Two U.S. Congressmen have sent letters to Toyota Motors Inc., questioning whether or not the company had any basis for claiming it was �??confident�?� of no defects in its electronic throttle controls or other systems. U.S. Reps. Bart Stupak and Henry Waxman said that they have not seen any evidence that Toyota has actually tested the electronic throttle controls to prove their safety. The Congressmen are asking for empirical evidence from these tests. Questions are also being raised over how Toyota decided which vehicles were to receive an upgraded brake-override system.