Harold Shipman with the NHS killed about one person per month for 30 years, and the response was to ask if doctors could be monitored to discover this earlier.

Harold Shipman with the NHS killed about one person per month for 30 years, and the response was to ask if doctors could be monitored to discover this earlier. However, the systems they conceived "eventually cast suspicion on the innocent". 25 years later the NHS is still struggling to answer these questions.