Washington D.C. police department latest force to adopt radio encryption. Criminals are listening in to police conversations using cheap apps on mass-market phones. Journalists are keen to use radio traffic between emergency and police teams as a way of getting ahead on news stories. Some police forces are adopting a mixed approach, with some secure and others open. The system used for encryption on US radio communications at this level is ACPO P25, which adds complexity (such as key management and distribution) and expense.”]