(KRON) — A suspected DUI driver is believed to be responsible for a chain reaction crash that resulted in the injury of a California Highway Patrol officer, according to the CHP Contra Costa station. 

Around 8:22 p.m., an officer with CHP Contra Costa was conducting a stop on a Chevrolet on the right shoulder of southbound State Route 242, just south of State Route 4. A Mercedes heading south veered off the road and collided with the back of the parked Chevrolet, CHP said.

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The force of the crash was so strong that it caused the Chevrolet to strike the CHP officer. The officer was taken to a local hospital and treated for her injuries. CHP says she will make a full recovery. The driver of the Mercedes was not injured in the crash, but they were arrested on suspicion of driving under the influence of drugs.