Governor Quinn is expected to sign a bill today, legalizing the use of marijuana for medical purposes in Illinois.
Under the new law, a person could be prescribed no more than two-and-a-half ounces of marijuana over two weeks.
The prescribing doctor must also have a prior medical relationship with the patient.
A doctor must find that the patient has one of a few dozen serious or chronic conditions for the marijuana to be prescribed.
The new law would take effect January 1.