So I was wondering. Remember how in OotP, Harry stood trial for casting the Patronus Charm underage? The idea was that the Ministry can't detect who had done magic, just that it was done. What about Mundungus Fletcher's Apparition on that same evening? How come the Ministry warned Harry for Dobby's spell in CoS, but only tried him for the Patronus Charm in OotP, as though Dung's Apparition hadn't happened? Is it just that they assumed he couldn't possibly have Apparated since that's 6th-year level magic? But then why couldn't Dung have lied and said he'd cast the Patronus Charm, as well, just to get Harry off the hook?