LIVE: FBI Expert Robin Dreeke Analyzes Au Pair Juliana Magalhães — Is She Credible?

The prosecution says Juliana Peres Magalhães is telling the truth. The defense says she's a liar who will say anything to walk free and get paid.

She wrote jail letters promising to protect Brendan Banfield. She told his mother she'd "take the blame for both of us." Then she flipped — after Banfield was arrested, after she was hospitalized, and after Netflix came calling.

LIVE with former FBI special agent Robin Dreeke to analyze the au pair's credibility. What does her behavior on the stand reveal? How does an FBI behavioral expert evaluate a witness wit...