A naked man who gnawed on the face of a homeless drifter was under the influence of marijuana, and not the synthetic drug bath salts, it has been revealed.

Rudy Eugene was shot dead as he chewed on Ronald Poppo's face during the attack on Miami's MacArthur Causeway last month.

It had been widely believed Eugene had been under the influence of bath salts at the time of the bloody attack.

But a full toxicology report released by the Miami Dade medical examiner on Wednesday has confirmed this was not the case.

Scroll down to view the events of Miami's 'naked cannibal attack' in chronological pictures.
WARNING: Contains graphic images of death and injuries some readers may find disturbing.

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The statement, reported by NBC Miami, said: "The department's toxicology laboratory has identified the active components of marijuana.

"The laboratory has tested for but not detected any other street drugs, alcohol or prescription drugs...This includes cocaine, LSD, amphetamines (Extasy, Meth and others), phencyclidine (PCP or Angel Dust), heroin, oxycodone, Xanax, synthetic marijuana (Spice), and many other similar compounds."

A second forensic toxicology lab also confirmed the absence of bath salts.

"Within the limits of current technology by both laboratories," stated the press release from Medical Examiner Dr. Bruce Hyma, "marijuana is the only drug identified in the body of Mr. Rudy Eugene."

Armando Aguilar, president of the Miami Fraternal Order of Police, had speculated Eugene may have been on bath salts, adding users “go completely insane and become very violent.”

The drug, which is banned in many states, can cause severe agitation, rapid heart rate, high blood pressure, paranoia and symptoms of psychosis, including hallucinations and delusions.

It can also lead to overheating of the body, which is why so many users remove their clothing.

Poppo was rushed to Jackson Memorial Hospital in a critical condition, but allowed two pictures of himself to be released.

The images reveal one of his eyes was lost to the attack while the other is covered by gauze. Poppo’s nose is missing and his forehead is a mass of scabs.

Doctors told the press approximately 50 per cent of his face is missing, that the patient remembers the attack, understands he is in hospital and is aware of the media coverage.

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  • The first police officers on the scene rush towards Rudy Eugene and Ronald Poppo following the attack on Miami's MacArthur Causeway on May 26

  • A pair of naked legs can be seen in the images, which were captured by the Miami Herald's surveillance camera

  • Officers approach the two men

  • It is unknown if Rudy Eugene had been shot dead at this point

  • An officer vaults over the wall as he races towards the bloody scene

  • Crowds gather at the horrific scene

  • A City of Miami police officer stands watch near the scene

  • This is believed to be one of the first pictures taken after Rudy Eugene was shot dead by police. A seriously injured Ronald Poppo lies beside him

  • An undated mugshot of Rudy Eugene

  • An undated mugshot of Ronald Poppo

  • A pixellated image of Ronald Poppo's injuries upon his arrival to Miami's Jackson Memorial Hospital

  • Conscious and speaking, Ronald Poppo allowed this photo of himself to be released by the hospital

  • Ronald Poppo holds onto the hands of two Jackson Memorial Hospital staff

  • Gloria Allred, Yovonka Bryant

    Yovanka Bryant,left, and her lawyer, Gloria Allred, discuss a recent attack on a homeless man by Brant's boyfriend Rudy Eugene, during a news conference, Wednesday, June 6, 2012 in Miami. Bryant said she last heard from Eugene, the day before he chewed off the face of a homeless man alongside a Miami highway. A police officer shot and killed Eugene. The homeless man remains hospitalized. (AP Photo/J Pat Carter)

  • Gloria Allred, Yovonka Bryant

    Yovanka Bryant, right, and her lawyer, Gloria Allred, show a photo of Bryant and her boyfriend Rudy Eugene, during a news conference, Wednesday, June 6, 2012 in Miami. Bryant said she last heard from Eugene the day before he chewed off the face of a homeless man alongside a Miami highway. A police officer shot and killed Eugene. The homeless man remains hospitalized. (AP Photo/J Pat Carter)

  • Former 'bath salts' addict Freddy Sharp told CNN about his experience of the drug Rudy Eugene is believed to have been under the influence off when he attacked Ronald Poppo

  • Westbound traffic on the MacArthur Causeway, approaching the Northeast 13th Street ramp in Miami, is backed up Saturday May 26, 2012, after a police officer fatally shot a naked man on the ramp who was chewing on the face of another naked man. The victim remained hospitalized Monday. (AP Photo/The Miami Herald, Marsha Halper) MAGS OUT

  • A Google Maps image of where the attack occurred