	As governor, Wilson was closely associated with California Proposition 187, a 1994 ballot initiative to establish a state-run citizenship screening system and prohibit illegal immigrants from using health care, public education, and other social services in the U.S. State of California. Voters passed the proposed law as a referendum in November 1994; it was the first time that a state had passed legislation related to immigration, customarily an issue for federal policies and programs. The law was challenged in a legal suit and found unconstitutional by a federal court in 1998 and never went into effect.