Allows federally recognized Native American tribes to operate roulette, dice games, and sports wagering on tribal lands, subject to compacts negotiated by the Governor and ratified by the Legislature. Beginning in 2022, allows on-site sports wagering at only privately operated horse-racing tracks in four specified counties for persons 21 years or older. Imposes 10% tax on sports-wagering profits at horse-racing tracks; directs portion of revenues to enforcement and problem-gambling programs. Prohibits marketing of sports wagering to persons under 21. Authorizes private lawsuits to enforce other gambling laws. Summary of estimate by Legislative Analyst and Director of Finance of fiscal impact on state and local governments: Increased state r...