I think its in the delivery system.  If each item was in a rack...that if
the rack bar was released to take a product out, then first you would know
if it was accessed, second using an IR beam you know that it was removed and
third because you know what rack was accessed you know what product was
removed.

It has mechanics associated but would not allow the user to put it back
empty, sort of a one way delivery system.  If removed by accident, call the
desk and let them know so you wouldnt be charged.  Use a network interface
to send the data to the front desk.

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