I've gotten a lot of questions about how librarians can be held responsible for teachers who decide to copy graphics, so I found this great site: http://cfbstaff.cfbisd.edu/librarybush/teacherinfo/copyright.html. According to this site, librarians can be held accountable in two ways. One way is that they are "aiding" a teacher by lending them the material (Salemo). They also are involved due to "chain of command" (Salemo). There are fines involved as well, although I'm not sure how they decide who was involved. I'll have to look for more information about how they determine a librarian is partly responsible, and I'll let you know what I find out!
Salemo, Chris. "Info. for Librarians: Critical Issues on Federal Copyright Legislation". 8 Oct. 2008 <http://cfbstaff.cfbisd.edu/librarybush/teacherinfo/copyright.html>.