In drug parlance, "bath salts" almost always refers to MPDV, at least where I'm from. In the US, getting something around the cops is usually a matter of selling it as 'not fit for human consumption' until it is declared illegal by federal law - the FDA is empowered only to regulate those substances marketed as food or drug. High-potency extracts of
Salvia divinorum are doing quite well in many states being sold as "incense." Plain, ordinary incense that just happens to manifest profound visionary states when consumed.
Just heard about another "attack" in (or around) Sherman, Texas this weekend. Apparently Sherman is so podunk it doesn't get outside news coverage, but it was on the local affiliate news on Monday.
A guy walked up to a couple police officers outside the county jail, they asked him what he was doing, and he proceeded to bite one of them in the arm and start gnawing on them until detained. The affiliate stringer said it was related to some police report of a new drug with the street name "Bath Salts", but you can take Bumfuck TX news affiliate reports on drugs as far as you want. Sounds like LSD to me.
For all its effects, LSD doesn't do that to people, not by itself. Psychedelics are a poor motivator of violence, I'd sooner implicate a Dramamine overdose before blaming acid for this.
I'm pretty sure meth doesn't make people violent either. Gittering, toothless, withered shells of human beings, yes, but not violent.
Extended use, particularly when coupled with sleeplessness, can cause psychosis, which can even more problematic when involving those already prone to violence. Many drugs are like alcohol in that they can lower behavioral inhibitions without being the root of the behavior itself. Other drugs are like alcohol in that they can make you forget for a while that you're a human.