Here's how you can find out if your home is infested with the nasty cockroaches - 1. Shell casings of hatched eggs of roaches are usually spotted. 2. Cockroach feces resembling ground coffee or black pepper will be visible. 3. A serious infestation may cause a pungent, musty odour. 4. Dead cockroaches may be visible from time to time. 5. Roaches can be heard scurrying about at night. 6. Spotting a roach in the daytime is a sign of severe infestation. 7. Prolonged stomach related problems; especially in children may be due to a roach infested kitchen.