I'm not at all surprised that no pathology or toxicological tests were made.
In 2006 UCL (University College London UK) tested 27 BAe 146 and B 757 pilots and found they
all had highly abnormal amounts of toxic chemicals in their blood / fat and measurable cognitive dysfunction.
http://www.aerotoxic.org/download/do...ne%20paper.pdf
Would you look for the vital clue that would explain a fatal accident - If the results were inconvenient. Perhaps they forgot?
Cover up and they know it - but how do they continue to get away with it?
DB