I am NOT an attorney, but I would suspect you'd want to have them sign a release and or understanding of how the information would be used. Almost like a Privacy Policy statement. Any attorney that deals in contracts (especially consumer contracts) would probably be the place to start. Many attorneys will listen to your needs and if they do not practice the type of law you need, make a referral for no charge. I would start with friends/family and get names of attorney's that are already in you "sphere."