Can You Drive After Taking CBD? Unpacking the Laws and Risks of a DUI (2025)
Cannabidiol, more commonly known as CBD, has surged in popularity as a wellness product, sought after for its potential to help manage a variety of ailments, from anxiety and migraines to chronic pain and epilepsy. Thanks to the federal 2018 Farm Bill, which legalized hemp and its derivatives, CBD products are now widely available in grocery stores, pharmacies, and online. However, as a compound derived from the cannabis plant, CBD’s relationship with driving laws can be confusing. Can you get a DUI for driving after taking CBD? Is it safe? This guide delves into the legality of CBD, how state DUI laws can apply, and what you need to know to use CBD responsibly without risking your safety or your driver’s license.
The Legal Foundation: Understanding CBD and the 2018 Farm Bill
The legality of CBD in the United States hinges on the Agriculture Improvement Act of 2018, or the 2018 Farm Bill. This landmark legislation federally legalized the cultivation and sale of hemp by removing it from the list of illegal controlled substances. For a cannabis plant or a product derived from it to be legally classified as “hemp,” it must contain no more than 0.3% delta-9-tetrahydrocannabinol (THC) by dry weight. THC is the primary psychoactive compound in marijuana that produces the intoxicating “high.”
This legal distinction is crucial. Because federally legal CBD products are derived from hemp and contain only trace amounts of THC (or are THC-free), they are not intended to cause impairment. This is the fundamental reason why using compliant CBD products is generally unlikely to lead to a DUI.
However, it’s important to note that state laws can vary. While most states align with the federal definition, some have stricter regulations. For example, a state like Idaho has historically had very restrictive laws, where any material derived from cannabis buds or containing any amount of THC could be considered illegal. Therefore, it’s always wise to be aware of your specific state’s laws regarding CBD and THC content.
DUI Laws and CBD Use: Where Things Get Complicated
Every state in the U.S. has laws that prohibit driving under the influence (DUI) of drugs or other controlled substances. A drug-related DUI can typically be proven in one of two ways: by demonstrating actual impairment or by showing the driver had a prohibited amount of a substance in their system (a “per se” violation). Because federally legal CBD is no longer classified as an illegal controlled substance and is non-intoxicating, the risk of getting a DUI solely for CBD use is very low. However, there are several important nuances and potential pitfalls to consider.
The “Per Se” DUI Risk: The Problem of Trace THC
A “per se” DUI law makes it automatically illegal to drive with a certain concentration of a substance in your system, regardless of whether you can be proven to be impaired. The most common example is the .08% blood alcohol concentration (BAC) limit for alcohol.
A handful of states have extended this concept to drugged driving by establishing “per se” limits for THC. For instance, Washington prohibits operating a vehicle with five nanograms or more of THC per milliliter of blood. Other states with specific THC per se limits include Illinois (5 ng/ml of blood or 10 ng/ml of other bodily substance), Montana (5 ng/ml), Nevada (2 ng/ml), and Colorado (a “permissible inference” of impairment at 5 ng/ml).
This is where the risk for CBD users comes in. Full-spectrum CBD products, by legal definition, can contain up to 0.3% THC. While this is a very small amount, it is not zero. Regular or high-dose use of full-spectrum CBD products could potentially lead to a THC concentration in the blood that exceeds a state’s per se limit, even if the user feels no impairment whatsoever. This risk is compounded by two major issues:
- Inaccurate Product Labeling: The CBD market is not always well-regulated. Recent studies have found that a significant percentage of commercially available CBD products are inaccurately labeled. One study found that approximately 20% of tested CBD products had higher THC concentrations than what was stated on the label. If a CBD product contains more THC than it’s supposed to, the amount that ends up in a driver’s system could be unexpectedly high.
- THC Accumulation: THC is fat-soluble and can accumulate in the body over time. A person who regularly uses a compliant full-spectrum CBD product might have a persistent low level of THC in their system, which could be detected in a blood or urine test during a DUI investigation.
Critics of THC per se laws argue that, unlike alcohol, the concentration of THC in the blood has little to no direct correlation with the level of impairment. Studies have shown that THC can be detected in a chemical test days or even weeks after a person last used marijuana, long after any impairing effects have worn off.
The “Impairment” DUI Risk: Is CBD Truly Non-Impairing?
The other type of DUI is based on proving that a substance, legal or not, has impaired a driver’s ability to operate a vehicle safely. Pure CBD is widely considered non-intoxicating and non-impairing. However, some individuals report side effects from CBD, such as fatigue, drowsiness, or a drop in blood pressure. If a driver were to experience significant drowsiness after taking a large dose of CBD and this led to an accident or erratic driving, it’s conceivable that a prosecutor could argue they were impaired, even without the presence of THC.
This is similar to how a person can get a DUI for driving after taking a legal, over-the-counter medication like Benadryl if it causes drowsiness that impairs their driving. The legality of the substance is not a defense against an impairment-based DUI charge.
Marijuana DUIs: A Separate and Serious Issue
It is crucial to distinguish between federally legal hemp-derived CBD and marijuana. While many states have legalized or decriminalized marijuana for recreational or medical use, driving under the influence of marijuana is illegal in every single state. The legalization of marijuana for personal use has no effect on DUI laws, just as the legality of alcohol does not permit drunk driving.
An impairment DUI for marijuana is proven through evidence of how the drug affected the driver. This can include officer observations of driving behavior, physical signs of impairment (e.g., red eyes, slow reaction time), performance on field sobriety tests, and statements made by the driver. The degree of impairment required for a conviction varies by state. For example, in Nevada, prosecutors must prove the driver was “incapable of safely driving,” while under Massachusetts law, they must show the substance “diminished the [person’s] ability to operate a motor vehicle safely.”
Best Practices for CBD Users to Avoid a DUI
Given the legal nuances and potential risks, CBD users can take several precautions to ensure their use remains legal and safe, especially when it comes to driving:
- Choose THC-Free Products: The most effective way to eliminate the risk of a THC-related per se DUI is to use CBD products that are certified to contain zero THC. These are typically labeled as “Broad-Spectrum CBD” (which contains other cannabinoids but no THC) or “CBD Isolate” (which is pure CBD). This removes the variable of inaccurate labeling or THC accumulation.
- Verify with Third-Party Lab Reports: Reputable CBD companies provide third-party lab reports (Certificates of Analysis, or CoAs) for their products. Always check the CoA for the product you are purchasing to verify its cannabinoid content, particularly the level of delta-9 THC. Ensure it is below the 0.3% legal limit, or preferably, non-detectable (“ND”).
- Understand Your Body’s Reaction: When first using a new CBD product or a higher dose, pay attention to how it affects you. If you experience any drowsiness or fatigue, do not drive. It’s best to first try new products at home in a safe environment.
- Consider a Prescription (If Applicable): Some states provide a defense or exception to certain DUI charges for drivers who hold a valid prescription for a substance. While this is more common for medical marijuana, obtaining a physician-prescribed CBD product (like Epidiolex for epilepsy) that is tested and FDA-approved provides the highest level of legal and safety assurance.
- Do Not Mix with Other Substances: Avoid consuming CBD with alcohol or other substances that can cause impairment, as their combined effects can be unpredictable and increase your risk of being impaired.
Conclusion: Drive Responsibly, Choose Wisely
In conclusion, while using federally compliant, hemp-derived CBD is generally unlikely to result in a DUI, the risk is not zero. The primary legal danger comes from the trace amounts of THC present in many full-spectrum CBD products, which could potentially lead to a “per se” THC DUI in states with specific nanogram limits, especially if the product is inaccurately labeled. Additionally, the potential for CBD to cause drowsiness in some individuals could, in rare cases, lead to an impairment-based DUI charge.
The most prudent choice for any driver who uses CBD is to prioritize safety and eliminate risk. This means opting for high-quality, third-party tested, THC-free (broad-spectrum or isolate) CBD products and never driving if you feel anything other than completely alert and unimpaired. As with any substance, legal or not, your ability to safely operate a vehicle must always be your top priority. If you’ve been arrested for or charged with driving under the influence, it is essential to contact an experienced DUI lawyer who can explain how the law applies to the specific facts of your case.
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