You were arrested because someone simply picked your photo out of a photo array but the case was later dropped before going to trial Can you sue the person that accused you?

Yes, you can sue the person who accused you if you were arrested because someone chose your photo from a photo array. If the case was dropped and you did not experience undue stress, the judge may simply throw the civil case out of court. If the experience effected your life adversely, you might be able to obtain reparation for damages in a civil court.