Authorities are still searching for a Bettendorf man who’s been missing for four days. 24-year-old Bryce Allen Quinn may be disoriented due to a medical condition that requires medication. He was last seen at his home on Thursday. His car was found last Friday, parked near the entrance to a park in Clinton County. The car was locked and the keys weren’t in it. Steve Brauer, a captain in the Bettendorf police department, says the disappearance has raised lots of concerns. Brauer says search and rescue dogs have not located a trace of Quinn in the area where his car was found.