Board Thread:Questions and Answers/@comment-25040720-20140721205638/@comment-5230978-20140728131616

It may not be directly explained, but we know very well there are concealment spells, senses and mind manipultaion spells, even large scale ones, so it's easily assumable that large magic organizations have them too. Plus, it wouldn't even be strange if informations manipulation spells exist. After all there is even a parameters manipulation spell.