I feel like Ethics is used to try to prove people innocent, and is a must know thing in the story.
Devin Vice 2nd Hour
PROCTOR: Then let you come out and call them wrong. Are you our minister or MisterHale? Did you consult the wardens of the church before you called the minister to lookfor devils?
PARRIS: He is not coming to look for devils!
PROCTOR:No more! I should have roared you down when first you told me your suspicion. But i wilted, and, like a Christian, I confessed. Confessed! Some dream I had must have mistaken you for God that day. But you're not, you're not, and let you remember it! Let you look sometimes for the goodness in me, and judge me not.
DANFORTH: You are in all respects a Gospel Christian?