Governor Rauner has signed into law a change to the Illinois DUI law involving driving while under the influence of cannabis (marijuana).
Until this change, it was illegal to drive with any amount of cannabis in a person’s system. It did not make any difference if the person was under the influence or impaired by the drug. Additionally, the law did not distinguish between the active ingredient in cannabis (THC) and the inactive ingredient (THC-COOH). It is only the active ingredient that causes impairment. This law was commonly referred to as a ‘zero-tolerance’ DUI law.
Under the new law, it is no longer illegal to drive with cannabis in your system unless you are impaired (under the influence) by the substance. Basically, there are two ways a person can be found guilty under the new law: