  We investigate parity-violating asymmetries in polarized n p radiative
capture, and deuteron electro-disintegration in quasi-elastic kinematics, using
the DDH model for the parity-violating nucleon-nucleon interaction. We find
dramatic cancellations between the asymmetries induced by the parity-violating
interaction and those arising from the associated parity-violating
pion-exchange currents. In np capture, the model-dependence of the result is
nevertheless quite small because of constraints arising through the Siegert
evaluation of the relevant E1 matrix element. In quasi-elastic electron
scattering these processes are found to be insignificant comared to the
asymmetry produced by the gamma-Z interference on individual nucleons. These
two experiments, then, provide clean probes of different aspects of
weak-interaction physics associated with parity violation in the np system.
