
Idaho has specific laws regarding alcohol consumption, particularly when it comes to drinking and driving. The legal blood alcohol concentration (BAC) limit in Idaho is 0.08% for drivers aged 21 and above, with stricter limits for commercial drivers at 0.04% and zero tolerance for those under 21, with a limit of 0.02%. Driving under the influence of alcohol is a serious offence in Idaho, with penalties including heavy fines, license suspension, and even jail time for repeat offenders. The state also prohibits the sale of alcohol on certain days and to anyone under the age of 21.
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What You'll Learn

Idaho's legal blood alcohol limit for drivers over 21
Idaho has specific laws regarding alcohol consumption and driving. Driving under the influence (DUI) of alcohol is a serious crime, with more than 39% of Idaho's traffic fatalities involving motorists driving under the influence.
For drivers over 21 in Idaho, the legal blood alcohol limit is 0.08%. This is the same limit at which a driver will face adult DUI charges. This limit is also known as blood alcohol content or blood alcohol concentration (BAC). This refers to the amount of alcohol in an individual's blood at a given time and is considered the most accurate way to determine intoxication.
While a BAC of 0.08% is the legal limit, most people will appear normal with a BAC between 0.010 and 0.029%. However, at 0.08% and above, people will begin to appear visibly impaired, with symptoms including exaggerated emotions, impaired reflexes and reaction time, and staggering or slurred speech.
If a driver in Idaho refuses to take a BAC test, their driver's license will be confiscated for one year, and they will be fined $250. If convicted of a DUI, there will be additional fines of $1,000, and the driver may be asked to attend a drug and alcohol awareness program. If a driver's BAC is 0.20% or higher, they will face enhanced penalties, including a minimum of 10 days in jail for a first offence.
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Under-21s drinking and driving laws
In Idaho, it is illegal for anyone under the age of 21 to buy or possess alcohol. Under-21s are also prohibited from entering a bar without a lawful business purpose, such as working as a musician or singer. It is also illegal for anyone to sell or give alcohol to anyone under 21 or to allow them to drink alcohol in a licensed establishment.
Under-21s found in violation of these laws face a $1,000 fine and a one-year license suspension for a first offence. A second offence carries a penalty of 30 days in jail and/or a $2,000 fine, as well as a two-year license suspension. A third or subsequent conviction can result in up to 60 days in jail and/or a $3,000 fine, along with a two-year license suspension.
When it comes to drinking and driving, Idaho has strict laws in place. It is illegal to operate a motor vehicle while under the influence of alcohol, with a blood alcohol content (BAC) limit of 0.08% for adults over the age of 21. For under-21s, the legal limit is significantly lower at 0.02% BAC. This limit also applies to operating a vessel, such as a boat.
The penalties for a first conviction of driving under the influence (DUI) in Idaho include up to six months in jail, a license revocation for three to six months, and a fine of up to $1,000. A second conviction within ten years can result in up to one year in jail, a one-year license suspension, a fine of up to $2,000, and the requirement to install an ignition interlock device (IID).
It is important to note that Idaho's implied consent laws require all drivers lawfully arrested for a DUI to submit to a blood, urine, or breath test. Refusal to submit to a BAC test can result in additional penalties, such as license suspension and enhanced fines.
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Commercial drivers' legal limit
Idaho has strict laws regarding alcohol consumption and driving. Driving under the influence (DUI) of alcohol is a serious crime in the state. Idaho law prohibits anyone from operating or being in actual physical control of a motor vehicle when under the influence of alcohol, drugs, or other intoxicating substances.
For commercial drivers in Idaho, the legal blood alcohol concentration (BAC) limit is 0.04%. This means that anyone driving a commercial vehicle, including school bus drivers, must maintain a BAC of less than 0.04%. If a commercial driver's BAC level is above this threshold, they will face steep penalties, including jail time and license suspension.
Idaho's implied consent law states that by having a driver's license and operating a motor vehicle, you agree to abide by the law and give your consent to chemical testing if a police officer has a reasonable suspicion of impaired driving. Chemical testing may include a breath test, blood test, or urine test, and the results are considered evidence of impairment.
Refusing to submit to a BAC test in Idaho can also result in consequences. While you have the right to refuse, the state may punish those who do so. Declining a BAC chemical test will result in a $250 fine and a one-year driver's license suspension. Additionally, you may still be prosecuted for driving under the influence and face further penalties if convicted.
It is important to note that Idaho laws offer a variety of blood alcohol limits, depending on age and vehicle type. For drivers under 21 years of age, the maximum BAC is 0.02%, and for drivers over 21 operating personal vehicles, the limit is 0.08%. If a driver's BAC exceeds these limits, they will be subject to penalties, including fines, license suspension, and potential jail time.
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Penalties for refusing a sobriety test
In Idaho, it is illegal to drink alcohol while driving or to drive under the influence of alcohol or other drugs, even if the drugs are legal. The legal limit for driving under the influence of alcohol in Idaho is a blood alcohol concentration (BAC) of 0.08%. If you are under 21, you cannot drive with a BAC of 0.02% or higher.
While you do have the right to refuse a field sobriety test in Idaho, there are still legal penalties for doing so. If you refuse to take a test for blood alcohol or drug levels, you may still be prosecuted for driving under the influence. The penalties for refusing a sobriety test in Idaho include:
- A fine of $250
- A one-year suspension of your driver's license for a first refusal and a two-year suspension for a second refusal within ten years
- Mandatory installation of a state-approved ignition interlock system for one year after the end of the suspension period
- Additional consequences for failure to comply with the test, such as an additional $1,000 fine, probation, and attendance at a drug and alcohol awareness program if convicted of a DUI
It is important to note that field sobriety tests are not always reliable, and police officers may try to pressure you into taking one even when you are not legally required to do so. However, refusing a field sobriety test may result in the officer requesting a blood alcohol concentration (BAC) test, such as a breathalyzer test, which carries its own set of penalties for refusal.
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Buying alcohol under 21
In Idaho, it is illegal for anyone under the age of 21 to buy any alcoholic beverages. This means that those under 21 may not attempt to buy alcohol or drink it in a bar, restaurant, or store. It is also illegal for anyone to sell or give alcohol to anyone under 21, or to allow them to buy or consume it in such establishments. The only exception to this rule is that those under 21 may legally drink beer or wine in a private residence, as long as a parent or guardian is present. The residence does not need to be that of the parent or guardian.
The penalties for violating these laws are severe. A first-time offense for possession or consumption of alcohol by a minor is punishable by a fine of $300. A second offense is a misdemeanor punishable by a fine of up to $2,000, up to 30 days in jail, or both. Third and subsequent convictions are punishable by a fine of up to $3,000, up to 60 days in jail, or both. A first misdemeanor conviction also carries a suspension of driving privileges for up to a year, while subsequent misdemeanor convictions can result in a driver's license suspension of up to two years.
In addition to these penalties, using a false ID to purchase alcohol is a crime in Idaho and may lead to driver's license suspension. It is also illegal to make, transfer, lend, or sell a fake ID. Retailers are required to refuse service and contact the police if they suspect a customer is using a false ID.
It is important to note that Idaho has strict laws regarding driving under the influence (DUI) of alcohol. It is illegal to drink alcohol while driving or to drive with a blood alcohol content (BAC) of 0.08% or higher for those over 21, and 0.02% for those under 21. Refusing to take a test for blood alcohol levels can result in a fine of $250 and a one-year suspension of driving privileges. A DUI conviction can lead to additional fines, probation, and the requirement to attend a drug and alcohol awareness program.
While there is no concrete evidence to determine how much alcohol can be consumed to be considered legally drunk, the only surefire way to avoid a DUI arrest is to refrain from drinking and driving altogether. However, it is important to be aware of your legal rights, as false arrests and wrongful accusations can occur.
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Frequently asked questions
The legal limit for alcohol in Idaho for drivers under 21 is 0.02% BAC. If your BAC is 0.02% or more, you could face a fine of up to $1,000 and a one-year license suspension.
The legal limit for alcohol in Idaho for drivers over 21 driving personal vehicles is 0.08% BAC. If your BAC is 0.08% or more, law enforcement can charge you with a DUI.
The legal limit for alcohol in Idaho for commercial drivers is 0.04% BAC.
The penalties for driving under the influence in Idaho include fines, license suspension, jail time, probation, and attendance at a drug and alcohol awareness program. If your BAC is 0.20% or higher, you may face enhanced penalties such as lengthier jail sentences.






















