  We use spatial spin separation by a magnetic focusing technique to probe the
polarization of quantum point contacts. The point contacts are fabricated from
p-type GaAs/AlGaAs heterostructures. A finite polarization is measured in the
low-density regime, when the conductance of a point contact is tuned to
<2e^2/h. Polarization is stronger in samples with a well defined ``0.7
structure''
