New DUI law change in Indiana involves marijuana and being behind the wheel Several new laws just became effective this month in Indiana. One of them updates the policy on marijuana and driving. Posted: Jul 7, 2021 8:23 PM Updated: Jul 7, 2021 8:26 PM Posted By: Kit Hanley TERRE HAUTE, Ind. (WTHI) - Several new laws just became effective this month in Indiana. One of them updates the policy on marijuana and driving. Before July 1st if you used marijuana and a week later you got in a car wreck, and you weren't at fault, you could've faced felony charges. Indiana Senate Bill 201 changes that.