re: Diving into the Economics and Politics of the Wizarding World of Harry Potter

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Also they can apparently track people who use magic (underage wizards), so do they keep tabs on everyone?

If they do how have some bad people been free for so long? They are making kids get licenses for apparating in the 6th book but it's never mentioned again, can they track apparition use?

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They don't track everyone, they don't even track all underage wizards/witches. Underage witches and wizards are tracked with "the trace." It only detects if magic is performed near the child, doesn't even have to be the kid (see CoS with Dobby.) It is really only monitored for kids who live with muggle parents, it is up to the wizard families to monitor their children. This was stated in the books. Nothing is known about how or why the trace is put on the kids and why it breaks immediately at 17.

Apparition can only be tracked if a person grabs hold of the person apparating. They require a license due to the dangers of apparating. I think they only time you can get charged with apparating without a license is if you splinch yourself and they have to fix you. They don't track this form of transportation otherwise.