I wonder if something like this could be done just based on ID statistics already in the data? Analyze how often CV identifications end up not being the community ID for each taxon in CV, pick a threshold along the resulting “bell curve” (or whatever shape it manifests), and “flag” in some way(s) those taxa with especially unreliable CV results. Maybe a little “caution” flag when displayed among CV suggestions. And maybe a filter parameter to support/inform the manual flagging option that @tonyrebelo has in mind? Just thinking out loud here…