What does cockroach excrement look like How do you know if you have cockroaches?

At about 1:50 in the video they talk about cockroach stool

http://www.videojug.com/film/how-to-deal-with-cockroaches At about 1:50 in the video they talk about cockroach stool

http://www.videojug.com/film/how-to-deal-with-cockroaches