Cannabis DUI Laws by State

Cannabis DUI laws vary dramatically across the United States. Some states set specific THC blood concentration limits (per se), others enforce zero-tolerance policies where any detectable THC triggers a DUI charge, and many require prosecutors to prove actual impairment (effect-based). Explore each state's DUI laws, THC limits, testing methods, and penalties below.

7
Per Se THC Limit
11
Zero Tolerance
33
Effect-Based
Per Se Limit — specific THC ng/mL threshold
Zero Tolerance — any detectable THC
Effect-Based — impairment must be proven

Alabama

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Alaska

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Arizona

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

Arkansas

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

California

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Colorado

Per Se Limit
THC Limit5 ng/mL blood
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Connecticut

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, oral fluid, field sobriety
Implied ConsentYes

Delaware

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

District of Columbia

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety, DRE evaluation
Implied ConsentYes

Florida

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Georgia

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

Hawaii

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Idaho

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Illinois

Per Se Limit
THC Limit5 ng/mL blood
TestingBlood, saliva, field sobriety
Implied ConsentYes

Indiana

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

Iowa

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

Kansas

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Kentucky

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Louisiana

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Maine

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Maryland

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Massachusetts

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Michigan

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

Minnesota

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Mississippi

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Missouri

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Montana

Per Se Limit
THC Limit5 ng/mL blood
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Nebraska

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Nevada

Per Se Limit
THC Limit2 ng/mL blood, 10 ng/mL urine
TestingBlood, urine, field sobriety
Implied ConsentYes

New Hampshire

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

New Jersey

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation, oral fluid
Implied ConsentYes

New Mexico

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

New York

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

North Carolina

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

North Dakota

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Ohio

Per Se Limit
THC Limit2 ng/mL blood
TestingBlood, urine, field sobriety
Implied ConsentYes

Oklahoma

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, saliva, field sobriety
Implied ConsentYes

Oregon

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Pennsylvania

Per Se Limit
THC Limit1 ng/mL blood
TestingBlood, field sobriety
Implied ConsentYes

Rhode Island

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

South Carolina

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

South Dakota

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

Tennessee

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Texas

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Utah

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, oral fluid, field sobriety
Implied ConsentYes

Vermont

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Virginia

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

Washington

Per Se Limit
THC Limit5 ng/mL blood
TestingBlood, field sobriety, DRE evaluation
Implied ConsentYes

West Virginia

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Wisconsin

Zero Tolerance
THC LimitZero tolerance (any detectable amount)
TestingBlood, urine, field sobriety
Implied ConsentYes

Wyoming

Effect-Based
THC LimitNo limit (effect-based)
TestingBlood, urine, field sobriety
Implied ConsentYes

Disclaimer: The information on this page is provided for educational and informational purposes only and does not constitute legal advice. Cannabis remains illegal under US federal law. State DUI laws, THC limits, and regulations are subject to change and may vary by local jurisdiction. Always verify current laws with official state resources and consult with a qualified attorney for legal guidance. Cannabismarketcap does not guarantee the accuracy or completeness of any information presented.