The strange thing is that anyone might think that there might be. This is posted on a side door of the Loker Hydrocarbon Institute (not somewhere that I go into often - but the chairs' meeting is held round a very big table there), and I suppose the building may contain other labs and such like. But one might think that every university department should carry one of these warning notices. Or are there some parts of the institution where they hire day laborers to wash out test-tubes or feed the experimental rats or sweep the floors? Clearly it's meant to be noticed and act as a very firm deterrent.