California Proposition 187 (also known as the Save Our State (SOS) initiative) was a 1994 ballot initiative to establish a state-run citizenship screening system and prohibit illegal immigrants from using non-emergency health care, public education, and other services in the State of California. Voters passed the proposed law at a referendum on November 8, 1994. The law was challenged in a legal suit the day after its passage, and found unconstitutional by a federal district court on November 11. In 1999, Governor Gray Davis halted state appeals of this ruling.