In August 2011, Todd Wyatt waved his gun and badge in the window of his truck after he and Nicholas Cox took an Interstate 90 on-ramp near Post Falls.
Wyatt says Cox cut him off. Cox says Wyatt was tailgating.
The Oregonian reports the suit filed Tuesday seeks $255,000. It says the police bureau's failure to discipline Wyatt for earlier acts likely led him to think he was above the law.
Wyatt has been demoted to lieutenant, partly due to the off-duty confrontation. He was acquitted of a weapons charge in Idaho.
Wyatt's attorney said his client looks forward to an airing of the facts.
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