According to CNN:
The naked Florida man who chewed off the face of another man last month in a zombie-like cannibal attack used marijuana but not “bath salts” as police had suspected, authorities said Wednesday.
Rudy Eugene, 31, was killed by a police officer after Eugene's 18-minute attack on a homeless man. His body didn't show “any other street drugs, alcohol or prescription drugs, or any adulterants found in street drugs,” according to the Miami-Dade County Medical Examiner Department.
“The department has also sought the assistance of an outside forensic toxicology reference laboratory, which has confirmed the absence of 'bath salts,' synthetic marijuana and LSD,” the statement said.
There you have it. Either he smoked some black magic weed, or he was bored with his diet and already thinking about dipping his toe into the cannibalism pool, or — and this is a big OR — the Zombie Apocalypse IS ACTUALLY A THING! Hide yo kids, hide yo wife.