During the last 15 years, the Washington State Legislature has taken a number of steps to develop an “evidence-based” juvenile justice system. The central concept has been to identify and implement strategies shown—through rigorous research—to reduce crime cost-effectively. In 2009, the Legislature turned its attention to the mechanism through which Washington’s 33 juvenile courts receive state dollars. The Institute was directed to report on the administration of the new funding mechanism. We also summarize key policy reforms over the past 15 years that have established an emphasis on providing evidence-based programs in Washington’s juvenile justice system.