  Before studying the pentaquark system we examine the spectral weights of the
two lowest scattering states in the two-pion system in the isospin I=2 channel
on lattices of size $16^3\times 32$, $24^3 \times 32$ and $32^3 \times 64$ at
$\beta=6.0$ in the quenched theory. We find that the spectral weights scale
with the volume for large time separations. Therefore very accurate data are
necessary in order that the spectral weights determined on different volumes
yield a ratio that is precise enough to distinguish a scattering state from a
single particle state. The pentaquark system is studied on the same lattices
and scaling of the spectral weights of the low lying state is investigated. The
accuracy of the results obtained for the scaling of spectral weights do not
allow us to exclude a pentaquark resonance.
