Dream Buster, I have in the past participated in the reviews of a number of the fune and incapacitation incidents that have been referred to; and my personal conclusion is that there is indeed a significant issue that needs to be addressed and which some people unfortuantely appear more prone to. However, behind the allegations of industry cover-ups, I have yet to be convinced that there is adequate understanding of exactly what are the causes and hence the appropriate solutions. And I don't believe that this is through a lack of industry testing and analysis. Hence my quite genuine desire to know what it is you believe we should be filtering against?
I am not disagreeing with you that there are people with severe medical issues and that something should be done based on sound investigations. But I am frustrated to keep hearing the same knee-jerk campaigns that seem to suggest that the industry already knows what the problem is and how it should be fixed. The only 100% safe solution I know of, where there would never be a risk of oil contamination, would be to ground all current generation aircraft that use engine bleed air...