Main Question or Discussion Point
I just watched one of those crime shows on tv. They sprayed a chemical on a wall then turned on a black light and the chemical glowed if there was any blood on the wall. Even if the wall had been wiped clean. From now on everytime I wash my walls I'm going to drip a few drops of blood into my cleaning bucket then if in the future my place becomes a crime scene (which is possible in my neighborhood) if they spray that stuff on my walls it will look like a massacre took place there.