According to this story on Delaware Online:
Once, he [Kurt Busch] said, they were in El Paso, Texas, where [Busch’s ex-girlfriend Patricia] Driscoll had left that night in camouflage and boots. She returned later to the hotel at which he was staying wearing a trench coat. Under it she was wearing an evening gown splattered with blood and other matter, Busch testified.
Neither Driscoll nor her attorney refuted the claims during the hearing.
So there you have it.