Investigators with the Georgia State Patrol's Troop B Specialized Collision Reconstruction Team (SCRT) spent the day Monday at the scene of fatal collision on Highway 15 outside of Watkinsville.
GSP issued a press release at the end of the day, saying only that investigators had determined what factors did not cause the wreck.
They confirmed there was no sign of alcohol or drug use by the drivers of either car involved.
"There is no indication of any substance and no person involved had any signs of impairment, nor were there any signs of any impairing substances located at the scene or in any of the vehicles involved," the release stated.
They also said inspections of diagnostic equipment from both vehicles showed neither driver was speeding.
"Both vehicles were equipped with a Sensing Diagnostic Module (SDM). After an analysis of the data received from each vehicle, there is no indication of any speeding violation noted within the data recovered," the statement read.