Dr's Confidentiality
There has been much talk about the fitness to fly (and even in the UK down driving too), the problem is the individual is still the missing link, they have to make the decision on their own fitness in many scenarios.
Surely there is a case to say that Dr's should be obliged to inform an airliner/ employer/ regulatory body when a pilot is unfit to fly (or a condition affect their ability), thus cutting out a whole chain of events that would/ could occur ( from depression to sleep apnea).