CHAPTER DISCUSSION: Prisoner of Azkaban Chapter 3: The Knight Bus

[nottelling]

No: HPFGUIDX 189446

How do you think [Ron, twins, Sirius] know where to find Harry at all?

Alla:

.. while the *magic* may not want to keep Sirius out if it knows about his innocence, Dumbledore certainly should have since he believed in Sirius' guilt so much and his beloved blood protection does not even include anything to protect Harry against somebody who supposedly betrayed his parents? 

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blackcatnocturne (entering delurk mode now):

But Dumbledore, along with everyone else, was under the impression that Sirius was a Death Eater. Therefore, I don't think he would have seen any reason to adjust the wards to deliberately guard against Sirius, because he's already "guarded against" i.e. the wards keep Death Eaters out, Sirius is a Death Eater, the wards will keep Sirius out.

Or at least I think that was Dumbledore's reasoning.