Law Enforcement Tools and Technologies for Investigating Cyber Attacks: A National Research and Development Agenda. This study is the culmination of a multi-year research effort by the Technical Analysis Group at the Institute for Security Technology Studies (ISTS). In this document we present the top band of critical problem areas encountered during cyber attack investigations that may be addressed through research and development. Solving the needs outlined in this work would significantly increase law enforcement’s ability to investigate and prosecute cyber attack cases. We offer this agenda to serve as a resource for decision makers, developers, and researchers, in government, industry, and academic institutions across the country.