Securing reliable evidence and intelligence is critical for delivery of justice and protecting national security. Professor Hope and colleagues developed the Self-Administered Interview and Timeline Technique as innovative investigative tools to elicit comprehensive memory accounts from witnesses, victims, and informants in time-, resource-, and security-critical contexts. These tools have been adopted into policy in the UK (e.g. College of Policing), US (e.g. FBI) and Europe (e.g. Sweden), leading to improved practice and training in police forces and national security agencies. Operational personnel confirm a range of impacts, including significant contributions to national security in both the UK and US.