Atlanta police released the surveillance camera video. Witherspoon was arrested last week after allegedly interfering with her husband's arrest. She was charged with disorderly conduct.
Her husband, Hollywood agent Jim Toth, was arrested and accused of driving under the influence of alcohol. Police say their car was swerving across lanes when the officer pulled them over, and asked Toth to take a sobriety test.
Before the field sobriety test began, Witherspoon got out of the car. When she was told to return to it, she did, according to the report. But then she got out a second time, and was warned she'd be arrested if she left the car again.
As the test continued, "Mrs. Witherspoon began to hang out the window and say that she did not believe that I was a real police officer. I told Mrs. Witherspoon to sit on her butt and be quiet," Trooper First Class J. Pyland wrote.
After her arrest, Witherspoon apologized, saying she was "deeply embarrassed" by the incident.