Cheney Mason Threatens Mistrial?

From a page of Jose Baez' upcoming book "Poker for Dummies", Cheney Mason has blustered his first of likely more to come, threats of "mistrial."What is the basis for this one?Something about Casey's demeanor is not sitting right with Mason. She was happy go lucky, not working and living off of other peoples' money before she killed Caylee, and then after, she was happy go lucky, not working, and