When, after an event, measures are taken, which if taken previously, would have
made the event less likely to occur, evidence of the subsequent measures is not
admissible to prove negligence or culpable conduct in connection with the event.
This rule does not require the exclusion of evidence of subsequent measures when
offered for another purpose, such as proving ownership, control, or feasibility of
precautionary measures, if controverted, or impeachment.