Prior to what season did Major League Soccer hire its first full-time referees?
2008
Related trivia
During the 2018 MLS regular season, each team play how many games?
Going into the 2015 season, what MLS team had never missed the playoffs in its history?
Going into 2015, what Canadian was Toronto FC's all-time leading goal scorer?
Real Madrid beat which MLS team 4-1 in the 2011 World Football Challenge?
What is the name of the Major League Soccer club that is based in Colorado?
Who wore number 17 for the New York Red Bulls in the 2011 season?
Which MLS team was formed in 2004 as the first Mexican-owned pro sports team in the United States?
What joint venture was launched by the MLS and Adidas to promote youth soccer?
Toronto FC competes against what rival for the Trillium Cup?
Going into 2015, the southernmost MLS team was in what U.S. city?
What Canadian basketball star co-owned Vancouver Whitecaps FC in 2015?