[bav]

Reaching into the muck is grounds for ejection. Never actually seen someone ejected for it, though. There are just things players shouldn't do--reach into the main pot, reach into the muck, monkey with someone else's cards in play. Except, of course, for dealers playing in their own room--in that case they get to do anything they please and nobody is allowed to say "boo" about it (/sarcasm) (but dealers can be some of the most ill-behaved of players and this is a minor pet-peeve of mine--I don't mind Tom Foolery in lighthearted games where nobody is taking much of anything seriously, but if you're playing NL and folks are being kinda intense over $600 pots, BEHAVE).