Bath Salt Zombies is a 2013 American horror comedy directed by Dustin Mills, written by Mills and Clint Weller, and starring Josh Eal, Ethan Holey, Jackie McKown, Dave Parker, and Brandon Salkil. It is about zombie attacks brought on by concentrated bath salts.
Concentrated bath salts are lethal to the zombies
The article stated that the zombie attacks were brought on by concentrated bath salts. It did not state whether the zombies were attacking to eliminate bath salts that may affect them or that the bath salts made them into zombie therefore to make the statement of it begin lethal would be incorrect