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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, according to BBC.

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.