  A recent proposal seeks to explain the anomaly in the HERA high-Q^2 neutral
current e^+p data by modifying the parton distribution functions at
moderate-to-high-x and large Q^2. We investigate the consequences of this
proposal for the HERA high-Q^2 data itself, in the neutral current e^-p channel
and especially in the charged current e^\pm p channels. We find that there are
striking signatures in the charged current which already serve to rule out many
possibilities, including the (symmetric) intrinsic charm hypothesis. For those
not ruled out, interesting signals are predicted in e^-p scattering.
