It may affect your driver's license. You should speak with an attorney.
Did you take a breathalyzer?
Did they find and open alcohol on or about your person?
Why were you approached?
More info is needed. Talk to a lawyer.
I agree with all of the other attorneys. You may wish to read this PDF which I report on my website www.ZippToCourt.com which explains the Illinois Graduated License Program. http://zipptocourt.com/uploads/IllinoisGraduatedParent-TeenDrivingGuide.pdf
This answer is marginal legal advice and does not constitute an attorney-client relationship. Every client and case is unique. The best advice is to always consult with an attorney. Free legal resources at www.ZippToCourt.com