Plan A seems to have worked. I have not seen ants in my bathroom since I laid down the bait powder. However, they have decided to move on to other parts of the house. On Saturday, they were seen coming out of an electrical outlet in my roommate's bedroom. When we took the cover plate off, we found they had made a next inside the outlet box. They were also coming out from behind the tile in the kitchen and marching up the sidewalk outside of the house like a massive army.
Any suggestions on how to completely eliminate these pests would be greatly appreciated. Thanks!!