  Recently, a global phenomenological fit to high energy data has included
charge symmetry breaking terms, leading to limits on the allowed magnitude of
such effects. We discuss two possible experiments that could search for isospin
violation in valence parton distributions. We show that, given the magnitude of
charge symmetry violation consistent with existing global data, such
experiments might expect to see effects at a level of several percent.
Alternatively, such experiments could significantly decrease the upper limits
on isospin violation in parton distributions.
