The shooting sparked an internal probe of the narcotics unit after drug evidence was found in the trunk of Cowley's patrol car, rather than the department's evidence room.
Cowley's attorney, Lindsay Jarvis, has argued her client is the "fall guy" for the narcotics unit and the victim of no training on how to be an undercover detective.
The probe revealed multiple violations by detectives in the Neighborhood Narcotics Unit, including that members of the unit had mishandled evidence, inappropriately used GPS tracking devices, kept trophies, or removed change and other property from suspect's vehicles.
Six of the officers have been disciplined; a seventh officer, Kevin Salmon, remains on paid leave in connection with the Willard shooting.
Cowley and former Lt. John Coyle who headed the narcotics unit and was demoted after the probe are both appealing their discipline to the civil service commission. Coyle's hearing was in January.
The three-member commission has not yet decided whether to reinstate Coyle to his former rank of lieutenant.
Meanwhile, the Salt Lake County District Attorney's Office deemed the shooting of Willard was not legally justified. No criminal charges have been filed against Cowley or Salmon in connection with the shooting.