Ms Catherine Fahy:

It is very difficult to sell materials from the library because they are stamped with ownership marks. That renders them virtually unsaleable, which is a significant disincentive to potential thieves. We also have quite strict regulations in our reading rooms. We issue rare materials only under close supervision and in designated areas we have electronic tagging devices on our book collections, which is also a deterrent to potential thieves. It is a problem for libraries worldwide.