We study a heavy impurity moving longitudinal with the direction of an
external magnetic field in an anomalous chiral medium. Such system would carry
a non-dissipative current of chiral magnetic effect associated with the
anomaly. We show, by generalizing Landau's criterion for superfluidity, that
the "anomalous component" which gives rise to the anomalous transport will {\it
not} contribute to the drag experienced by an impurity. We argue on a very
general basis that those systems with a strong magnetic field would exhibit an
interesting transport phenomenon -- the motion of the heavy impurity is
frictionless, in analogy to the case of a superfluid. We demonstrate and
confirm our general results with two complementary examples: weakly coupled
chiral fermion gases and strongly interacting chiral liquids.Comment: 6 pages, 1 figure, version accepted in PR
