Young people's encounters with the criminal justice system generally begin with the police. Officers' decisions about how to handle these encounters are affected by their on-the-spot assessments of young people's proclivity for delinquency, prospects for rehabilitation, and overall moral character. And because most police-citizen interactions occur in public spaces, officers render these judgments with limited information, often falling back on racial and ethnic stereotypes. In this article, Rod Brunson and Kashea Pegram examine how police officers' decisions about which young people to watch, stop, search, and arrest contribute to historical and enduring justice system inequality. Research confirms that officers apply their discretion highly unevenly, Brunson and Pegram write, consistently exposing youth of color to a wide range of harms. Moreover, aggressive policing strategies such as stop-and-frisk disproportionately affect youths and communities of color. In many urban areas, they say, officers are a constant, inescapable, and unwelcome presence in the lives of black and Latino adolescents--especially males, who are disproportionately stopped, searched, and killed by police. Yet the authors find reason for optimism in efforts to improve trust in minority communities and end racially discriminatory policing through practices based on procedural justice principles--that is, whether citizens believe they're treated fairly and with respect during police encounters. Still, they acknowledge, racial disparities in policing mean that in many places, police-community relations have already suffered tremendous harm that will be extremely difficult to repair.