  A de Broglie-Bohm like model of Dirac equation, that leads to the correct
Pauli equations for electrons and positrons in the low-speed limit, is
presented. Under this theoretical framework, that affords an interpretation of
the quantum potential, the main assumption of the de Broglie-Bohm theory--that
the local momentum of particles is given by the gradient of the phase of the
wave function--wont be accurate. Also, the number of particles wont be locally
conserved. Furthermore, the representation of physical systems through wave
functions wont be complete.
