  We compute the contribution to the conductivity from holographic Fermi
surfaces obtained from probe fermions in an AdS charged black hole. This
requires calculating a certain part of the one-loop correction to a vector
propagator on the charged black hole geometry. We find that the current
dissipation is as efficient as possible and the transport lifetime coincides
with the single-particle lifetime. In particular, in the case where the
spectral density is that of a marginal Fermi liquid, the resistivity is linear
in temperature.
