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Cannabis DUI / per se THC laws by state

People search “Cannabis DUI / per se THC by state”, “Cannabis DUI / per se THC laws by state”, and “Cannabis DUI map” when a road trip, boat, bike, or load is about to cross a line. This page is the 50-state index for cannabis dui / per se thc. Colors and quotes are written for someone in that state today, not for what that state demands of its own registered vehicles.

Open the Cannabis DUI difference map

How states differ

Driving after cannabis — impairment vs a numeric THC limit.

  • Per se / numeric THC (or metabolite) limit
  • Zero-tolerance flavor for THC while driving
  • Impairment standard — no simple numeric THC cutoff

Searches this page is meant to answer

If you typed any of these — or a close variant with a state name — this is the Crosstatelaws topic that should show up:

  • Cannabis DUI / per se THC by state
  • Cannabis DUI / per se THC laws by state
  • Cannabis DUI laws by state
  • Cannabis DUI / per se THC map
  • Cannabis DUI / per se THC traveling across state lines
  • does cannabis dui / per se thc change by state
  • THC DUI limit by state
  • cannabis DUI laws
  • can I drive after using marijuana
  • per se THC driving
  • Cannabis DUI / per se THC in California / Texas / Florida / New York
  • is cannabis dui / per se thc legal while traveling

All 50 states

One-line traveler summary for each state. Open the map for the quoted rule and footnotes.

Alabama (AL)
Alabama: impairment standard — no published statewide per se ng/mL THC cutoff. Ala. Code § 32-5A-191.
Alaska (AK)
Alaska: impairment standard — no published statewide per se ng/mL THC cutoff. Alaska Stat. § 28.35.030.
Arizona (AZ)
Arizona: zero-tolerance — any detectable THC or metabolite while driving (A.R.S. § 28-1381).
Arkansas (AR)
Arkansas: impairment standard — no published statewide per se ng/mL THC cutoff. Ark. Code § 5-65-103.
California (CA)
California: impairment standard — no published statewide per se ng/mL THC cutoff. Cal. Veh. Code § 23152.
Colorado (CO)
Colorado: impairment standard — no published statewide per se ng/mL THC cutoff. C.R.S. § 42-4-1301 (5 ng THC is a permissible inference, not per se).
Connecticut (CT)
Connecticut: impairment standard — no published statewide per se ng/mL THC cutoff. Conn. Gen. Stat. § 14-227a.
Delaware (DE)
Delaware: impairment standard — no published statewide per se ng/mL THC cutoff. 21 Del. C. § 4177.
Florida (FL)
Florida: impairment standard — no published statewide per se ng/mL THC cutoff. Fla. Stat. § 316.193.
Georgia (GA)
Georgia: zero-tolerance — any detectable marijuana metabolite while driving (O.C.G.A. § 40-6-391).
Hawaii (HI)
Hawaii: impairment standard — no published statewide per se ng/mL THC cutoff. Haw. Rev. Stat. § 291E-61.
Idaho (ID)
Idaho: impairment standard — no published statewide per se ng/mL THC cutoff. Idaho Code § 18-8004.
Illinois (IL)
Illinois: per se 5 ng/mL delta-9-THC in whole blood or 10 ng/mL in other bodily substance (625 ILCS 5/11-501.2(a)(6)); impairment still charges below that.
Indiana (IN)
Indiana: impairment standard — no published statewide per se ng/mL THC cutoff. Ind. Code § 9-30-5-1.
Iowa (IA)
Iowa: impairment standard — no published statewide per se ng/mL THC cutoff. Iowa Code § 321J.2.
Kansas (KS)
Kansas: impairment standard — no published statewide per se ng/mL THC cutoff. Kan. Stat. § 8-1567.
Kentucky (KY)
Kentucky: impairment standard — no published statewide per se ng/mL THC cutoff. KRS § 189A.010.
Louisiana (LA)
Louisiana: impairment standard — no published statewide per se ng/mL THC cutoff. La. R.S. 14:98.
Maine (ME)
Maine: impairment standard — no published statewide per se ng/mL THC cutoff. 29-A M.R.S. § 2411.
Maryland (MD)
Maryland: impairment standard — no published statewide per se ng/mL THC cutoff. Md. Code, Transp. § 21-902.
Massachusetts (MA)
Massachusetts: impairment standard — no published statewide per se ng/mL THC cutoff. Mass. Gen. Laws ch. 90, § 24.
Michigan (MI)
Michigan: impairment standard — no published statewide per se ng/mL THC cutoff. MCL 257.625.
Minnesota (MN)
Minnesota: impairment standard — no published statewide per se ng/mL THC cutoff. Minn. Stat. § 169A.20.
Mississippi (MS)
Mississippi: impairment standard — no published statewide per se ng/mL THC cutoff. Miss. Code § 63-11-30.
Missouri (MO)
Missouri: impairment standard — no published statewide per se ng/mL THC cutoff. Mo. Rev. Stat. § 577.010.
Montana (MT)
Montana: per se THC while driving (Mont. Code § 61-8-1002) — published nanogram line plus impairment.
Nebraska (NE)
Nebraska: impairment standard — no published statewide per se ng/mL THC cutoff. Neb. Rev. Stat. § 60-6,196.
Nevada (NV)
Nevada: per se 2 ng/mL THC or 5 ng/mL metabolite in blood (NRS 484C.110).
New Hampshire (NH)
New Hampshire: impairment standard — no published statewide per se ng/mL THC cutoff. N.H. Rev. Stat. § 265-A:2.
New Jersey (NJ)
New Jersey: impairment standard — no published statewide per se ng/mL THC cutoff. N.J.S.A. 39:4-50.
New Mexico (NM)
New Mexico: impairment standard — no published statewide per se ng/mL THC cutoff. N.M. Stat. § 66-8-102.
New York (NY)
New York: impairment standard — no published statewide per se ng/mL THC cutoff. N.Y. Veh. & Traf. Law § 1192.
North Carolina (NC)
North Carolina: impairment standard — no published statewide per se ng/mL THC cutoff. N.C. Gen. Stat. § 20-138.1.
North Dakota (ND)
North Dakota: impairment standard — no published statewide per se ng/mL THC cutoff. N.D. Cent. Code § 39-08-01.
Ohio (OH)
Ohio: per se 2 ng/mL THC or 5 ng/mL marijuana metabolite in whole blood / serum / plasma; urine 10 ng THC / 15 ng metabolite (Ohio Rev. Code § 4511.19(A)(1)(j)).
Oklahoma (OK)
Oklahoma: zero-tolerance — any detectable controlled substance including marijuana (47 O.S. § 11-902).
Oregon (OR)
Oregon: impairment standard — no published statewide per se ng/mL THC cutoff. Or. Rev. Stat. § 813.010.
Pennsylvania (PA)
Pennsylvania: per se any amount of a Schedule I controlled substance, including marijuana, in blood (75 Pa.C.S. § 3802(d)).
Rhode Island (RI)
Rhode Island: impairment standard — no published statewide per se ng/mL THC cutoff. R.I. Gen. Laws § 31-27-2.
South Carolina (SC)
South Carolina: impairment standard — no published statewide per se ng/mL THC cutoff. S.C. Code § 56-5-2930.
South Dakota (SD)
South Dakota: zero-tolerance — any detectable marijuana / controlled substance (S.D. Codified Laws § 32-23-1).
Tennessee (TN)
Tennessee: impairment standard — no published statewide per se ng/mL THC cutoff. Tenn. Code § 55-10-401.
Texas (TX)
Texas: impairment standard — no published statewide per se ng/mL THC cutoff. Tex. Penal Code § 49.04.
Utah (UT)
Utah: zero-tolerance — any measurable controlled substance including THC (Utah Code § 41-6a-517).
Vermont (VT)
Vermont: impairment standard — no published statewide per se ng/mL THC cutoff. 23 V.S.A. § 1201.
Virginia (VA)
Virginia: impairment standard — no published statewide per se ng/mL THC cutoff. Va. Code § 18.2-266.
Washington (WA)
Washington: per se 5 ng/mL THC within 2 hours of driving (RCW 46.61.502).
West Virginia (WV)
West Virginia: zero-tolerance — any detectable controlled substance including marijuana (W. Va. Code § 17C-5-2).
Wisconsin (WI)
Wisconsin: detectable restricted controlled substance including THC (Wis. Stat. § 346.63) — no published ng/mL traveler cutoff above zero.
Wyoming (WY)
Wyoming: impairment standard — no published statewide per se ng/mL THC cutoff. Wyo. Stat. § 31-5-233.

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Not legal advice. Confirm statutes before you travel. Disclaimer.