As strong as your selection policy might be, having a Board-approved reconsideration policy as part of it will help when any material currently in your collection is called into question. Good reconsideration of library materials procedures establish the framework for responding to a complaint and provides for a review process with appropriate actions while defending the principles of freedom of information, the freedom to read, and the professional responsibility and integrity of the teacher librarians involved in the selection process. See the ALA Selection Policy Toolkit for more information and forms concerning formal reconsideration.
Below are some resources that may help. *PRO TIP: Download PDF sample forms and open with Word to customize.
"Persons who are concerned about the appropriateness of library resources or are unsatisfied with the response from an informal discussion about a title may choose to make a formal request for reconsideration of the work in question. A formal reconsideration request is a written document that is usually reviewed by an assigned library staff member or committee. In order to provide a standard method for receiving patron input, every library should have a written process for handling formal complaints as part of the reconsideration policy. This will serve as a guideline when reviewing, evaluating, and processing formal reconsideration requests. Adding timeline requirements to the reconsideration process ensures that complainants concerns will be addressed in a timely fashion. Timelines should be determined based on the needs of your institution."
from the American Library Association's (ALA) Formal Reconsideration webpage
(from the American Library Association's Sample Reconsideration Form webpage)