What Florida Law Says
Florida Statute 316.193 prohibits driving under the influence of any controlled substance — including marijuana — to the extent that a person's normal faculties are impaired. This applies to medical marijuana patients identically to any other Florida driver. The MMJ card confirms legal authorization to use marijuana; it does not authorize driving while impaired by it.
Florida does not have a per se THC blood concentration threshold for marijuana DUI. Unlike the 0.08% BAC legal presumption for alcohol, marijuana DUI is assessed based on observed impairment — driving behavior, field sobriety tests, Drug Recognition Expert evaluation, and blood or urine testing for THC.
What Counts as Impairment
Florida law defines impairment as affecting normal faculties — the ability to see, hear, walk, talk, judge distances, drive, and perform the physical and mental acts of daily life. In a driving context this includes slowed reaction time, impaired coordination, altered perception of speed and distance, difficulty maintaining lane position, and impaired attention. THC affects these faculties in a dose-dependent and individually variable manner.
Timing and Delivery Method
The safest approach: understand the active effects window of your delivery method and do not drive during that window.
- Inhaled: Peak effects typically within 30 minutes — duration 2–3 hours
- Sublingual tincture: Onset 15–45 minutes — duration 3–5 hours
- Oral capsules / edibles: Onset 1–3 hours — duration 4–8+ hours — the longest active window
Patients using oral products for nighttime symptom management should be aware that residual effects may extend into morning driving hours at higher doses.
Frequently Asked Questions
No — not if you are impaired. Florida Statute 316.193 prohibits driving under the influence of any controlled substance to the extent that normal faculties are impaired. Your MMJ card does not create an exception to this law.
Impairment means a condition affecting normal faculties — reaction time, coordination, perception, judgment. Florida has no per se THC blood level for marijuana DUI. Impairment is assessed through observed behavior, field sobriety tests, and chemical testing.
No. Your card confirms legal authorization to use marijuana — not to drive while impaired by it. A patient who drives impaired by THC faces the same DUI charges as any other driver. Consult a qualified Florida attorney if you have specific legal questions.
Minimum guidelines by delivery method: 3 hours after inhaled use, 5 hours after sublingual, 8+ hours after oral edibles or capsules. These are minimums — individual metabolism and tolerance affect actual impairment duration. When in doubt, do not drive.
Yes. Law enforcement can request blood or urine samples with reasonable suspicion of impairment. THC metabolites may remain detectable for days to weeks. A positive test does not automatically establish DUI but can be used as evidence. Consult a Florida DUI attorney if you are facing related charges.
Questions about your MMJ certification?
Book an in-person evaluation or follow-up with Dr. Sadow at Miracle Leaf West Palm Beach.
