Abstract
The small-angle correlation function of two indistinguishable particles produced in hadronic processes is shown in general to be unrestricted by Bose-Einstein or Fermi-Dirac statistics. The analogy of hadron interferometry to Hanbury-Brown and Twiss intensity interferometry can break down because of dynamical correlations between observed and unobserved fragments. Two physical examples in the context of relativistic nuclear collisions illustrate this point.