The Federal grand jury thing is exactly what makes me think that Tyler's 60 Minutes interview was truthful. If he lies to the grand jury and is discovered, he loses his immunity. If he says one thing to the grand jury and another thing to 60 Minutes, it calls into question his testimony and jeopardizes his immunity. The only safe course of action was to tell the truth to both parties, or risk jail time.

All that said, fool me twice, shame on me.....