AngryLeprachaun, I do not claim to be a meditation expect, heck, all i know is pretty much what i have read from this site, but I do not believe that would be true, or else someone would have mentioned it here or in another topic. If an evil spirit was to inhabit ones body while they are meditating then many of the people here would probably tell you NOT to meditate while it is quite the opposite. But i guess there is a possibility that i may be wrong. I have seen things on TV and such where, while people were meditating, supposedly spirits of the dead came and the meditating person would begin drawing or writing, supposedly with handwritting, writting style, or art style of the spirit that was pocessing their body or whatever. Not entirly sure that i believe it, but i'm not entirly sure what to believe these days.
Overall. I'd say no. If someone who has more experience can say otherwise then i'd listen to them.