  We investigate the phenomenon of "faster than light" photons in a family of
dilaton black hole spacetimes. For radially directed photons, we find that
their light-cone condition is modified even though the spacetimes are
spherically symmetric. They also satisfy the "horizon theorem" and the
"polarization sum rule" of Shore. For orbital photons, the dilatonic effect on
the modification of the light-cone condition can become more dominant than the
electromagnetic and the gravitational ones as the orbit gets closer to the
event horizon in the extremal or near-extremal cases.
