  We study the spin relaxation of charge carriers in graphene in the presence
of spin-polarized charged impurities by calculating the time evolution of
initially polarized state. The spin relaxation time shows completely different
energy behaviour for short-ranged and long-ranged spin scatterers and can be
used to identify the dominant source of spin scattering. Our results agree well
with recent experimental findings and indicate that their spin relaxation is
likely caused by long-ranged scatterers.
