. . . [I]t is useful to know how to keep them from you in the first place. A home dedicated to the Lord, and free of influences which invite demons in, is protected from such spirits. Sadly, there are many influences which give demons a foothold in our house. They include but are not limited to the following:
Pornography, Drugs, Alcohol, A heart filled with anger, Active hatred of any person or group, etc.

You get the idea. What some do not realize is that anyone in the home can destroy the barrier of a dedicated home, even if that person is only a guest. We do not need to take the cleansing of our homes to the level they did under the law of Moses, but I would say after an event like this, we should rededicate our homes and redouble our efforts to discover how the demon got in, and make the corrections in our lives required to keep our homes as sacred as a temple.