After Kawamoto failed a sobriety test, UHP Trooper Travis McIllnay who came to assist called the Beaver County attorney to discuss the incident, and following that conversation, they took Kawamoto to a Beaver hospital.
Kawamoto refused lab tests and his physician told McIllnay that he thought the man might have dementia, according to the lawsuit. When asked how old he was, Kawamoto's answers ranged from 55 to 86, and he couldn't give contact information for his family members.
The complaint states UHP Sgt. David Bairett arrived at the hospital to question the man, and it was his opinion that the driver wasn't impaired.
Kawamoto got irritated about his detention and threatened to sue UHP and McIllnay. Following the recommendation of UHP Lt. Steve Esplin, Bairett called the Beaver County Attorney, and after their talk, officers released Kawamoto, according to the complaint.
Before Kawamoto went on his way, McIllnay took him to get his front right tire replaced.
Two hours later, UHP dispatch started receiving calls about a vehicle all over the road on in the southbound lanes of I-15 in Washington County. McIllnay thought it was Kawamoto, but UHP failed to find him.
By 3:25 p.m., dispatchers in Nevada got calls about a driver going the wrong way on I-15. Five minutes later, Kawamoto crashed head-on into Moore, who was going south on the highway near Mesquite. Moore was critically injured, according to an article in the Las Vegas Review-Journal following the crash.
The officers had a duty to keep impaired drivers off the road, according to the lawsuit. Moore and his wife seek an unspecified amount in damages in the case.
Beaver County attorney Von Christiansen said Thursday morning that his office had not yet received the lawsuit and he consequently could not comment on it. UHP Cpl. Todd Johnson said Thursday that the agency could not comment on the case.
Tribune reporter Jim Dalrymple II contributed to this story.