If you aren’t familiar with the phenomenon of ghost hunting, you haven’t surfed through your basic cable channel lineup in a few years. Yes, they promote the paranormal each week with shows like Ghost Hunters, Ghost Adventures, and The Haunted.
Consulting the dead opens door to powerful demonic activity.
Ghost hunters often use technological tools to help them with their investigations, but some of these methods seem to me to be little more than high tech séances and Ouija boards. EVP (electronic voice phenomena) recorders, ghost/spirit boxes (modified radios that allegedly can be manipulated by spirits), and electronic speech synthesis devices like the Ovilus should be avoided by Christians. EMF (electromagnetic field) meters probably aren't an issue, provided they aren’t used to gain information from spirits.
The story of Saul and the Witch of Endor is the most popular, Biblical argument against ghost hunting. In 1 Samuel 28, the “witch” summons the spirit of Samuel. The result was tragic.
I saw Satan fall from heaven like lightning. Look, I have given you authority to crush snakes and scorpions underfoot. I have given you authority over all the power of the enemy. Nothing will harm you. Nevertheless, don’t rejoice because the spirits submit to you. Rejoice instead that your names are written in heaven (Luke 10:18-20).
The spiritual war between good and evil is real, but getting actively involved with it just for the thrill factor or the entertainment value is never a good idea.