Welcome to Harry Potter Theory. Today, we'll be going for a deep dive into how Lord Voldemort never figured out that Severus Snape was a double agent whose true loyalties lay with Albus Dumbledore and The Order of the Phoenix.

As revealed at the very bitter end of the Harry Potter series, Professor Severus Snape was one of the most successful turn cloaks to have ever lived. Becoming a follower of Voldemort - and officially a Death Eater - shortly after leaving Hogwarts School of Witchcraft and Wizardry, Severus was a wizard deeply entrenched in the world of Dark Magic from a rather young age. Before he became enamoured with the Dark Lord and his teachings, however, Severus' first love was that of the Muggle-born witch Lily Evans. And so when Snape learned of a prophecy that inevitably sent Voldemort after the woman he loved, and set into motion a series of events that would result in her death, Severus chose to alter his allegiance and instead work for the very group of witches and wizards set on destroying Voldemort - while pretending to remain a faithful servant to the Dark Lord.-

But how is it that the wizard many believed to be one of the most POWERFUL to have ever lived never managed to figure out that Snape wasn't truly on his side? Well, I believe that the answer to this question is actually a bit more complex than one might first think. To which end, I've put together a few ideas I've had on the subject, starting with...

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