Watch for the brief almost-smile that appears on Casey Anthony's face as she comes through the door and sees the media waiting for her. After that her face goes blank and she drops her gaze to the floor for a moment before looking ahead again.
What the Facial Action Coding System can tell us here is that she DOES smile for a brief moment. However, is this micro-expression of happiness a sign that she is guilty? Definitely not. Although a smile might seem to be a very odd reaction in this situation, it could be prompted by nervousness, or even fright. Sometimes people do smile when they are nervous (ever seen someone get the giggles at a funeral or other "serious" occasion?).
It's also important to remember that we do not know what she is looking at when she smiles. We know the media is there (you can hear them asking questions), but we do not know who or what else is in her line of sight. The smile could be prompted by something she is seeing, by relief at leaving, by excitement to see all the people waiting for her...the list is endless.
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