The beginning of a zombie apocalypse? (News)

I'm very sure it's caused by drug abuse as well. There are no such things as zombies (at least the ones we see on TV). I believe he was really high on drugs and that the poor guy he was attacking was as well. The reason I think so? Both of them were naked.
I read that some types of drugs can cause the body to overheat and the drug users cannot stand having their clothes on. Either way, any kind of mind-altering drugs do just that, alter the mind.