Quantum Mechanics and Leggett's Inequalities

We show that when the proper description of the behaviour of individual photons or spin 1/2 particles in a spherically symmetric entangled pair is done through the use of the density matrix, the Leggett's inequality is not violated by quantum mechanics.Comment: 7 pages, no figures. A missing global sign in the r.h.s. of eq. (4.10) in section 4 of version 1 (v1) invalidates the conclusion of that particular section, which is then suppressed in the present version (v2