Theory on Zombies

i have comne up with a thory on zombies that is entirely possible. all of the following situations are hypotheticle. "what if the goverment took all substances containing methemphedamine in them? and what if the few items that arnt are so diluted of meth that meth addicts cook up the most hazardous ways to get meth? what if they make chemicles so dangerous their brains are fried complelty! their cerebreal cortex would be fried, all thats left being the brain stem. all thats left in their minds is the absolute need for meth! they become animal like killing in packs as deadly brain dead zombies? i pose this question andy, what if?