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The increasingly complex radio spectrum environment is changing the sources and nature of interference threats to an increasingly important resource. At the same time, new and evolving technologies and processes hold great promise for mitigating these threats to the critical spectrum resource and the systems that rely on it. On November 14, 2013, the Silicon Flatirons Center convened a group of about two-dozen spectrum experts with a wide variety of backgrounds and expertise. This group considered the threats and potential solutions for improved spectrum enforcement and developed associated findings and framed recommendations for the Federal Communications Commission (FCC), the National Telecommunications and Information Administration (NTIA), the White House, Congress, and other policymaking groups.