In an era of heightened censorship and book challenges, school librarians are increasingly called to make principled collection development decisions that balance intellectual freedom, professional ethics, and community expectations. This session presents findings from a recent doctoral dissertation exploring how school librarians apply ALA's Core Values and Code of Ethics to guide their work in these complex circumstances. Through qualitative interviews and circulation data, the research illuminates how values such as access and diversity shape librarians' responses to censorship pressures.