Specialized units for the assessment and management of concerning behaviors towards public figures have been set up in various jurisdictions. Their efficacy has been demonstrated descriptively and in terms of reduction in concern rates. This study of 100 consecutive cases from the Fixated Threat Assessment Centre (FTAC) in the UK uses a novel measure of outcome in the form of reduction in behaviors of concern and in police call‐outs/stops, using data culled from police and health service records. It adopts a mirrored design, comparing individuals over 12‐month and 2‐year periods before and after FTAC intervention. It demonstrates significant reductions in both numbers of individuals involved in, and number of actual incidents of, concerning communication and problematic approach, as well as police call‐outs/stops. Most results are consistent across subgroups with regard to gender, previous convictions, concern level, compulsory hospitalization and grievance‐driven behavior. Such threat assessment units reduce risky behavior and save police time and, possibly, costs. Copyright © 2016 John Wiley & Sons, Ltd.