In this paper, we present three examples of the development of legal concepts and rules analyze them in therms of AI learning methods, in particular, the candidate elimination algorithm. The three areas of legal doctrine are: (1) the doctrine of the liability of manufacturers to third party buyers; (2) the Fourth Amendment doctrine relating to stop-and-frisk searches; and (3) the doctrine of attractive nuisance. For each of the legal areas, we give a synopsis of the legal developments and show how it can be viewed from an Ai point of view.