HB1160

South Dakota law now makes it illegal to drive with 2 nanograms or more of delta-9-tetrahydrocannabinol (THC, the active ingredient in marijuana) per milliliter of blood, similar to existing drunk driving limits. This adds a specific legal threshold for THC impairment to the state's impaired driving law, so drivers can be charged based on a measurable blood test result rather than only on observable signs of impairment.