There is, at present, a worldwide uncontrolled social experiment taking place within policing on body-worn-cameras, without much evidence from controlled studies Our randomized-controlled-trial aims to reveal the conditions under which body-worncameras can effect arrest dynamics in England and Wales Scholars interested in use of force should differentiate between "compliant handcuffs" which are part of the arrest procedure rather than use-of-force per se, and "noncompliant handcuffing", which form a step on the force continuum. Overall, the odds of use of force while using body-worn-cameras are 50% lower than control conditions. However, the effect is statistically significant only when compliant handcuffing is removed from the definition of "use of force". Instead, the odds of reporting compliant handcuffing under treatment conditions increased by 40% compared to control conditions, which is likely to be a result of enhanced police accountability. Overall, the effect of body-worn cameras in frontline policing is concentrated on "openend tactics" rather than more aggressive force responses (e.g., batons, Taser discharges, pepper spray, etc.).