Originally Posted by bruce_brakel
The rule that a TD cannot limit the players to only using the drop zone for o.b. is not in rule book. Unfortunately, the rule book still says that the TD can limit the players' options.
The way I read the rules is that the normal options for OB are previous lie, drop zone, or last inbounds and that the TD can limit these options to a subset. The optional rethrow always gives the player the option of the previous lie which would imply that the TD can effectively only remove the option for using a DZ or the last place in bounds for OB.
But even so, the TD can put on the course routing sheet that the only relief for a certain OB under 803.09.B is a drop zone and still be in agreement with the rules. The devious TD would put the DZ in a penalty box and only those players who really know the rules would figure out that they can still throw from the previous lie.