but was it rare or was it typical, susan ferriss? think we really know that because it's so hard to get documents about incidents that happen in school and arrests. but we do know that in some jurisdictions, there are quite a few arrests of students. there's national data that we've analyzed at the center for public integrity showing that in the 2011/'12 school year there was an average of six for every 1,000 students who were referred to police from schools. we don't know what those were for. the data doesn't tell that, but when you drill down in some places to get police records or school records, you get a better idea, and sometimes there are incidents where kids are man handled by police, handcuffed, pepper sprayed, and put into the juvenile justice system. >> ifill: shaun harper, six out of 1,000 does not sound like a lot. what do the numbers tell you? >> well, the numbers tell us that at spring valley high school that there is a discipline problem. so i think that what we saw on the video was just a snapshot of a larger set of