Attack Dogs used on a High School Walkout in MD, Four Students Charged With 'Thought Crimes' Northwestern High School in Hyattsville, Maryland. March 1, 2012.
Addendum: nobody was attacked by the dogs. The dogs were present and the kids found them threatening, but nobody was attacked. The title is inflammatory and misleading, and I'm sorry I went with it. I reproduced the YouTube title but wish I had made up another one.