Not yet :O
Some of the drop rates for quest items are ridiculous. I had a quest to collect Dreadhound blood. Me and my trusty imp minion head out into the wilderness of the Tirisfall Glades, spy a Dreadhound kiling a rabbit in the middle of a circle of trees, and attack. Me and my imp are down to 5% health by the time we have downed the beast, but we did it. I pull out my syringe, ready to collect a sample of the poor animal's blood, plunge it into it's twitching leg and.... no blood. Not a drop.
WHAT
THE
F***