Doesn't Voldemort know about Snape's loyalty?

[gelite67]

No: HPFGUIDX 107329

Potioncat:
> But LV did not reveal himself to anyone.  Quirrell hadn't been a 
DE, 
> he had been "recruited" more recently.  If Snape suspected 
> something, he most likely made it appear that he wanted the stone 
> for himself. I doubt that between Snape and Quirrell the LV-DD 
> situation even came up.

Angie (still wondering):
 Does this beg the question of why LV didn't try to use Snape to get 
the Stone if Snape was working for LV?  I know according to DD Snape 
is trustworthy, but I've read different theories about Snape working 
as a double agent, etc.  Just a thought.  Guess that would have made 
for a one-book series, wouldn't it?