It definately makes people far more aggressive if they have a tendency to be like that anyways, but Iv only ever heard/read of 1 person eating another persons face off, usually thats reserved for ones own face
Id NOT recommend it even just to try tho, it's a dirty drug, but if you want to look it up it goes by a few other names; Mephedrone, Bubble, Meow Meow, Charge+ (I think is Mephedrone) and so on.
Id say the cannible case (if anything to do with it) is a one off tho, it looks like its being spun for political reasons as the cause tho.