A lot of the suggestions in this thread sound like a solution in search of a problem. Yes admittedly this happened once but how likely is it to happen again? Yes, we can learn from this accident, but I don't think many pilots will spend the rest of their working life being completely paranoid about their colleagues. There are better ways to improve aviation safety imho, that will yield better results. Overworked, tired pilots, unstabilized approaches, get-there-itis, while miniscule threats to safety judging by the numbers of accidents, still seem like a vastly bigger issue, realistically