The former Suffolk district attorney and a top aide will not be getting a new trial.
A judge has refused to overturn the convictions of Thomas Spota and Christopher McPartland.
They were found guilty last year of orchestrating a cover-up over the beating of Christopher Loeb by then-county police chief James Burke.
Spota and McPartland requested a new trial, claiming a witness committed perjury, but the judge called their argument "meritless, speculative, and implausible."
Spota and McPartland each face up to 20 years in prison, but would most likely get less under federal sentencing guidelines.
A sentencing date has not been set.