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. The video - posted on YouTube - was shot Friday as police moved in on more than a dozen tents erected on campus and arrested 10 people, nine of them students. (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. The video - posted on YouTube - was shot Friday as police moved in on more than a dozen tents erected on campus and arrested 10 people, nine of them students. (AP Photo/Thomas K. Fowler)