You shouldn't have to send transcripts to most schools (I can't say with certainty that none of them will). When AMCAS verifies your grades w/ your transcript, they are certifying to the schools that the grades and courses on your application are legit according to your transcript. None of the schools I applied to asked for transcripts at any time during the application procedure. Once you are accepted, though, you will have to provide the school you are matriculating at an official copy.