It is inadmissable, as it is unscientific. I'm cross-domanat *raises right hand, quirks left eyebrow*. When I'm bs-ing someone, I look them dead into the eye that is probably dominant, based on thier obsderved handedness, and let them wilt under my gaze.

Oh, wait, I do that most of the time.

If were you were looking during a first questioning was all the probable cause an officer could come up with for giong forward, and you didn't walk, your lawyer wasn't trying.