"You've lost" yeah try to tell the court that the person who was miles away from the victims murdered them using a special power to enter their dreams and kill them, but he can only do it if he touched them at least once... I'd really, really like to see that try to be brought up.
Edit: It'd probably play out like this "Plaintiff please bring forth your case." "Yes your honor, we believe this person did it." "And why do you believe this? Did he confess or do you have evidence?" "Well your honor, he appeared in this persons dream and told them they were actually in their dream and that I was in danger" "...You do know that's not how it works right?"