Re: Stun gun?
There are magnetics-based theft-detection widgets. At a record library I worked at we had a system by 3M, consisting of strips stuck on the items, a detector gate and activating/deactivating units. Giving items out you passed them over one end of the unit (which had some kind of sensor, triggering a *thunk* sound), getting them returned you passed them over the other end. The detector gate had a switch mat; if you didn't step on it leaving with a still-activated item, it didn't beep. But that was 25 years ago.
Biting the hand that feeds IT
