Did Police Believe Casey Anthony Was Speaking to Her Father in Code?

Today the jury in the Casey Anthony trial watched surveillance tape of a dramatic prison visit between Casey Anthony and her father George. But are they speaking in code?

George Anthony tells Casey detectives videotaping the visits believe they are.

George Anthony: "They think we're speaking in code or we're sending some kind of signals to each other. We're not."
Casey Anthony: "We're not."

George tells his weeping daughter that Caylee is still alive.

George Anthony: "I know she's close. I can feel her every night before I go to bed. I go out and I say, 'Caylee you are the moon, the stars, and the sky, sweetheart.' "

At the time of the taping, Caylee's third birthday was just days away.

George Anthony: "I want to have that big party for her. We were first having just a little one but we're going to have a big one, you know?"
Casey Anthony: "Well, I want to be home so we can do that, Dad."

"She says, 'Oh I want Caylee found, I want her to come home,' at times, but then she always reverts back to, 'I want to come home, I'm not happy being here, I want to come home,' and it's really all about her," says Aphrodite Jones of True Crime with Aphrodite Jones.

At one point, George tells Casey he wishes he had been a better dad.

George Anthony: "I'm sorry I've been so tough sometimes. I'm sorry."
Casey Anthony: "Dad, it's not your fault. It isn't. We all do things out of love and sometimes..."
George Anthony: "Some tough love, I know."
Casey Anthony: "You know how much I love you, how much I've always loved you. You'll always be my buddy even besides my dad."