Did her lawyer ask for a mistrial based on lack of Miranda? (If he did, I missed that.) I know he's been asking for a mistrial this week, but don't know on what basis. (I haven't been able to watch that much the last few days.) From what I understand, Miranda is given when someone is officially arrested, not during routine questioning.
The reason all the abuse allegations made by Casey are being presented in court is to create a defense as to why she didn't report her child missing for so long. They had to have some kind of explanation for why (their story) of an accidental drowning would go unreported. I can't figure out why they dragged George into the whole situation other than the insinuation the defense presented regarding Casey's brother and the DNA test of Caylee. Casey's lawyer did say that the pregancy was hidden like a "flower in the attic" (referencing that book where unwanted children were hidden in the attic). So, the defense may be trying to say the child was her brother's and had to be hidden from an autopsy at any cost (where a DNA test may be done). So, that's why Casey and her father hid the child rather than call the police.That's just a wild guess though, cuz much of this case is totally confusing. Her lawyer's opening statement was vague and filled with insinuations.
I'm not saying that I buy any of that story, just saying what the defense may be thinking. Personally, with all the lies that Casey's told in the past--who could believe anything she says? She may even be one of those people who lies so much they begin to believe their own lies. She lead the police into a place she said she worked at and walked all the way down the hall, only to turn around at the last minute to tell them she really didn't work there--very strange! Personally, I don't see the defense having much chance of swaying anyone after they listened to Casey say how great her parents were on the jailhouse videos, then turn around in court and say they were abusive. All that does is prove what a liar she is.