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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...