In this brief, Research for Action examines the prevalence of school policing in Pennsylvania schools. While data on police presence is limited, this brief is able to examine: (1) race/ethnic and socioeconomic disparities in school police staffing and spending; (2) race/ethnic disparities in referrals to law enforcement and school-based arrests by gender, grade, and special education status; and (3) changes over time in Pennsylvania's school police staffing and school-based referrals and arrests. This brief is part two of three in the "Police in Pennsylvania Schools" series, designed to inform conversations for Pennsylvania policymakers, school leaders, and other stakeholders. [For "What Impact Does the Presence of School Police Have on School Safety? Police in Pennsylvania Schools Series," see ED608041.]