i talked about that finding with former gm employee william mcaleer. r spent 36 years working for gm, a portion of him as the head of a corporate quality audit. in 2002 he warned the entire gm board of directors of safety defects in gm cars concerns he says were not acted upon. here's more of that exclusive interview. >> my reading of the report without your area of expertise and without your knowledge of the subject matter, i'm just a lay person when i take a look at it, but it seems as if there was one particular engineer who knew or had reason to know there was a problem actually changed the design of a particular part but did so without changing the corresponding part number in an effort, maybe, to hide that which he had done. how are you ever going to be able to weed out that kind of, for lack of a better description, bad apple? >> i'm not sure we're dealing with a bad apple here. i think that what he did was, he repaired the problem he had without admitting that it was a problem. and i actually believe the environment he was in required him to do