A company with several hundred employees has several office rooms used as kitchens - they are equipped with tables, microwaves, sinks and fridges. Employees leave their food in the fridges and sometimes food just disappears. This happens so often it just can't be accidental.

Short of installing a huge surveillance camera near each of the fridges what can be done to prevent these events?

A company with several hundred employees has several office rooms used as kitchens - they are equipped with tables, microwaves, sinks and fridges. Employees leave their food in the fridges and sometimes food just disappears. This happens so often it just can't be accidental.

Short of installing a huge surveillance camera ^{see note below} near each of the fridges what can be done to prevent these events?

_{Regarding camera - first, installing it takes effort (and some money), and second, it would mean people don't trust each other, and third, people just don't like being watched by cameras everywhere.}