Legal THC Level for Driving in Each State

What is the Legal THC Limit for Driving?

The legal THC limit for driving varies significantly across the United States. Most states have set a limit similar to the blood alcohol concentration (BAC) limit for alcohol, typically around 5 nanograms per milliliter (ng/mL) of THC in blood. However, a few states have set stricter limits, with some states having a zero-tolerance policy.

Does Coffee Help You Drive High? Caffeine and Cannabis Impairment Explained

State-Specific THC Limits

  • California: 5 ng/mL
  • Colorado: 5 ng/mL
  • Washington: 5 ng/mL
  • Oregon: 5 ng/mL
  • Nevada: 2 ng/mL
  • Utah: 2 ng/mL
  • South Dakota: 5 ng/mL
  • Wisconsin: 5 ng/mL
  • Wyoming: 2 ng/mL

Zero-Tolerance States

  • Alaska: Zero-tolerance policy
  • Arizona: Zero-tolerance policy
  • Arkansas: Zero-tolerance policy
  • Idaho: Zero-tolerance policy
  • Indiana: Zero-tolerance policy
  • Mississippi: Zero-tolerance policy
  • New Hampshire: Zero-tolerance policy
  • New Mexico: Zero-tolerance policy
  • Rhode Island: Zero-tolerance policy
  • Utah: Zero-tolerance policy