{"id":286737,"date":"2025-11-21T10:12:25","date_gmt":"2025-11-21T15:12:25","guid":{"rendered":"https:\/\/content.findlaw-admin.com\/ability-law\/dui\/laws-resources\/per-se-dui-laws.html"},"modified":"2026-03-25T09:56:09","modified_gmt":"2026-03-25T14:56:09","slug":"per-se-dui-laws","status":"publish","type":"page","link":"https:\/\/www.findlaw.com\/dui\/laws-resources\/per-se-dui-laws.html","title":{"rendered":"What Does ‘Intoxicated Per Se’ in DUI Law Mean?"},"content":{"rendered":"\n
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What Does 'Intoxicated Per Se' in DUI Law Mean?<\/h1>\n\n
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\n By Amy Vandervort-Clark, J.D.<\/a> | Legally reviewed by Melissa Bender, Esq.<\/a>\n | Last reviewed\n
\n \n <\/i>\n Legally Reviewed\n <\/summary>\n\n
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This article has been written and reviewed for legal accuracy, clarity, and style by FindLaw\u2019s team of legal writers and attorneys<\/a> and in accordance with our editorial standards<\/a>.<\/em><\/p>\n\n <\/div>\n <\/details>\n\n

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The last updated date refers to the last time this article was reviewed by FindLaw or one of our contributing authors<\/a>. We make every effort to keep our articles updated. For information regarding a specific legal issue affecting you, please contact an attorney in your area<\/a>.<\/em><\/p>\n\n <\/div>\n <\/details>\n<\/section>\n\n\n

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A per se drunk driving offense happens when law enforcement finds that your blood alcohol content (BAC) is higher than the legal limit. “Per se” means that the police don’t need more evidence to charge you with a DUI.<\/p>\n\n <\/div>\n\n\n\n

After a few drinks, you’d realize you aren’t completely sober. You may feel safe enough to drive, so you’re tempted to risk the trip. But if a police officer pulls you over, it will be easy for them to measure your level of inebriation.<\/p>\n

Whether you’re under the influence of alcohol or drugs, getting behind the wheel of a vehicle can cost you more than money and a night in jail. Impaired or drunk driving accidents are often deadly. In response, states have been enacting stricter laws to discourage drunk driving.<\/p>\n

One of the more popular types of state laws is the \u201cper se” intoxication law. This article explains how states set firm limits for drunk driving offenses. You can also find out how to fight a per se charge by speaking with a local DUI defense lawyer<\/a>.<\/p>\n

What are Per Se Intoxication Laws?<\/h2>\n

Per se laws in\u00a0DUI or DWI cases<\/a>\u00a0generally mean that if you have a blood alcohol concentration (BAC) at or above the state’s legal limit, the law considers you intoxicated. Law enforcement needs no further evidence of intoxication or impairment for a DUI case, as “per se” means \u201cby itself” or \u201con its own.”<\/p>\n

These laws make it easier for prosecutors to establish your impairment. All states, except for Utah, have per se DUI laws that find any driver intoxicated with a BAC at or above 0.08%. The legal limit is lower if you operate a\u00a0commercial vehicle<\/a>, usually around 0.04%. In most instances, commercial drivers will also lose their commercial driver’s license (CDL) for at least one year.<\/p>\n

Utah recently changed its legal limit to 0.05% with great success. The\u00a0National Transportation Safety Board (NTSB<\/a>) has advocated since 2013 for states to reduce the per se intoxication limit to 0.05%.<\/p>\n

These laws show the importance for people who drink to realize that, regardless of how sober you feel and behave, your BAC matters once you get behind the wheel.<\/p>\n

Chemical Tests and Implied Consent Laws<\/h2>\n

Having a driver’s license is a privilege. You’re expected to follow the law and drive with care. If law enforcement reasonably suspects you are operating a motor vehicle while under the influence, they can ask you to submit to\u00a0chemical tests<\/a>\u00a0and field sobriety tests.\u00a0Implied consent laws<\/a>\u00a0mean you imply your consent to these tests when given your driver’s license. While you have the right to refuse these tests, there are immediate consequences for not complying with them.<\/p>\n

These tests may include a Breathalyzer to measure the level of alcohol in your system. You may also need a blood test, saliva test, or urine test to verify your BAC. If your BAC is at or above your state’s legal limit, you face a per se charge of driving under the influence.<\/p>\n

Per Se Limits for Underage Drivers<\/h2>\n

Underage drivers may face more strict measures than standard per se BAC levels. Motorists under the legal drinking age often have “zero tolerance<\/a>” rules that make it illegal to have any amount of alcohol in their blood. The official limit may range from zero to 0.02%, depending on your state. This makes sense, as it’s prohibited for those under the age of 21 to consume alcohol. A DUI conviction can result in losing driving privileges, orders to install an ignition interlock device, or even jail if your BAC exceeds the adult legal limit.<\/p>\n

Do Per Se Laws Apply to Drugged Driving?<\/h2>\n

The BAC limits established by per se DUI laws do not address\u00a0driving under the influence of drugs<\/a>. However, most states have enacted per se laws about drugged driving in recent years.<\/p>\n

Most states have a zero tolerance rule for intoxicating drugs in a person’s system. These laws reference the intoxicating substance or its metabolite in your system.<\/p>\n

Currently, Illinois, Montana, Ohio, and Washington<\/a> have established specific limits for the presence of marijuana. These range from 2 to 5 nanograms per milliliter of tetrahydrocannabinol (THC) in a driver’s blood. Colorado recognizes a \u201cpermissible inference” of intoxication if you have 5 nanograms per milliliter of THC in your blood. It does not matter if you use cannabis for a medical condition.<\/p>\n

Nevada used to have a per se limit of 2 nanograms THC in blood and 5 nanograms for its metabolite but dropped its strict per se limit for most DUI prosecutions in 2021. Currently, for first and second DUI offenses, a driver must be shown to be impaired regardless of THC level. The limits apply only to a third or subsequent DUI offense or if there’s a crash that results in death or substantial bodily harm.<\/p>\n

Prosecutions under per se laws in drug cases face the added challenge of establishing the presence of a type of prohibited substance in your system. Unlike alcohol, which comes in one form, drug testing and analysis can be more complicated. The fact that certain drugs remain in your system for days or even weeks after their intoxicating effects have worn off complicates matters. This is why the laws usually include the substance and what gets left over once your body metabolizes them.<\/p>\n

Per Se DUI Convictions and Penalties<\/h2>\n

Most first-time DUI charges are misdemeanors but do carry heavy penalties. Some states prohibit\u00a0plea bargains<\/a>\u00a0or a reduction in a DUI charge.<\/p>\n

If found guilty of DUI, you will lose your driver’s license for a while. You may apply for a special, limited license that will enable you to drive to work or to perform minor essential tasks. Still, these often require an\u00a0ignition interlock device (IID)<\/a>\u00a0installed in your car. An IID is a Breathalyzer device that requires you to submit a breath sample. If it detects alcohol in your system, you cannot start the vehicle. A notification goes to an authority monitoring your case, and you face additional penalties.<\/p>\n

Drunk driving charges will result in your arrest. If convicted, you will face heavy fines and license revocation at a minimum. You may have your vehicle impounded. Several states, such as\u00a0Arizona<\/a>, have mandatory jail time. Many states are moving toward compulsory IID installation, even for a first offense.<\/p>\n

A DUI arrest and conviction on your record can make finding a job, going to college, or finding housing difficult.<\/p>\n

Challenging the Results of Chemical Tests<\/h2>\n

These laws do not mean that all defendants who register a 0.08% BAC or higher face an automatic conviction in their DUI case. For example, defendants may challenge the\u00a0validity of BAC test results<\/a>, the machines that collect these results, and the procedures used. Various other defenses in\u00a0criminal DUI cases<\/a>\u00a0also exist. It would be best to speak to a\u00a0criminal defense attorney<\/a>\u00a0to explore what defenses might work for your case.<\/p>\n

Have Questions About Per Se DUI Laws? Ask an Attorney<\/h2>\n

If arrested for a per se DUI offense, you may need legal representation, especially if you want to contest the blood or breath test results. Contact a local\u00a0DUI defense attorney<\/a>\u00a0today to get legal advice. A DUI criminal defense attorney can evaluate your case and fight for the best resolution.<\/p>\n\n\n

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