Police are asking for help in the investigation of a University of Northern Colorado student who disappeared Saturday and is presumed dead. Jason Clausen, who is being held in connection to twenty-year-old Lacy Miller's disappearance, has been known to drive around in his white Ford Expedition with red and blue emergency lights and a bail bondsman's badge. Police released photos of the car and a flat-bed trailer that may have been used to transport the body, and are hoping someone will come forward who saw the car sometime between Saturday and Monday. Police spokeswoman Rita Davis says the body still hasn't been found. Police now acknowledge they're investigating the possibility that Miller may have been pulled over by someone posing as an officer. Investigators also think a police impersonator may have also stopped or tried to stop other women recently.