  In this paper we study the formation of bound states in the continuum in a
quantum dot molecule coupled to leads. Based in the combination of bound states
in the continuum and Fano effect, we propose a new design of a spin-dependent
polarizer. By lifting the spin degeneracy of the carriers in the quantum dots
by means of a magnetic field the system can be used as a spin-polarized device.
A detailed analysis of the spin-dependent conductance and spin polarization as
a function of the applied magnetic field and gate voltages is carried out.
