[Ouija board evil?]

So its 3:27 am and my friends just left to go by this products. Its a board where you hold a piece of lookign glass over a board of letters and ask a question. The glass is suppose to move toward the answer to your question. I know many people think this product is evil and channels the devil who impersonates your loved ones when you ask a question about the deceased (atleast that is what i was told in my christian academy when i was younger). So i protested to the use of it as well as a few other christians in the room but in the end they went. I told them not to bring it back to the apartment so there going to an abandoned apartment upstairs and i was wodnering if i should be concerned. I know this may be stupid but it just makes me nervous. I dont like the thought of them being tempted by the devil.