Dumbledore's trust for Severus Snape.

[houyhnhnm102]

No: HPFGUIDX 138379


> Finwitch:
[...]
> 
> As for that, Dumbledore does use Legilimency when he doubts - 
> Harry's experienced this often enough.
> [...]
> As for Snape - well, he's an Occlumens and he hasn't 
> given Dumbledore a reason not to trust him. And don't 
> forget that Crouch Jr. managed to fool Dumbledore to 
> think he was Alastor Moody for a while... I think it 
> possible that Snape could use the same sort of trick 
> as Tom did with Harry: showing him memories that made 
> it seem that Hagrid had been the guilty one.

houyhnhnm:

Dumbledore doesn't rely solely on legilimency to determine the truth.
 He also uses observation and logic.  The exposure of Fake Moody is a
good example.

"The real Moody would not have removed you from my sight after what
happened tonight.  The moment he took you I knew--and I followed."
(GoF, AE, p. 680)

Dumbledore discovered that Moody was a fake because his action was
inconsistent with what the real Moody would have done.  Surely, he
would analyze Snape's behavior in the same way, especially since he
knows that Snape excels at occlumency.