In this image made from video, a police officer uses pepper spray as he walks down a line of Occupy demonstrators sitting on the ground at the University of California, Davis on Friday, Nov. 18, 2011. (AP Photo/Thomas K. Fowler)

Photo by: Thomas K. Fowler

In this image made from video, a police officer uses pepper spray as he walks down a line of Occupy demonstrators sitting on the ground at the University of California, Davis on Friday, Nov. 18, 2011. (AP Photo/Thomas K. Fowler)