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The Fidelius Charm: Harry's folks were killed by Lord Voldemort in light of the fact that he had the option to discover their concealing spot after their Secret Keeper Peter Pettigrew double-crossed their area and broke the Fidelius Charm. In "Harry Potter and the Deathly Hallows," Bill Weasley and Arthur Weasley turned into their own Secret Keepers: Bill for Shell Cottage where he lives with his significant other Fleur and Arthur for Aunt Muriel's home

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It doesn't bother me that people don't react to Transfiguration and polyjuice potions in their day to day. People routinely do absurd things from a security perspective in their day to day now.

What I take issue with is that places like the ministry of magic does not have safe guards in place to prevent them. If four high school kids can create the marauders map that can correctly identify anyone in Hogwarts, wouldn't there be one of that at numerous check points throughout the ministry of magic?

One of them at the entrance to Gringotts?

If not a map, some other sort of detection process that uses the same principles?