From the same perspective though, when you get these individuals who are so abnormal in their thinking and behaviour, and also so deliberate, it's not easy to design systems that will catch them out.
Prof. Spiegelhalter has written and demonstrated that, after the Shipman enquiry, it was possible to confirm that colleagues had reported concerns early on - and statistical tools would have validated their concerns.
Most strikingly, Spiegelhalter describes his experience designing a statistical model that, had it been implemented before the murders began, would have flagged up the alarmingly high mortality rate among Harold Shipman’s patients. He concludes that using his model would have stopped Shipman’s spree by 1984, saving 175 lives. www.spectator.co.uk/2019/04/i-could-have-stopped-harold-shipmans-killing-spree-and-saved-175-lives/
If anyone had been running a straightforward monitoring analysis of Paterson in both his NHS and private practices, I wonder if this would have shown up a long time ago and prompted an audit?