A Miami man shot dead by police as he chewed the face off a homeless person only had marijuana in his system, a coroner has found.
A police union official speculated at the time that Rudy Eugene, 31, had been under the influence of a category of street drugs known as " bath salts".
After stripping naked, Eugene attacked Ronald Poppo on a causeway in May.
Toxicology results found no alcohol, prescription drugs or adulterants often mixed with street drugs in his body.
An outside forensic toxicology lab also looked at the results and came up negative for bath salts, synthetic marijuana and LSD.
"Within the limits of current technology by both laboratories, marijuana is the only drug identified in the body of Mr Rudy Eugene," the Miami medical examiner's office said in a statement.
Eugene was shot and killed by a police officer after he ignored warnings to stop eating Mr Poppo's face.
Armando Aguilar, of Miami's Fraternal Order of Police, told the Associated Press at the time that Mr Poppo "had his face eaten down to his goatee".
Mr Aguilar told a CNN affiliate he believed the suspect could have taken a type of drug known as bath salts, citing four past overdoses in the Miami area where people had also removed their clothes and gone berserk.
Supernatural
Eugene's family told the Associated Press that he was not violent and did not drink or do drugs other than marijuana.
"There's no answer for it, not really," Eugene's younger brother, Marckenson Charles, said.
"Anybody who knew him knows this wasn't the person we knew him to be. Whatever triggered him, there is no answer for this."
