath testing for alcohol levels using a breathalyser, which measures the amount of alcohol in your breath and estimates how much is in your bloodstream.
It is an offence to drive in a public place in Ireland if you are too intoxicated to have proper control of your vehicle or have consumed more than the permitted amount of alcohol or drugs.











































