If you really want to be 100% sure the show is scripted then take a look at the "crew". Chasing Mummies has "story editors".
Then take a look at every other reality show on IMDB, Ghost Hunters, Survivor etc.
Notice what they don't have listed with the crew?
The only reality about Chasing Mummies is it sucks.
Taken from wiki
http://en.wikipedia.org/wiki/Story_editor
Story editor
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Story editor is a job title in motion picture and television production. A story editor is a member of the screenwriting staff who edits stories for screenplays.
The story editor has many responsibilities, including finding new script/breakdown writers, developing stories with writers, and ensuring that scripts are suitable for production. The story editor will work closely with the writer on each draft of their story and script, giving the writer feedback on the quality of their work, suggesting improvements that can be made while also ensuring that practical issues, like continuity and correct running time, are adhered to. When a script is past due, multiple people may write an act—called "gang banging" a script. Many primetime series have an executive story editor and a story editor.
Marc Abrams of the TV series The Bernie Mac Show said, "As you go from show to show you learn that each has its own temperature and its own etiquette. You recognize your role on that particular show. Certain show runners encourage the lower-level writers to pitch ideas, others don't. Some want ideas well thought out before they are presented, others like to hear the kernel of an idea that could be expanded."
This role may overlap with that of the head writer.
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I hear that!
At least they fake it on the fly though. I stopped watching GH after the Halloween episode "jacket tug" incident.
I'm pretty sure people know what to expect when watching a show about psychics and ghosts. After all, they're using theorized ghost hunting equipment to hunt for theorized ghosts. It's good for a laugh at best.
Chasing Mummies however could have been so much more.