  The absorption cross section for scattering of fermions off an extreme BTZ
black hole is calculated. It is shown that, as in the case of scalar particles,
an extreme BTZ black hole exhibits a vanishing absorption cross section, which
is consistent with the vanishing entropy of such object. Additionally, we give
a general argument to prove that the particle flux near the horizon is zero.
Finally we show that the {\it reciprocal space} introduced previously in
\cite{gm} gives rise to the same result and, therefore, it could be considered
as the space where the scattering process takes place in an AdS spacetime.
