  We consider the transport properties of a model of fermions scattered by a
critical bosonic mode. The mode is overdamped and scattering is mainly in the
forward direction. Such a mode appears at the quantum critical point for a
electronic nematic phase transition, and in gauge theories for a U(1) spin
liquid. It leads to a short fermion life-time, violating Landau's criterion for
a Fermi liquid. In spite of this, transport can be described by a Boltzmann
equation. We include momentum relaxation by umklapp scattering, supplemented by
weak impurity scattering. We find that above a very low temperature which
scales with $\Delta_q^3$, where $\Delta_q$ is the minimum umklapp scattering
vector, the resistivity is linear in $T$ with a coefficient which is
independent of the amount of disorder. We compare the relaxation time
approximation with an exact numerical solution of the Boltzmann equation.
Surprisingly we find that unlike the resistivity, the Hall Coefficient strongly
deviates from the relaxation time approximation and shows a strong reduction
with increasing temperature. We comment on possible comparisons with
experiments on high $T_c$ Cuprates.
