They do. Usually they're used for legal reasons, or because a client wants a last chance to say goodbye to a loved one. It's a great way to solve a contested will or something of that nature. They retain their memories, so as long as you ask them very specific questions, they can usually answer. Sometimes they can testify in court, but that's tricky.

Murder victims and magic users are no-go, though. They need to stay in the ground.