
"wonder what they would have had to have done to actually be investigated."
Well, two police officers (DCS Dave Cook and DC Jackie Haynes) were targeted and followed by the News of the World and the police did nothing, except have a lunch meeting with the NotW editor at the time and told them to stop. Nothing else happened, no investigation or fines or punishment of any kind.
Sherlock Holmes, 'cos he'd be spinning in his grave if he had one.