As an outsider observing the discussion, I'm puzzled by the attempts by some to suggest that a joke (allegedly) on the BASSA website is the beginning and end of discussion.
Maybe the eye-drops suggestion was a 'joke' and there has been an over-reaction.
Or maybe it's reasonable to be concerned that such a suggestion should be made on a private website for people whose job includes serving food.
Either way, the attempts seem to completely overlook food tampering mentioned in this thread on this website - including by one CC poster with many years in the job (StohDznehDoPrikaza) who said eyedrops incidents were a myth but related some other rather disgusting incidents. (He/she offered the reassurance that food tampering was a very rare occurrence.)