There is a new rule at the live poker games at Hollywood Park Casino here in LA. If you leave the table for more than one big blind the dealer will remove the big blind amount from your stack and add it to the pot. And this will continue for each big big blind you miss. If you do not have enough chips to pay the Big Blinds you will lose your seat.
It seems they are doing this to prevent players from taking a seat at a table, then walk around while their player Cards are scanned for comps and promotions.