The Technical Challenge Slide 17 of 38 The Technical Challenge Filtering software is a tool - it can not address all problems related to Internet use in the library. The scope of the Internet makes it impossible to be able to find every possible objectionable site.
Some filters make it difficult for librarians to customize stop lists or unblock the filter.
Most software providers do not release their Stop Lists, making it difficult to determine what is being blocked. Some Stop Lists appear to have biased blocking policies.