"There are odourless ingredients, so they would not be noticeable to an odourless potion," she mused aloud. "But any neutralising additives I can think of would affect the colour. Or the taste. At the least, when the Veritaserum was consumed, any of the Aurors not involved in the betrayal would have noticed. Unless, of course, the manipulated Veritaserum, if that even exists, was only ever taken by the mole."