It sometimes vexes police lawyers – how the police can be a prosecutor for the purpose of malicious prosecution when it is the Crown Prosecution Service that makes the decision to prosecute. Further, it has not always been easy to identify what acts of officers can result in liability for misfeasance in a public office. In Rees v Commissioner of Police for the Metropolis [2017] EWHC 273 (QB), Mitting J explained both of these – disagreeing with some previous cases and explaining others.