Michael Chip McCollum, 33, of Gisela, faces a prison term of up to 3.75 years for driving under the influence of drugs while his license was suspended, and use of marijuana.
Gila County Attorney Daisy Flores said it took a jury of eight less than an hour to find McCollum guilty.
According to the prosecutor, Deputy County Attorney John T. Franklin, McCollum admitted to smoking marijuana after being pulled over for speeding by Department of Public Safety Officer Vern Havens.
"His license had been suspended because of a previous DUI charge," Franklin said.
Franklin praised DPS Officer Havens and DPS Sgt. Richard Alvarez for their work on the case.
McCollum is scheduled to be sentenced in Payson on July 19.