A friend told me about Don Dickerman Minstries located in Colleyville, Texas. I have participated in the ministries here as a participant and a student. Many people believe that Christians are never in need of deliverance because they say that if the Holy Spirit is in you, devils can't be. This simply doesn't line up with scripture.
Just because a person is born again and saved does not cause demons to leave. Read in the scripture every time Jesus dealt with demons he commanded them to leave. Until they are told to leave they are just laying low. As a person walks with the Lord, they can, through their own personal walk, command demons to leave but either way, demons don't leave until they are told to go.
Don has written a book on the subject and recently re-titled the book. You can listen to a link about When Pigs Move In and find out for yourself about the topic.