Why Apple is able to remove security tethers from demo devices

Earlier this morning, I posted about Apple removing security tethers from devices in the Apple Stores.

One question I had was how this would impact shoplifting, how Apple was able to keep an eye on things.

From this 9to5mac post by Ben Lovejoy:

A source tells us that the current special OS images on demo devices include a software ‘kill switch’ which disables them when they go out of range of the store Wi-Fi. This means that Apple no longer has to use Find My iPhone to disable them manually.

Read the rest. Pretty interesting.