Christopher Mark Topham, who worked as a UHP trooper from 1990 to 2003, faces eight first-degree felony counts of aggravated robbery and four misdemeanor counts of impersonating an officer, court records show.

Topham allegedly posed as an officer on May 23 and stopped a driver on Interstate 70 near Richfield. He then allegedly stole money from the driver after asking to see his wallet and registration.

On June 28, another driver complained that Topham stopped him on I-70 and stole money from his wallet and the wallet of a passenger in his car, the sheriff's office reported.

The last complaint occurred June 30 when Topham allegedly stopped five men in a car and stole $9,000 from them.

They told investigators Topham had a gun and was wearing police clothing.

Six of the nine known victims were able to identify Topham from a photo lineup, the sheriff's office reported.

Topham remained in the Sevier County jail Monday night. Bail was set at $304,070, court documents indicate; his attorney has requested a reduction, while prosecutors want to see bail denied altogether. A judge will review the amount in a future hearing.

UHP spokesman Jeff Nigbur said Topham was on the force for nearly 13 years and was never a disciplinary problem

"He was a good trooper," Nigbur said.