Releaf Blog

Decoding Cannabis: Over the limit, but not impaired? What the science shows

The UK (and many other countries) sets its drug-driving THC limit at 2 µg/L of blood, but is that a measure of impairment, or just detection? A 2026 simulator study found frequent cannabis users were no more impaired than non-users 12 to 15 hours after smoking, despite still exceeding that threshold. We decode what the research really shows, and why it is relevant for medical cannabis patients who are worried about getting behind the wheel.