My daughter told me in third grade that they weren't allowed to get books "this thick" (with a hand gesture showing a thickness of about a standard chapter book). I asked the librarian about it in disbelief and she assured me it was true because "otherwise they all want to read vampire books that are completely inappropriate."
We were able to get a special exemption because I promised to monitor the books (although she monitors well herself and doesn't want to read anything she thinks will be too upsetting).
Our challenge this year has been that she kept saying she didn't know where the higher level books were and the school saying that she did. It turns out no one had realized they were completely above her height and eye level even with the tallest ladder. The only solution has been having me go there after school to read off titles to her.