The investigation into whether U.S. Park Police used excessive force when arresting dancing protesters at the Jefferson Memorial is over.
Video of the May 2011 arrests spawned controversy and launched an investigation into whether officers body-slammed and choked protesters.
The officers accused of abusing their power have been cleared of any wrongdoing.
The Park Police Internal Affairs unit found no evidence of police brutality.
"Our internal affairs unit found the level of force used was in compliance with established legal precedence and the department's use of force policy," Sgt. David Schlosser told WTOP.
Investigators also stress that at no time did anyone request medical attention.
The agency has, nevertheless, revamped how its handle demonstrations at the Jefferson.
One week after the controversial arrests, dancing protesters returned to the Jefferson.
Officers cleared the monument without arrests.