Several (mostly old) questions, such as this one, have poor, unreferenced answers marked as accepted. Leaving these poor answers is negative to the quality and image of this site. They are broken windows: having the little "checkmark" next to a front and center poor answer seems like an endorsement of a poor answer.
Do we have a system in place to handle such an occurrence?
Are they different than, say, a question with a few good answers (one accepted) and a poor answer at the bottom marked -5? Is the proper action just to downvote or to flag if it's an old question that hasn't been updated in months? What about a new or active question?