Question to the Home Office:

To ask the Secretary of State for the Home Department, whether any UK police forces use International Mobile Subscriber Identity catchers.

We do not comment on police use of specific investigative techniques. Investigative activity involving interference with property or wireless telegraphy is regulated by the Police Act 1997 and the Intelligence Services Act 1994 which sets out the high level of authorisation required before the police or security and intelligence agencies can undertake such activity. Use of these powers is overseen by the Intelligence Services Commissioner and the Office of Surveillance Commissioners.