According to your textbook, what kind of supporting material is used in the following speech excerpt: imagine yourself driving down the freeway on your way to work. you see lights flashing in your rear-view mirror. you turn to see the police officer pulling you over. were you speeding? no, says the officer, but he needs to search your vehicle as part of a new program to stop drug trafficking. does he have a warrant? he says he doesn’t need one. you protest, but the officer carries out his search anyway. the officer finds nothing, but by the time he is done, you are very late for work.