I posted earlier about my son allowing friends to use our house for a party. Until now, I haven't seen anything out of the ordinary and it looked like the house was as we left it. I just went in the master bathroom (just a toilet, brown walls, white door and a fan). On all four walls there is a dry, sticky substance that looks like it was dripping down the walls. In some places it looks like a white powdery drip. It's all over. I don't usually turn the light on when I go in there but today I did and that's when I saw it. I know for sure it wasn't there before we left on our trip. Question - does anyone know of anything that could have been done in there that would have caused such a thing? Any kind of drug or strange party ritual? I'm going to have the police come take a look. Now is just not a good time to call them with the whole family here.