 The answer, of course, depends on what one takes relativity theory to require. It can be shown (Eberhard 1978, Ghirardi, Rimini &amp; Weber 1980, Page 1982) that, in the absence of nonlocal interaction terms in the Hamiltonian, quantum correlations cannot be exploited to send signals superluminally. There has been a tendency in some of the literature to take this by itself to indicate compatibility with relativity. That this is insufficient can be seen from the fact that there can be theories, such as the de Broglie-Bohm theory, that require nonrelativistic spacetime structure for the formulation of their dynamical laws, while not permitting signalling (at least, as long as the usual distribution postulate for particle positions is satisfied). 