I'm wondering if this is possible. If this is an issue that has happened a few times already what do the police reports say about those incidents?

What drugs were involved? What time of day? Who were involved? Are these people somehow involved (same race, type of job, demographic etc).

I am believing that if people can look up other incidents that are similar (using jaws as weapons, extreme violence etc) there you might be able to find more clues on what is going on and whether or not it is simply the case of od'ing on "bath salts"...