FBI test results show no evidence that Austin Harrouff, the 19-year-old authorities say killed two people in their Martin County home and was found biting one of their faces, had either bath salts or flakka in his system at the time of the fatal attacks. The report was one of dozens on the case released Wednesday by the State Attorney’s Office.

Dozens of interviews and reports and hundreds of photos from the scene of the attacks detail the gruesome and bloody aftermath of the fatal stabbings of John Stevens III, 59, and Michelle Mishcon, 53. Authorities say Harrouff killed the couple Aug. 15 at their Southeast Kokomo Lane home, just north of the Jupiter border.

MORE ONLINE: Read The Post’s complete coverage of the fatal stabbings of John Stevens and Michelle Mishcon.

Nellie King, one of Harrouff’s two attorneys, said Harrouff had several drugs in his system that were "medically introduced to him" at St. Mary’s Medical Center in West Palm Beach, where he went for treatment of his injuries after the attacks. But as defense attorneys expected, there were no designer drugs found in the 19-year-old.

Use of synthetic drugs such as bath salts and flakka has been linked to paranoia, nightmare-like visions and bouts of super-human strength.

Harrouff and his attorneys pleaded not guilty to two counts of first-degree murder, attempted first-degree murder and burglary last week.

King, who is based in West Palm Beach, said that although investigators first believed Harrouff may have been on flakka, they should rely on evidence "instead of speculation with no basis in fact."

"We know this information will be of no comfort to the victims’ families and friends, but, as painful as this process is, it is critical for everyone involved to examine the facts and avoid jumping to conclusions," King said in a prepared statement.

The Federal Bureau of Investigation was asked to do a more thorough test for designer drugs soon after the attacks after initial tests checking for common drugs like cocaine, marijuana and heroin came back negative, according to the Martin County Sheriff’s Office. Though Harrouff told deputies on the scene he had no drugs in his system and to "test him," court documents show he told paramedics that he smoked marijuana and had drank alcohol.

The FBI’s analysis did find trace amounts of alcohol and cannabis in Harrouff. The source of the alcohol could not be identified. It could have come from swallowing chemicals in the garage at the home where the attack took place, King said.

Harrouff, a Suncoast High graduate and a Florida State University student, remained in the hospital for weeks after the attack because of damage to his esophagus and internal organs. He was finally arrested Oct. 3 by sheriff’s deputies.

King said Harrouff, a Jupiter resident, "is struggling with severe mental illness and the judicial process will bear all of this out in due time." She did not say if her client has been diagnosed with a specific mental illness.

Harrouff’s father, Wade, told TV personality Dr. Phil McGraw in September that he feared his son suffered from an undiagnosed mental-health issue such as schizophrenia. which the elder Harrouff said runs in his family.

In a new complete 911 call from the night of the attacks, Harrouff’s mother told a dispatcher her son took off from a restaurant with his father and that she was concerned for his safety.

"He’s acting a little strange. … It seems like he’s a little delusional," Mina Harrouff said. "Or he’s acting like schizophrenia."

AUDIO: Listen to the 911 call Austin Harrouff’s mother made to Jupiter police.

"Does he have a history of that or anything?" the dispatcher asked.

"No, this is recent change that we’re noticing," she replied.

When Harrouff was taken to St. Mary’s after they were able to separate him from Stevens’ body, deputies say Harrouff told them he ate something bad. When they asked what, Harrouff replied, "humans."

As Harrouff was taken to the hospital Aug 15, investigators began documenting the violent scene. Bloody footprints and hand prints are found throughout the garage area where family and friends said Stevens and Mishcon liked to relax. A switchblade knife, a pair of blue scissors and a wine bottle-opener were found dripping with blood.

The medical examiner’s report on Stevens said the 59-year-old grandfather was sliced 14 times, including four stab wounds to chest that penetrated to his lungs.

According to a forensic odontology report, there appeared to be two bite marks on Stevens’ body. His left earlobe appeared to be severed from a bite, and there were bite mark on his left temple as well, but the doctor could not determine without casts of Harrouff’s teeth to match the area.

Sheriff’s investigators asked the doctor to also look at a third mark on Stevens’ chest that may have been from a bite. While investigators determined it appeared to be a knife wound, the area "may have been ‘sucked’ on" but showed no defined bite marks, according to the report.

Mishcon was stabbed several times in the back, as well as having her jawbone, nose and ribs fractured, according to the medical examiner’s report.

When investigators interviewed Jeff Fisher, the neighbor who tried to intervene in the fatal attacks, he said he only saw Harrouff attacking Mishcon. He said he did not see Stevens in the area at the time.

When Fisher tried to stop Harrouff, he said he punched him once in the face, which knocked Harrouff to the ground. That’s when Fisher realized he was bleeding and had been stabbed. As he ran away to his home, he said all he heard was Harrouff talking, but had no idea what he was saying.

After Fisher called 911, he said he had to lie down on the tile in his home because he got dizzy.

"Whether it was reality or my own figment of my imagination," Fisher said of the attacks, according to an interview with investigators.

Harrouff will remain in the medical wing of the Martin County Jail until his next court date in January.