With healthcare I see similar scenarios. We had x patients in our facility for this concern (broken leg, infection, etc.). How long did it take for us to release them? What medications did we use? What were the doses of medication? What was the overall cost for their stay? In these situations, maintaining the data after the event and reviewing it to learn from it is a method that is valuable and, based on some of my colleagues from past lives, something that is sometimes done (unfortunately, not often enough).
When dealing with services, there are often checks and balances that can be cross-referenced. Once the data is checked, confirming that those generating the data have the adequate resources and training to ensure data quality is crucial.