Lucius refrained from rolling his eyes, though his son did have a point. It did keep people from asking important questions. That didn't mean he wanted to discuss it with Draco, however.
He was pleased when Draco seemed to be satisfied with the test and handed him the vial without hesitation. 'Of course I do,' he said with a smile. 'I look forward to meeting her finally,' he said, not letting there be any doubt of who would administer the potion. He'd been giving strict orders to make sure the potions was taken under his supervision - and that the vials was brought with him back. He had no intentions of not following those orders.