At 3:05 a.m., Idaho State Police pulled over a 2011 Infinity G37 on the interstate at milepost 84, near Mountain Home, for a traffic violation.
The driver was identified as Robert Knowles, 47, of Bonney Lake, Wash. Sarah Miller, 21, also of Bonney Lake, was a passenger in the vehicle.
Idaho State Police was assisted by the Mountain Home Police Department and the Elmore County Sheriff's Office, which utilized a drug detection canine.
Approximately 4.5 ounces of cocaine, over 1.5 ounces of methamphetamine, small quantities of heroin and marijuana, and approximately $9,400 in cash were found and seized.
Both individuals were incarcerated in the Elmore County jail on multiple charges, including drug trafficking.
The car was impounded and is potentially subject to seizure by the Idaho State Police.