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Legal Advice on Driving Under the Influence of Cannabis

Question: Under Illinois’ new medical marijuana law, is it legal for motorists to drive with cannabis in their system?

Answer: For the first time, a person can legally drive in Illinois with cannabis in his or her system, as long as the driver is not impaired. The Medical Cannabis Act makes important changes, but it also introduces inconsistencies into DUI law that are likely to inspire litigation.

Anyone with a question about a legal matter can talk to a lawyer at no cost on the Illinois State Bar Association’s 33rd Annual Ask-a-Lawyer Day on Saturday, April 26, from 9 a.m. to noon. Contact options include two toll-free numbers, Skype and email. For details, visit

For more information about Illinois law, visit If you have a legal question, send it to

Illinois Law Now is a series of newspaper and internet posts prepared by the Illinois State Bar Association that address legal issues of interest to the public. For additional information about the law, visit