If any choice in handling the matter only makes it a potential bigger problem then I would re-think the matter. I don't have the hands down end all, be all solution to this matter but from what you described I feel it would only get this individual to double their efforts to be even more...
The best approach to temps has pretty much been said. It will always be in a state of flux due to constant changeover. Give them your best and work in a way of some inclusion to the process. Each building has its own unique set of challenges and some very similar. The bottom line is treat them...