"Bath Salts" is not a "thing". "Bath salts" is how "research chemicals" (read: drugs) are imported to the United States and sold under the radar of the FDA and DEA.
These things are sold as: lady bug attractant, plant food, or bath salts.
None of these are actually the intended use, unless you think that head shops are now having crossover with bath and body works.
Here is an excellent [but very depressing] story about how some "lady bug attractant" devastated a town:
As was found via a reddit user, McAfee posted as "Stuffmonger" on a drug forum called http://www.bluelight.ru about his use ( with pictures and detials) of MDPV.
This is often sold as "bath salts" or "incense" but is illgal and as you can see from the stuffmonger thread not user super user friendly unless your a chemist.
Unfortunately I suspect suing one of these companies would not be worth the trouble. I can't imagine they keep any amount of assets anywhere that they could be seized.
It says the kid Sanders "wasn't prone to depression" but was "in a drug program for marijuana abuse, actively attending group meetings and undergoing frequent drug tests." Eh.
The release of dopamine is symbolized by the water being released from the tap. When the water goes down the drain it is said to "reuptake". So bath salts, or MDPV, essentially combine the effects of cocaine and meth into one -- according to the PBS article, anyway.
Also, here's a quick summary of what the drug does in GIF format: http://i.imgur.com/P4csH.gif