Domestic intelligence agencies cannot be controlled  There are no effective ways of controlling the activities of a domestic intelligence agency. With an information request, an investigated citizen has no way of being sure what the intelligence service in question actually does with the information, once it has gathered it, and whether the service actually upheld the principles of subsidiarity and proportionality as they should, because the methods used are not given out. Also, the intelligence service might promise to delete a file after a court honoured a request, but no one can ever be sure that the intelligence service didn’t make an extra, secret copy.