Can somebody here help me with the id of this spider? The pictures here aren't very sharp, but the color of this spider is dark (not sure if it's black or a very deep gray/brown). The sack that is next to it is about the size of a nickle. Of late, I have found many of this kind of spiders in the house. It's kind of scary not knowing if they're poisonous and how they got to be so many in the house. Is there anything I could do to control it from invading the home? Any advice given is greatly appreciated.