toyota has been replacing gas pedals on millions of vehicles, but what of the decision to replace pedals and not electronics is actually based on dollar-driven science? that was the suspicion in congress today and now ted rowlands is keeping them honest. >> reporter: toyota is apologizing on capitol hill but it is not admitting to anything specific. in fact, an initial report given to congress this month couldn't find anything wrong with toyota vehicles. that report was compiled by a company called exponent, hired by, guess who, toyota. >> we have asked people to evaluate exponent's analysis and they said it was not a very good analysis. >> reporter: exponent is an engineering firm with the nickname "masters of disaster." when a big corporation gets in trouble, these are the guys they call to help defend them. and those big corporations read like a who's who of companies with major product or pr problems over the past decades, like exxon. when the "valdez" ran aground, exponent concluded a double-hull wouldn't have prevented a spill. exponent worked with tobacco companies, arguing against the labels warning of the hazards of