Well here it is, thanks to National Institute on Alcohol Abuse and Alcoholism. The Alcohol Policy Information System (APIS) provides detailed information on a wide variety of alcohol-related policies in the United States at both State and Federal levels. Detailed, state-by-state, information is available for the 33 policies listed below. APIS also provides a variety of informational resources of interest to alcohol policy researchers and others involved with alcohol policy issues.
You can look up the current law in every state in the union here. But to save you time here is the one for Illinois!