As technology evolves, policing faces new challenges protecting the rule of law and victims online, while serving the online community; in Europol’s latest Spotlight position paper, Dr Mary Aiken, Professor of Forensic Cyberpsychology at the University of East London, and Dr Philipp Amann, Head of Expertise & Stakeholder Management at Europol’s European Cybercrime Centre, explore these key challenges, and consider the question of where to draw the cyber blue line.