On Wednesday, officers with the Sault Ste. Marie Police Service's patrol services unit responded to the Algoma Treatment and Remand Centre after a 911 call.
Around 6:30 p.m., officers responded to the scene after a complaint of an assault.
Police say that their investigation revealed that the accused spat in the face of the victim, who was taken to hospital as a precaution.
John Nemeth, 59, was charged with assault of a peace officer.
None of the allegations have been tested in court and Nemeth is considered innocent unless proven guilty.