"There is - you know, there's receipts for rented cars and license plates and guns and hand prints and palm prints and fingerprints. You know, I want to wait until I'm in a court"

Patty Hearst is describing the proof that exists to show her innocence in the case versus her. She is suggesting that she wants to wait till she is in a law court to provide this evidence, that includes receipts for leased vehicles, license plates, weapons, hand prints, palm prints, and finger prints. This suggests that she believes that the evidence she has actually gathered is strong enough to show her innocence and that she is positive in her capability to present it in a law court. She is likewise implying that she is willing to take the case to court in order to prove her innocence. This quote reveals that Patty Hearst is determined to prove her innocence and is willing to go to court to do so.