“Mephadrone is naturallly found in many kinds of bath salts”
Sorry, no, this is a synthetic ampetamine analog. Real bath salts are actually salts with a bit of perfume in them, and sometimes oil.
According to Wikipedia, it does occur in some bath salts. It’s just that some meth head, looking for a high and was short his drug of choice, tried it out and it worked.
They do that.
Drug addicts will try just about anything when they need their high and their dealer isn’t selling to them.