and what's to stop enemies from sending something nasty via owl post? I mean, if you can enchant a piece of paper to scream and then burst into flames, you could enchant (one assumes) an object to explode, to release a noxious gas, etc. Or! Why not just owl a port key to wanted to criminals? Open the letter and bam, you're in a holding cell in the MoM.
The question that's been bothering me is: why, if they can instantaneously trace the use of magic by students (and the identity of said student), can't they also track the casting of Unforgivables, and the identity of the caster? All those Death Eaters who claimed to be controlled by the Imperious wouldn't have a leg to stand on. (Which leads to the next question: How fucking stupid is the Ministry if they just accept someone's word, "Oh, I wasn't *really* a Death Eater, I was being controlled by a curse." What's the use of having a truth serum if they never use it?)
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The question that's been bothering me is: why, if they can instantaneously trace the use of magic by students (and the identity of said student), can't they also track the casting of Unforgivables, and the identity of the caster? All those Death Eaters who claimed to be controlled by the Imperious wouldn't have a leg to stand on. (Which leads to the next question: How fucking stupid is the Ministry if they just accept someone's word, "Oh, I wasn't *really* a Death Eater, I was being controlled by a curse." What's the use of having a truth serum if they never use it?)