  The Boltzmann-Langevin equation is used to relate the shot-noise power of a
mesoscopic conductor to classical transmission probabilities at the Fermi
level. This semiclassical theory is applied to tunneling through n barriers in
series. For n -> infinity the shot noise approaches one third of the Poisson
noise, independent of the transparency of the barriers. This confirms that the
one-third suppression known to occur in diffusive conductors does not require
phase coherence.
