That would be an interesting story for someone to do...you know like 20/20 did with the blue light in hotel rooms. It could detect where bodily fluids were present. I am a crime reporter and had seed the light used several times already, so I never sat or touched a lot of things until I had checked them out first. But now everybody seems to bring their own pillows and take the comfortor's off the bed. I wonder if you find similar nasties on cruise ships. I hope not. I would think that MAYBE the class of people would be a little bit better...but people always surprise me.