Can I Get a DUI While Driving High on Medical Marijuana?

Many people assume that because medical marijuana is legal in Florida, they cannot be charged with a DUI while driving after using it. However, Florida Statute, 316.193 makes it illegal to operate a vehicle while impaired by alcohol, a controlled substance, or a chemical substance that affects normal faculties.

Medical Marijuana and DUI in Florida

Although medical marijuana is lawful for qualified patients, Florida law still classifies it as a controlled substance. If a driver’s normal faculties are impaired due to marijuana use, they can face DUI charges. The same applies to Delta-8 THC, a hemp-derived compound that can cause impairment.

Just as it is legal for an adult over 21 to consume alcohol, and just as it is legal for a medical marijuana cardholder to ingest cannabis, it is still illegal to drive while impaired by these substances. If alcohol, marijuana, or another drug affects a driver’s ability to safely operate a vehicle, a DUI charge may follow.

Defenses to a Marijuana DUI Charge

Although prosecutors may attempt to prove impairment, several legal defenses exist for marijuana-related DUI charges:

• Not Impaired at the Time of Driving: Marijuana can remain in the body for up to 30 days, so a positive test does not necessarily mean the driver was impaired when operating the vehicle.
• Challenging Blood or Urine Test Results: Test results can be unreliable due to improper calibration, contamination, or chain-of-custody errors.
• Challenging Field Sobriety Tests: Many individuals have medical conditions that impact their performance, or officers may conduct tests in poor environmental conditions.
• Suppressing Evidence After an Unlawful Stop: If law enforcement lacks reasonable suspicion for a traffic stop, evidence collected may be inadmissible in court.
• Expert Witness Testimony: Toxicologists and pharmacologists can testify about the limitations of marijuana testing and whether impairment was actually present.

Why Proving Marijuana DUI Is More Difficult

Unlike alcohol, where a 0.08% BAC is a clear impairment threshold, proving marijuana impairment is more complex. Marijuana stays in the system for up to 30 days, meaning a positive test does not necessarily indicate impairment at the time of driving. Prosecutors must show that the driver was actively impaired while operating the vehicle, not just that marijuana was present in their system.

Common Evidence in Marijuana DUI Cases

• Odor of Burnt Marijuana: The smell of marijuana can indicate recent use and may be used as evidence by officers.
• Erratic Driving Patterns: Weaving, slow reactions, or other unusual driving behaviors can suggest impairment.
• Field Sobriety Tests: Officers assess balance, coordination, and cognitive ability to determine impairment.
• Blood or Urine Tests: Although a positive test alone does not prove impairment, it can support a DUI case when combined with other evidence.

DUI Testing and Refusal Penalties

Florida Statute, 316.1932  allows police officers to request chemical tests to determine impairment:

Penalties for a DUI Conviction

DUI penalties apply regardless of whether the impairment comes from alcohol, marijuana, or another drug.

First DUI Conviction (Fla. Stat. § 316.193(2)(a)1.)

• Fine: $500 – $1,000
• Jail Time: Up to 6 months
• License Suspension: Minimum 180 days
• Probation: Up to 1 year
• Community Service: Minimum 50 hours
• Vehicle Impoundment: 10 days
• DUI Education Program: Mandatory

Second DUI Conviction (Fla. Stat. § 316.193(2)(a)2.)

• Fine: $1,000 – $2,000
• Jail Time: Up to 9 months
• License Suspension: Minimum 5 years (if within 5 years of the first conviction)
• Ignition Interlock Device: Required for at least 1 year
• Vehicle Impoundment: 30 days

Third DUI Conviction (Within 10 Years) (Fla. Stat. § 316.193(2)(b)1.)

• Felony charge (third-degree felony)
• Fine: $2,000 – $5,000
• Jail Time: Up to 5 years
• License Revocation: Minimum 10 years
• Ignition Interlock Device: Required for at least 2 years
• Vehicle Impoundment: 90 days

Fourth or Subsequent DUI Convictions (Fla. Stat. § 316.193(2)(b)3.)

• Felony charge (third-degree felony)
• Fine: Minimum $2,000
• Jail Time: Up to 5 years
• Permanent License Revocation
• Ignition Interlock Device: Required for at least 2 years

Common Misconceptions About Marijuana DUI

By 2025, the scent of marijuana and hemp smoke is common on Florida roads. Many drivers mistakenly believe that because medical marijuana is legal, they cannot face DUI charges. However, Florida law prohibits driving under the influence of any substance that impairs normal faculties—including legally obtained medical marijuana.

What to Do If You Face DUI Charges in Tampa Bay

If police arrest you for a DUI in Tampa Bay, your actions after the arrest can significantly impact your case. Follow these steps:

• Remain Calm: Do not resist arrest or argue with officers.
• Invoke Your Right to Remain Silent: Anything you say can be used against you.
• Request a Lawyer Immediately: Insist on speaking with an attorney before answering questions.

Contact an Experienced Tampa DUI/Medical Marijuana Lawyer Today

If you are facing DUI charges in Tampa, Hillsborough County, or the Tampa Bay area, securing experienced legal representation is critical. Brancato Law Firm, P.A. has extensive experience handling DUI cases and is familiar with local judges, prosecutors, and courts—giving our clients a strategic advantage.

Contact Brancato Law Firm, P.A. today to discuss your case and build a strong defense.

Call 813-592-8981 to schedule your consultation and protect your future.