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The processes $D^0\to K^0 K^-\pi^+$ and $D^0\to\ok K^+\pi^-$ involveintermediate vector resonances whose amplitudes and phases are related to eachother via flavor-SU(3) symmetry. Dalitz plots for these two processes can shedlight on the usefulness of this symmetry in studying charm decays. Until thisyear the only available data on this process came from a conference report in2002 by the BaBar Collaboration, but now an independent data sample of higherstatistics has become available from the CLEO Collaboration. The goal is topredict Dalitz plot amplitudes and phases assuming flavor-SU(3) symmetry andcompare them with experiment.  An SU(3) fit can account for the relative magnitudes of the amplitudes forthe decays $D^0 \to K^{*-}K^+$ and $D^0 \to K^{*+}K^-$, but neither the currentBaBar sample (based on an integrated luminosity of 22 fb$^{-1}$) nor the CLEOanalysis has significant evidence for the decays $D^0\to K^{*0}\ok$ and $D^0\to \oks K^0$. At this level one is unable to compare magnitudes and phaseswith theoretical predictions. The purpose of this Letter is to advocate ananalysis using the full BaBar sample (more than 20 times the 2002 value). Itshould definitively determine whether predicted magnitudes and phases agreewith experiment. A similar analysis should be possible with an even largersample of events collected by the Belle Collaboration at KEK-B.

Flavor-SU(3) tests from $D^0 \to K^0 K^- \pi^+$ and $D^0 \to \bar K^0 K^+ \pi^-$ Dalitz plots