By the end of PoA, we find out that Lupin, Snape, and Dumbledore all knew about the passage under the Whomping Willow the whole time. So why was it not guarded (by Dementors or something/one else) since this seems like an obvious entry into Hogwarts for Black?
Update: Sorry this wasn't clear when I originally asked, but I thought it was obvious that the Whomping Willow itself was not an effective guard against Black. He already knew how to use the knob to disarm it, which we know can be done by a large stick for those going out and easily reached by those coming in.
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