a "clinical audit of aircrew seen for clinical purposes," and thus there were limitations to the study. the "'aircrew seen for clinical purposes' were in fact a self-selecting sample of pilots." meaning that they all came from a group that already believed they had been damaged by contaminated air. that self-selected sample group "was not compared to a control group." ross herself said "the conclusions that can be drawn from these findings have limitations." she further stated: "the author ... makes no attempt to ascribe causality." the report's conclusions were ambiguous: "there was no evidence of ... global intellectual decline, language or perceptual deficits .... indeed pilots were intact on the vast majority of tests. however, there was evidence of under-functioning on tests associated with psychomotor speed, executive functioning and attention ...." and finally, "he evidence available to us in this audit does not enable us to draw firm conclusions regarding a causal link with exposure to contaminated air." in 2015, tim van beveren made a documentary on aerotoxic syndrome called unfiltered breathed in. former british airways captain tristan loraine bcai has produced a number of documentaries on the subject matter through fact not fiction films. titles include 'welcome aboard toxic airlines' (2007), 'broken wings' (2011), 'angel without wings' (2010), 'a dark reflection' (2015) and 'everybody flies' (2019). journalist kiera feldman published an extensive article on the subject in the los angeles times on 17 december 2020.