It has always struck me as strange that rule... I mean, I didn't get special training on how to clean blood when I was a nurse, I was given a mop or a cloth and told to wipe it up. The fear with have over blood is a strange one given how quickly it becomes pretty much harmless, and that people wear gloves anyway. In which case, who's job is it to clean it? Oh right - me. I can just see it, being called on 999 to mop up a spill of blood.