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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.
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.