(KMOV)-A St. Clair County judge threw out a lawsuit Thursday that was filed against IIlinois state trooper, Matt Mitchell.
A couple from Fayetteville were injured in the crash and filed a suit against Mitchell.
A judge ruled Mitchell had immunity against the suit because of his job.
Mitchell was driving his patrol car more than 100 miles per hour on Interstate 64 when the car went out of control, and crossed into the median into oncoming traffic.
Two sisters, Kelli and Jessica Uhl of Collinsville died in the collision.
Mitchell has pleaded not guilty to reckless homicide charges.