I don't think a judge will actually sing, "Liar, Liar. Pants on Fire!" but yes, Stupidhead has totally shot his credibility.
Do you have the phone records yet? Are you likely to have 'em on time?
I agree, i think the best approach is to systematically present evidence about SH's lies without any accusations so that a crystal clear picture of who he is emerges.. and with this shenanigans, that should not take very long!