A practice appears to have been built up, at least from anecdotal evidence, of mediators destroying their notes following mediation. It is submitted that this practice could eventually be the downfall of those particular mediators.
"Mediators’ notes of the mediation - a mediator's protective device,"
ADR Bulletin: Vol. 1
, Article 2.
Available at: https://epublications.bond.edu.au/adr/vol1/iss8/2