In Chapter 20 of Harper Lee's To Kill a Mockingbird, Atticus Finch argues that the case should not have come to trial and that no medical evidence exists which links Tom Robinson to the crime. He indicates that he feels sorry for Mayella Ewell, but that her accusation of Tom Robinson was and is a false one. Atticus also notes that the person who beat Mayella predominantly used their left hand, whereas Tom Robinson only has use of his right hand.
Atticus also attacks the notion that all Negroes behave in a certain way and that all people, regardless of their skin color, sometimes make mistakes and sometimes do evil things:
"There is not a person in this courtroom who has never told a lie, who has never done an immoral thing, and there is no man living who has never looked upon a woman without desire."
Finch concludes by noting that just as all humans have their flaws, so too, no court is perfect. Therefore, he urges the jury to review the evidence in the case in an impartial manner and "In the name of God, do your duty.”