Ha!
She and Posner both have amazing intuition. He deciphered ""the smirk", an obvious sign of guilt.
More obvious signs of guilt courtesy of Bugliosi:
- Leaving his wedding ring behind at the Paine house
- Not reading the newspaper in the domino room that morning
- Going to the second floor to get a Coke when he preferred Dr. Pepper
- Not being chatty with the cab driver
- Showing reporters his handcuffed hands
- Marina thinking his eyes looked guilty
- Leaving his blue jacket in the domino room
- Leaving a clipboard on the sixth floor