I know that Voldie doesn't know that Snape is a spy or he'd be dead,
or if he did know he could use Snape to get into the Order plans and stuff.
But I agree with what turbotriple_power said: "But if Snape is a spy and he is using polyjuice potion to look like crouch well did LV suspect him because he wasn't there in the departement of mysteries?
I mean i would think that if the real Crouch was still alive he would've went, no?"
BEcause Crouch was "his most faithful death eater"

So, either that Snape's not actually a deatheater and hanging with Voldie and his morons, or he's just not in Voldie's inner circle
