In Rankin v. State, 953 S.W.2d 740, 741 (Tex. Crim. App. 1996), the defendant was charged with possession of a rock of cocaine which a police officer found in his patrol car where the defendant had been sitting. 953 S.W.2d at 741. The defendant testified that he had indeed possessed a rock of crack cocaine earlier in the day, but that the rock found in the patrol car was not his. Id. The Court held that the defendant's judicial admission that he had possessed a different rock of crack cocaine on the same day was not a defense to the charged offense, nor was it an extraneous offense. Id.