Camera Power is the first book to tackle the policy questions raised by two ongoing revolutions in recording the police: copwatching and police-worn body cameras. Drawing on original research from over 200 jurisdictions and more than 100 interviews - with police leaders and officers, copwatchers, community members, civil rights and civil liberties experts, industry leaders, and technologists - Mary D. Fan offers a vision of the great potential and perils of the growing deluge of audiovisual big data. In contrast to the customary portrayal of big data mining as a threat to civil liberties, Camera Power describes how audiovisual big data analytics can better protect civil rights and liberties and prevent violence in police encounters. With compelling stories and coverage of the most important debates over privacy, public disclosure, proof, and police regulation, this book should be read by anyone interested in how technology is reshaping the relationship with our police.