http://www.guardian.co.uk/world/2008/nov/05/uselections2008-michigan-marijuana-abortions-southdakota-michigan-massachusetts
...Michigan became the 13th state to legalise marijuana for medical use, while Massachusetts decriminalised possession of one ounce or less of the substance, making the offence punishable with a citation and a $100 fine...
http://brd24.net