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>> it's the pattern that really nails it down to the engine oil. this is the pattern you'll find the engine oil and this is the pattern you'll find in the swab sample you took from the aircraft. >> tim has analyzed surface swabs from 40 different flights and says he almost always finds tcp. >> and on virtually all of them? you find it? >> pretty much so, yes. significant levels. >> reporter: significant, but not large. the biggest amount we found, 44 billionth of a gram. not enough to have consequence. our air samples do not show any traces of tcp. that means toxic residue has collected on the...

Aircraft. >> reporter: tim mah has analyzed surface swabs from 40 different flights and says he almost always finds tcp. and on virtually all of them you find it? >> pretty much so, yes. they are at significant levels. >> reporter: significant but not large. the biggest we found, 44 billionth of a gram. our air samples do not show any traces of tcp. that means toxic residue has collected on the surface of the cabin from either a prior fume event or from gradual continual accumulation of toxins. >> there is a fair amount of remnant material floating around literally in the ventilation system. t...

Producer lauren dolan's hair. he measured it with a device that measures molecular weight and composition. the result? the cabin surfaces do contain tcp, which is in engine oil. >> it's the pattern that really nails it down to the actual engine oil. this is the pattern you find the engine oil, and this is the pattern you find in the sample that you took from the aircraft. >> jim na has analyzed surface swabs from 40 different flights, and he says he almost always finds tcp. >> on virtually all of them you find it? >> pretty much, yes. the weights are at significant levels. >> significant, but ...

Surface swabs from 40 different flights and always finds it. the biggest amount we found, 44 billionth of a graham, not to have any kind of health consequences. air samples do not show traces of tcp, and that means toxic residue collected either from a prior event or from an accumulation. >> the material is floating around literally in the ventilation system and this comes out on a regular basis, and that's what you are measuring. >> reporter: so even if the flight you are on has not had a fume event, there are toxic fumes in the ventilation system and it's coming out? he explains, when engine...

Extract whatever is captured. they analyze some of the producer's hair to see if it collected toxins from her seat back. the finding? the swabs of the air cabin service do contain the neuro taux neurotoxins. >> this is the pattern you will find in the swab sample that you took from the aircraft. >> tim analyzed surface swabs from 40 different flights and says he almost finds tcp. >> you find it on virtually all of them? >> yes.