I’m sure it is going to be used for good and BAD! wouldn’t be great if google already search result for stuff that haven’t emerged from your subconscious yet? Or arrest “Criminal” because they where thinking “Bad” stuff? http://www.vice.com/en_ca/read/could-mapping-the-human-brain-lead-to-anything-good
Originally it was thought it could give you brain cancer, now it might protect your from Alzheimer’s. this is according to a study published by Gary Arendash, a research professor with the Florida Alzheimer’s Disease Research Center. Check this article : Could Your Cell Phone Help Shield You From Alzheimer’s?