Kennewick police say the driver who likely caused a major head on collision appears to have fallen asleep behind the wheel. New information has come to light from police, who now say the suspect driver smelled heavily of pot.

Shortly after 11am Wednesday, a Ford Taurus driven by John K. Cereatti of Kennewick crossed the center line and slammed head on into a Scion driven by Mary Louse Abeyta of Prosser.

She sustained unspecified injuries, as did Cereatti. However, they were not believed to be life-threatening.

Police continue to investigate as to why Cereatti apparently fell asleep while driving, but police say he is under investigation for driving while impaired.

UPDATE-  Kennewick police said Thursday Cereatti is being investigated for DUI, and smelled heavily of pot at the scene. This apparently caused his drowsiness and inability to operate his car in a safe manner. A search warrant was issued for blood and toxicology tests, which are still being conducted.