The Trace detects magical activity around underage witches and wizards, so the Ministry of Magic knows when underage magic is performed.

From the Story

Harry Potter and the Deathly Hallows

Discovered in chapter 4, The Seven Potters

The Trace cannot detect some forms of magical transport, including brooms, Thestrals and enchanted vehicles.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.