According to the recent report on Operation Alice, the Met’s investigation into ‘plebgate’, the rather unfortunate ‘incident in Downing Street involving the Rt. Hon Andrew Mitchell MP and police officers from the Metropolitan Police Service Diplomatic Protection Group (DPG)’, a significant element of the evidence against some of the officers involved came from Sun journalist Tom Newton Dunn.
Tom didn’t betray his sources – his phone did.
As part of the investigation ‘the telecommunications data in respect of Tom Newton Dunn was applied for and evidenced’ (para 5.120 of the Operation Alice report, PDF here thanks to Jack of Kent).
And that is why journalism isn’t really possible any more.