Illinois is now the twentieth state to legalize medical marijuana.
Governor Pat Quinn signed the legislation at the University of Chicago.
The four-year trial program will be the strictest the country.
Under the new law, a patient cannot be prescribed more than 2.5 ounces of marijuana over two weeks.
The prescribing doctor must have a prior ongoing relationship with the patient, and the doctor must find that the patient has one of a few dozen chronic conditions like cancer, AIDS, or multiple sclerosis.
Patients would have to buy the marijuana from one of 60 dispensing centers throughout the state and would not be allowed to legally grow their own.
The law will take effect January 1.
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