MD's shouldn't feel like they need to read this to their players, but it's a good idea to weave some of it into your intro speech, especially if your group has never participated in a MMDT before.
If murder is not allowed, don't try to kill anyone.
Don't destroy any clues.
Don't move Static clues.
If there's a Clue Deposit, don't hide Dynamic clues from other players.
Be respectful of the facility.
Stay in character whenever possible.
Don't make people feel bad for being more or less in character than other players.
Respect the MD's decisions, even when they're incongruent with the way the scenario would play out in real life.
Let the MD/Host know in advance of any allergies/food aversions so the meal can run smoothly during the event.