Maryland's legislature passed a measure in its final session on 11 April, and Governor Martin O'Malley signed the measure on 10 May, that will extend in-state tuition to undocumented immigrant students who meet certain criteria. To qualify, the undocumented immigrants must have attended Maryland high schools for at least three years and their families must pay state taxes. Under the measure, the students could pay in-state tuition rates at community colleges for two years, at which time the students could transfer to a four-year college and retain the in-state rate. Maryland became the 11th state in the U.S. to grant such rights to undocumented immigrants, but opponents have already began collecting signatures to put the measure on the 2012 ballot.