BANNED for the use of magic outside Hogwarts, decreed by The Ministry of Magic 'Reasonable Restriction of Underage Sorcery since 1875.'

Paragraph C of the clause states that it is a crime to knowingly perform magic in a Muggle-inhabited area and in the presence of a Muggle. However, Clause 7 also states that magic can be used in front of Muggles in exceptional circumstances, including situations when the life of the witch or wizard is threatened, or the lives of other witches, wizards and Muggles are threatened