Georgia State Patrol said on Friday it would release the video after a copy of the footage was leaked by celebrity website TMZ overnight.
The video in question was captured by the dashboard camera of the state trooper who confronted Oscar-winning Walk the Line star and her Hollywood agent husband Jim Toth in the early hours of April 19 in Atlanta.
After stopping the couple's vehicle, the no-nonsense trooper administers a field sobriety test to Toth. In the video, the actress is seen repeatedly ignoring the officer's directive to remain in their vehicle and engages with him multiple times.
At one point, she declares "Do you know my name?" before adding "You're about to find out who I am."
- Reese Witherspoon apologizes for comments to police
After the incident, Witherspoon issued a public apology for her behaviour.
On Thursday, she appeared on ABC-TV's Good Morning America to apologize again and acknowledged that after having had too much to drink that night, she had said "all kinds of crazy things."
Also on Friday, a lawyer for the actress confirmed Witherspoon has pleaded no contest to the disorderly conduct charge and paid a $100 US fine.
Canadian singer Michael Bublé, who sings a duet with Witherspoon on his latest album To Be Loved, is among those defending the actress. Earlier this week, at an event in Los Angeles, Bublé said he "adores" Witherspoon and praised her response after the arrest.
"Everyone makes mistakes," he told ET Canada. "It's just a matter of, really, how you come back from them."
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