Did Casey Anthony steal the drowning story from a jailmate? Sunny Hostin explains

More twists and turns in the murder trial of Casey Anthony.

While the defense tries to discredit forensic evidence against the suspected child killer, prosecutors are pulling a surprise move - unveiling a potential new witness who served time in jail with Anthony. Prosecutors believe Anthony heard this inmate's story about how her son had drowned, and Anthony thought she could use it in her defense.

This morning on American Morning, In Session's Sunny Hostin explains this theory to Carol Costello and Kiran Chetry.