In US courts, you can't ordinarily introduce new evidence on appeal. You can argue that the trial court made errors in applying the law, but if those errors in

In US courts, you can't ordinarily introduce new evidence on appeal. You can argue that the trial court made errors in applying the law, but if those errors involved excluding evidence, the most you can expect out of that is another trial. (And even that's pretty rare; if they were counting on being able to do that, it's a hell of a gamble.)