The recording of the arrest of Lawson and Franklin -- who were picked up for allegedly assaulting and robbing a man a short time earlier -- shows the suspects being helped from the ground and into the patrol car of Officer Brad Richardson.
The officer's uniform microphone also records Richardson telling the suspects, "Yeah, I'm going to make stuff up."
The Seattle Police Department called Richardson's comment "banter" and the officer was exonerated of any wrongdoing after a use of force review was conducted, along with an investigation by the Seattle Police Department's Office of Professional Accountability.
"Clearly if the officer had made stuff up he would have been in hot water," Sgt. Sean Whitcomb of the Seattle Police Department told ABCNews.com.
Lawson and Richardson said the dash cam did not record crucial moments of the arrest that they said left them with facial bruises and swelling. They claimed they were manhandled and kicked in the face by Richardson, while the officer maintained that he only kicked Lawson in the chest to make him comply with an order to get on the ground.
"I don't know who was recording what," Whitcomb told ABCNews.com. "Officers should record, [but] it's not a violation not to."