Independent testing of handheld radar guns used by state police has determined the devices work properly, according to a report released Friday.

The study, by the University of Pittsburgh School of Engineering, contradicted claims the Decatur Genesis guns were producing readings that could have led to unwarranted speeding tickets.

"The bottom line is that our radar units are accurate, and if you receive a citation based on a radar reading, you can be sure that it is an accurate reading," state police spokesman Jack Lewis said.

The study was prompted by an anonymous complaint lodged earlier this year with the Office of Inspector General, according to state police. The department was responding to reports that stationary objects were measured at high speeds.