(MCT) — CHICAGO — The Chicago Police Department doesn’t pursue officers accused of excessive force as aggressively as other large departments, an expert testified Wednesday at a federal trial over the beating of a female bartender by an off-duty officer.

Dr. Steven Whitman, an epidemiologist at Mount Sinai Hospital, told the jury that the city of Chicago sustained just 2.7 percent of the excessive-force complaints filed against officers from 1999 through 2004, well below the 6 percent national average in 2002 for departments with at least 1,000 officers.