Hardy-type experiment for the maximally entangled state: Illustrating   the problem of subensemble postselection
  By selecting a certain subensemble of joint detection events in a two-particle interferometer arrangement, a formal nonlocality contradiction of the Hardy type is derived for an ensemble of particle pairs configured in the maximally entangled state. It is argued, however, that the class of experiments exhibiting this kind of contradiction does not rule out the assumption of local realism. 
Jose L. Cereceda