Phone hacking was once dismissed by executives at News International as the illegal work of "one rogue reporter". The defence collapsed with one journalist at the News of the World being sacked and the original police inquiry having to be re-opened. Panorama exposes the full extent of the "dark arts" employed by journalists across the industry to get their story. The programme reveals a dishonourable history of law breaking that went beyond phone hacking and questions the police inaction that let it continue.