A handful of libraries in the area are allowing self-checkout for established patrons. This is limited to books for the time being, as items like DVDs are locked in plexiglass cases and must still be handled by a library staff member before patrons leave the building. Other high-value items have similar deterrents.
A simple solution would be to let the patrons dismantle any security precautions themselves during the self-checkout process, but this does not defend against dishonest patrons, and of course basically enables casual thefts.
The best idea would be to just require library personnel for checkout, but allowing patrons to self-checkout frees up the staff to do their countless other responsibilities.
How could the library maintain the security devices and reap their benefits, while allowing patrons this autonomy?