Ghost Hunting

My sons and there friends like to do alot of ghost hunting. I have trouble with that because I don't feel that is very wise. I feel there's alot of evil spirits out there and I believe as Christians we should not be apart of searching out spirits. I know that the show Ghost Hunters has given them more of a desire to do this and I wish they would find better things to do with there time. I pray for them often and hope they will soon get bored with this whole thing.