LITTLE ROCK, Ark. – A man police say shot himself in the head while his hands were cuffed behind him in the back of an Arkansas patrol car tested positive for methamphetamine, anti-anxiety medication and other drugs, according to an autopsy report released Monday that listed his death as a suicide.

The state crime lab report said the muzzle of a handgun that Chavis Carter apparently concealed from arresting officers was placed against his right temple when it was fired. The report, signed by three medical examiners, included a drug analysis showing Carter’s urine and blood indicated methamphetamine and other drug use.

The report, released to news organizations under a Freedom of Information Act request, said Carter’s blood also tested positive for at least trace amounts of the anti-anxiety medication diazepam and the painkiller oxycodone. His urine test also returned a positive result for marijuana.

The report said Carter’s death was ruled a suicide based on autopsy findings and investigative conclusions from the Jonesboro Police Department, which has faced questions from Carter’s family and community members about the circumstances surrounding the July 28 shooting.

“He was cuffed and placed into a police car, where apparently he produced a weapon, and despite being handcuffed, shot himself in the head,” the report said.

Benjamin Irwin, a Memphis, Tenn., lawyer representing Carter’s family, declined to comment on the specifics of the toxicology report, calling instead for police to release details of any gunpowder residue or other such tests. “If those tests were taken … what were the results?” Irwin asked.

Police have said officers frisked Carter, 21, twice after a traffic stop without finding a gun before he was fatally shot, but the department’s internal investigation continues.

The FBI also is monitoring the case and the local branch of the NAACP has called for a thorough investigation into the death of Carter, who was black. Two other men who were in a truck with him during the stop and the two officers who were on the scene are white, according to police.

The autopsy report comes days after police released dashboard camera video recorded the night Carter was shotk. Part of the video showed Carter being patted down. It ended before officers found Carter slumped over and bleeding in the back of a patrol car as was described in a police report. Police later released additional video they said was recorded after Carter was found.

Neither included the moment they say Carter shot himself.