  Noncommutative spacetimes lead to nonlocal quantum field theories (qft's)
where spin-statistics theorems cannot be proved. For this reason, and also
backed by detailed arguments, it has been suggested that they get corrected on
such spacetimes leading to small violations of the Pauli principle. In a recent
paper \cite{Pauli}, Pauli-forbidden transitions from spacetime noncommutativity
were calculated and confronted with experiments. Here we give details of the
computation missing from this paper. The latter was based on a spacetime
$\mathcal{B}_{\chi\vec{n}}$ different from the Moyal plane. We argue that it
quantizes time in units of $\chi$. Energy is then conserved only mod
$\frac{2\pi}{\chi}$. Issues related to superselection rules raised by non-Pauli
effects are also discussed in a preliminary manner.
