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 smoking. dr. stanton glance has been battling tobacco companies for years. he claims exponent is basically a hired gun for big business. >> if i were toyota and you wanted somebody to do this, i would have found somebody who didn't have this baggage. to get an independent assessment of toyota cars or anything else, you need to have people doing the assessing who are actually independent. >> reporter: exponent's initial report given to congress states that after testing several vehicles, they were "unable to induce, through electrical