Questions
Can Cops Tell If You Drive High in Maryland?
Yes, cops in Maryland can tell if you drive high using trained Drug Recognition Experts, field sobriety tests, and blood tests that measure THC. Even without a precise legal limit, observed impairment and officer testimony can lead to a DUI charge.
How Do Police Detect Cannabis-Impaired Driving?
Maryland law enforcement uses a combination of observations, standardized tests, and forensic analysis to determine if you're driving under the influence of cannabis. Here's the typical process:
- Observed driving behavior — Officers first need a reason to stop your vehicle. Erratic driving like weaving, braking without cause, or driving too slowly can prompt a traffic stop.
- Field Sobriety Test (FST) — If the officer suspects impairment, they may ask you to perform standardized field sobriety tests, such as the walk-and-turn or one-leg stand. These tests assess balance, coordination, and divided attention, which cannabis can affect.
- Drug Recognition Expert (DRE) evaluation — Maryland State Police and many local departments have officers trained as DREs. These experts conduct a 12-step evaluation, including checking pupil size, eye movement, and vital signs, to identify drug impairment.
- Chemical testing — If impairment is suspected, the officer may request a blood test. In Maryland, you can be charged with DUI if you refuse a chemical test, which can lead to license suspension.
While there is no legal per se THC limit in Maryland, a blood test showing THC can support the officer's observations. The combination of driving behavior, FST performance, and DRE findings often forms the basis of a cannabis DUI charge.
What Signs of Impairment Do Officers Look For?
Officers are trained to spot physical and behavioral cues that suggest cannabis use. Here are common signs they watch for:
- Red or bloodshot eyes — Cannabis can cause blood vessels in the eyes to expand, making them appear red.
- Slow reaction time — Delayed responses to questions or commands can indicate impairment.
- Slurred speech — Cannabis may affect motor control, leading to slurred or slowed speech.
- Odor of marijuana — The distinct smell of cannabis in the car can give officers probable cause for a search.
- Poor coordination — Difficulty with fine motor skills, like fumbling for a license, may be noticed.
- Inconsistent answers — Confusion about time or place, or difficulty following instructions, can raise suspicion.
These signs alone may not prove impairment, but they can justify further testing and a DUI investigation.
Can a Blood Test Prove Impairment?
A blood test can detect THC and its metabolites, but proving impairment is more complex. Here's what you need to know:
| Factor | What It Means | Why It Matters |
|---|---|---|
| THC presence | Blood test shows active THC | Indicates recent use, but not necessarily impairment |
| THC metabolites | Byproducts of THC breakdown | Can remain for days or weeks, not proof of impairment |
| No legal limit | Maryland has no per se THC limit | Prosecutors must rely on observed impairment |
| Officer testimony | DRE and FST results | Often the strongest evidence in cannabis DUIs |
| Individual tolerance | Regular users may function differently | Blood levels don't always correlate with impairment |
In practice, a blood test showing THC, combined with officer observations, can lead to a DUI conviction. But a positive test alone is rarely enough.
What Should You Do If Pulled Over?
If you're stopped and suspected of driving high, how you handle the interaction matters. Here are practical steps:
- Pull over safely — Find a well-lit area and turn off your engine. Stay in your vehicle unless instructed otherwise.
- Be polite and cooperative — Keep your hands visible, provide your license and registration, and answer basic questions.
- Know your rights — You have the right to remain silent. You don't have to admit to using cannabis or answer questions about where you've been.
- Decline field sobriety tests — You can politely refuse FSTs, as they are voluntary in Maryland. Refusing may lead to arrest, but it also limits evidence against you.
- Consider a lawyer — If you're arrested, ask for an attorney immediately. A lawyer can help navigate the legal process and challenge evidence.
- Contact us for guidance — While we can't provide legal advice, our team at Remedy Baltimore can help you understand responsible cannabis use. If you have questions about products or consumption, call (443)-348-3297.
Remember, the best way to avoid a DUI is to never drive after using cannabis. Plan ahead with a designated driver or ride-share.
Directions to our dispensary in Baltimore from Lorraine Park Cemetery
Start at Lorraine Park Cemetery and head to Remedy (Baltimore) at 7165-C Security Blvd, Windsor Mill, MD 21244.
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Frequently asked questions
Can you get a DUI for cannabis in Maryland?
Yes, Maryland law prohibits driving under the influence of any drug, including cannabis. Even if you have a medical marijuana card, you can be charged with a DUI if you're impaired while driving.
What is the legal THC limit for driving in Maryland?
Maryland does not have a specific legal THC limit for drivers. Instead, officers rely on observed impairment and chemical tests to build a case.
Do I have to take a blood test if pulled over?
Under Maryland's implied consent law, you must submit to a chemical test if an officer has reasonable grounds to suspect impairment. Refusing can result in license suspension and other penalties.
Can a medical marijuana patient drive in Maryland?
Medical marijuana patients are not exempt from DUI laws. If you're impaired, you can be charged, regardless of your patient status.
Also asked as
- How do police detect marijuana DUI in Maryland?
- What happens if you drive high in Maryland?
- Can a blood test show cannabis impairment?