  Using the 'drift-diffusion-Langevin' equation we show that, at least in one
geometry, finite-frequency shot noise is of the order of the 'full' shot noise
$2eI$ provided the sample is either short or long enough, $L > L_0(\omega)$.
Here $L_0(\omega) = D'/\lph \omega$ with $D'$ the effective diffusion
coefficient, $\lph$ the electron-phonon energy relaxation length with energy
transfer $eV$, and $\omega$ the observation frequency. For example, in a
typical 'zero frequency' experiment, actually performed at 10 KHz, shot noise
may be large for $L$ larger than a few centimeters. At 100 MHz shot noise may
be large for any length of the sample. The physical reason for this result -- a
competition between the equilibration length and the dynamic screening length
-- is discussed in the text.
