Look, Draco, I’ll take one drop of Veritaserum if you can get it, I’m just warning you that I’m an Occlumens. Not a perfect Occlumens, but Mr. Bester said I was putting up a complete block, and I could probably beat Veritaserum.”
Your question made me realize: Lucius quite probably is assuming Harry is a perfect Occlumens. Meaning it would be counterproductive to try to get the court Legilimancer to prove he could beat Veritaserum- he could beat her too. The trouble would be that no one else, possibly not even Dumbledore, would believe that Harry is a perfect Occlumens. Harry could offer to testify under Veritaserum and say whatever he wants, in which case Lucius is in a bit of a pickle.
Waaay back in Chapter 47, we get:
Your question made me realize: Lucius quite probably is assuming Harry is a perfect Occlumens. Meaning it would be counterproductive to try to get the court Legilimancer to prove he could beat Veritaserum- he could beat her too. The trouble would be that no one else, possibly not even Dumbledore, would believe that Harry is a perfect Occlumens. Harry could offer to testify under Veritaserum and say whatever he wants, in which case Lucius is in a bit of a pickle.
That what I was thinking. Prediction for Harry claiming to be responsible.