Peter - I think the thrust of the campaign is for exactly that - clarity. I believe blood tests can establish organo-phosphate exposure, but I do not think they are done on pilots who report 'fumes'. Should they be? 'Evidence' is at the moment largely circumstantial.
I understand that organo-phosphates are present in aero-engine synthetic oils and that O-Ps can cause cancer. I would like to see some sort of study to see if the two are linked in aviation.