This document summarizes a talk on hacking 911 emergency response systems. It outlines various attacks on wired, wireless, and VoIP 911 systems, including initiating inappropriate responses, interfering with real emergencies, and conducting surveillance. Example attacks demonstrated modifying caller location data and overwhelming 911 systems with false calls. The document warns that successful attacks could negatively impact public health and safety by delaying emergency responses. It calls for technical and policy solutions like improved 911 network security standards, monitoring, and increased funding to address vulnerabilities.