Illinois legalized recreational marijuana in 2020. As a result, many drivers might think this means they can use marijuana and drive. However, Illinois DUI laws treat marijuana like alcohol. You can still face DUI charges if you drive while high.
How Illinois law treats marijuana impairment
The law separates legal possession from safe driving after marijuana use. Consider these elements:
- Legal limits: Illinois lets adults possess up to 30 grams of marijuana but you cannot drive with more than 5 nanograms of THC in your blood.
- What officers look for: Police watch for red eyes, the smell of marijuana, slow reactions or bad driving as signs you might be high.
- Roadside tests: Officers use the same balance and coordination tests they use for drunk drivers, even though marijuana affects your body differently.
- Special training: Some police officers receive extra training to spot drug impairment beyond basic roadside tests.
Police can charge you with DUI even if your THC level seems low if they believe you were too impaired to drive safely.
Challenges with marijuana DUI cases
These cases present unique complications that differ significantly from traditional alcohol-related DUIs. Keep these points in mind:
- THC stays in your blood for days or weeks after you use marijuana
- No roadside test can measure if you are high right now
- Blood tests might show marijuana you used days ago, not the day you drove
- Balance tests may not prove marijuana impairment accurately
Someone familiar with Illinois DUI law and the science behind THC testing might help you evaluate whether the evidence against you actually proves impairment at the time you drove.
Legal marijuana possession does not give you the right to drive while impaired in Illinois. The gap between when THC remains detectable and when its impairing effects actually wear off creates complex legal questions in many marijuana DUI cases.