Florida Marijuana DUI Rules — §316.193 in Miami

Legal Disclaimer: This information reflects Miami-Dade cannabis law as of July 2026 and is for educational purposes only. It is not legal advice. Laws and regulations change — always verify current rules with the Florida Office of Medical Marijuana Use or a qualified attorney. Cannabis remains illegal under federal law.

Last verified: May 2026

The Statute

Florida driving-under-the-influence law lives in §316.193. Subsection (1)(a) criminalizes driving when the person is “under the influence of alcoholic beverages, any chemical substance set forth in section 877.111, or any substance controlled under chapter 893, when affected to the extent that the person’s normal faculties are impaired.” Cannabis — including state-legal medical cannabis — is a Schedule I substance under Chapter 893; the §316.193 prohibition applies regardless of OMMU patient status.

Not a Per-Se THC State

Unlike Colorado (5 ng/mL active THC blood threshold), Washington (5 ng/mL), Nevada (2 ng/mL), Ohio (2 ng/mL), or Pennsylvania (1 ng/mL), Florida has no per-se THC limit. The state must affirmatively prove impairment of normal faculties, not just THC presence. This is both a defense advantage and a prosecution flexibility:

Defense advantage: THC metabolites (carboxy-THC, hydroxy-THC) can persist in blood for days or weeks after impairment ends, particularly in heavy users. A blood test showing “THC present” is not, by itself, proof of intoxication.
Prosecution flexibility: The state doesn’t need a blood-level number. Officer observation, field sobriety performance, dash cam, body cam, witness statements, driving pattern, and the totality of circumstances all carry weight.

What a Miami-Dade Marijuana DUI Case Looks Like

A typical case begins with a traffic stop — lane drift, speeding, expired tag, equipment violation. The officer detects cannabis odor or observes physical indicators (red eyes, dry mouth, delayed responses, droopy eyelids), conducts a roadside inquiry, and may request:

Standardized Field Sobriety Tests (SFSTs) — horizontal gaze nystagmus (HGN), walk-and-turn, one-leg stand. HGN is generally considered alcohol-specific and not reliable for cannabis impairment.
Drug Recognition Expert (DRE) evaluation — specially-trained officers conduct a 12-step protocol. Miami-Dade Police Department, MDSO, FHP, and the City of Miami all field DREs. The DRE’s opinion testimony is admissible in Florida and frequently the centerpiece of marijuana-DUI cases.
Implied-consent blood or urine test — Florida’s implied-consent statute (§316.1932) allows the state to demand a blood sample after a felony-DUI arrest or in DUI investigations. Refusal carries an automatic 1-year license suspension on first refusal, 18-month for subsequent.

Penalties

First conviction: Up to 6 months jail (9 if BAL/THC level enhancement applies; cannabis cases without per-se limit don’t typically get this enhancement), $500–$1,000 fine, 50 hours community service, 6–12 month license revocation, vehicle impound 10 days, mandatory DUI school + substance-abuse evaluation.
Second conviction within 5 years: Mandatory minimum 10 days jail, $1,000–$2,000 fine, 5-year license revocation, ignition interlock for 1 year.
Third conviction within 10 years: Felony, mandatory minimum 30 days jail, 10-year license revocation, 2-year ignition interlock.
DUI causing serious bodily injury: 3rd-degree felony.
DUI manslaughter: 2nd-degree felony, mandatory 4-year minimum.

Medical Cannabis Patient Status Is Not a Defense

The Florida medical cannabis statute — §381.986 — is explicit that nothing in the medical program affects DUI law. A patient with a fully-compliant MMUR card who consumes MMTC-purchased flower according to the 70-day supply rule is just as subject to §316.193 as a non-patient who buys on the street. The card protects the possession, not the driving impairment.

Practical Defense Strategies in Miami-Dade

Miami-Dade DUI defense counsel routinely challenges marijuana-DUI cases on:

Metabolite persistence: Carboxy-THC has a half-life of days; presence does not equal current impairment.
HGN unreliability for cannabis: The HGN test is alcohol-validated, not cannabis-validated.
DRE protocol challenges: The 12-step DRE protocol has been challenged extensively in Florida appellate courts.
Officer-observation infirmities: Red eyes, dry mouth, etc. are non-specific and have many causes.
Initial-stop validity: Pretextual stops, equipment-violation stops without articulable suspicion of impaired driving, and racially-disparate stop patterns are all defensive lines.

The Cannabis-Plus-Alcohol Stack

The most aggressively-prosecuted Miami-Dade marijuana-DUI cases combine cannabis use with alcohol. Combined-substance impairment lowers the BAL threshold for prosecution and generally results in stronger officer-observation evidence (alcohol intoxication is more visibly obvious than cannabis intoxication alone). Patients who consume cannabis socially in Miami should pair that with strict zero-alcohol if driving.

Implied Consent and Refusal Strategy

Florida’s implied-consent law applies to blood and urine, not just breath. Refusing a blood draw after a felony-DUI arrest or in any DUI investigation triggers:

1-year license suspension on first refusal
18-month suspension on second or subsequent refusal
Refusal itself is admissible as consciousness-of-guilt evidence

Despite this, defense counsel often advises against blood draws in marijuana cases on the grounds that THC metabolite findings can substitute prosecution’s difficult impairment burden with a much-easier presence-based circumstantial inference. Patients facing this decision should consult counsel before the draw if at all possible.

Companion Site — Statewide Florida DUI Context

For statewide Florida DUI patterns, FHP arrest data, and the politics of repeated failed attempts to introduce a per-se THC threshold in the Florida Legislature, see CannabisFL.org.