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We know Umbridge used the blood quill on both Harry and Lee Jordan in OOTP but later in the series (DH?) it is implied that their use is illegal or at least strictly regulated, so which is more...

Okay, so we know that in canon the young pre-hogwarts children are capable of doing magic when under duress and are also sometimes able to manage some early control (such as Lily in DH) but how far...