Law enforcement use of video-based technology has substantially increased over the past decade. This systematic review examines the current evidence base for efficacy of body-worn video and the current case for implementation. Five articles were identified as pertinent to this review from a search of five electronic databases, with a further six articles of grey literature included. Inter-rater reliability was high amongst three independent screeners of literature. Articles were short listed for review if they explicitly identified police and recording devices as topic areas. Articles were then excluded if they did not involve an operational trial of body-worn video. Eleven articles were included for review; of the five peer-reviewed studies, two were randomised controlled trials. An abundance of evidence was provided; however, the majority of articles were methodologically weak. Body-worn video was shown to reduce use of force incidents, crime rates for certain crime types and court costs. Public response to body-worn video was varied, as was police officer and public opinion. Due to methodological limitations evident in most studies and the general lack of peer-reviewed material, further research is required; however, there are some considerable benefits reported in the current literature.