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Body-worn cameras to prevent workplace aggression among ticket inspectors: Protocol for a randomized controlled trial
Camilla Bank Friis1, Merlin Schaeffer2,3, Juliane Starcke Neergaard1
1Department of Society and Politics, Aalborg University, Copenhagen, Denmark.
Plos One
|February 3, 2026
Summary
Body-worn cameras may reduce workplace aggression for frontline workers. This study tests their effectiveness among Danish ticket inspectors, offering insights beyond policing contexts.
Area of Science:
- Occupational Health and Safety
- Criminology and Criminal Justice
- Human-Computer Interaction
Background:
- Frontline and service personnel face high rates of workplace aggression.
- Body-worn cameras (BWCs) are increasingly used for prevention, but evidence is limited and concentrated in policing.
- Generalizability of BWC effectiveness across different occupational settings is uncertain.
Purpose of the Study:
- To test the preventive effect of body-worn cameras on workplace aggression.
- To evaluate BWC effectiveness among public transport ticket inspectors in Denmark.
- To explore the impact of visible recording notifications on aggression.
Main Methods:
- Randomized controlled trial involving ~60 ticket inspectors across three Danish transport companies.
- Shift-level randomization with ~3,000 total shifts analyzed.
- Comparison of wearing a BWC versus not wearing one; secondary analysis of visible notification badges.
Main Results:
- Analysis comparing BWC use versus no BWC use across all companies.
- Secondary analysis examining the effect of visible recording badges in two companies.
- Qualitative insights from field observations on camera influence on interactions.
Conclusions:
- Presents a unique randomized controlled trial on BWC effectiveness outside U.S. policing.
- Findings will inform practical deployment of BWCs to mitigate workplace aggression.
- Potential to enhance safety for frontline workers in public transport and similar sectors.
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