[blml] on warning partner not to lead out of turn [SEC=UNOFFICIAL]

[Guthrie]

[TNLB L9A3, quoted by Richard Hills]
"When an irregularity has occurred dummy may not draw attention to it
during the play period but may do so after play of the hand is
concluded. However any player, including dummy, may attempt to prevent
another player's committing an irregularity (but for dummy subject to
Laws 42 and 43)."

[Nigel]
Clearly L9A3 empowers you to stop partner e.g.
  - bidding out of turn.
  - leading out of turn.
  - making an illegal or insufficient bid.
  - revoking (a separate law is redundant).
  - forgetting to play a penalty card.
  - misexplaining the systemic meaning of your call.

The latter finally resolves the DWS dispute :)