David Gale: There once was a lesbian from Cancun/ who took a young man up to her room/ where they argued all night/ as to who had the right/ to do what and how much and to whom.
Zack: 73% of all serial killers vote Republican.
David Gale: They wanted me to die, knowing the key to my freedom was out there somewhere.
Berlin: Did I tell you that when you were circumcised they threw away the wrong part?
David Gale: Yes, I believe you mentioned it. It's called schmuck.
Berlin: What?
David Gale: Part of the foreskin they throw away after circumcision, I believe it is called schmuck.
Berlin: Aren't we so fucking clever.
Bitsey Bloom: Hate's no fun if you keep it to yourself.
Constance Harraway: The TA just finished transcribing all the governor's radio and TV comments. Listen to this gem: Journalist - "Governor, don't you think three executions in one week is a little excessive?" Governor - "I say let's bring them in, strap them down, and rock and roll."
David Gale: Oh, it's good to know our governor is in touch with his inner frat boy.
Bitsey Bloom: You know you are in the bible belt when there are more churches than Starbucks.
Zack: When there are more prisons than Starbucks.
Ross: As the poets have mournfully sung/ death takes the innocent young/ the screamingly funny, / the rolling in money, / and those who are very well hung.
David Gale: Death is a gift.
Constance Harraway: Stop that.
David Gale: What?
Constance Harraway: Active listening, I hate active listeners. I always feel like they're to busy pretending to be listening to hear what I'm saying.
David Gale: I can listen and actively listen at the same time. I'm good at that.
Answer: I believe that she was a plot device to make sure David Gale had nothing to lose by the end of the movie. She then may have felt guilty about casual sex, and tried to get back at Gale. She then later felt guilty about the whole charade, and wrote him a postcard admitting what she had done. Then the postcard is given to the ex-wife to show he was innocent of rape.
Richard Welty
David had asked Bitsy and, presumably, Dusty, to preserve his son's memory of him. So they/he/she forwarded the postcard from Berlin so his ex would know he was innocent of the rape charge. Along with money for his son.