Its very rare that Issac Luke doesn't throw a forward pass from dummy half, and more often than not its Sam Burgess on the receiving end of those forward passes. Yet game after game they are let go by the refs.
There are 4 officials in pink out there. Two on the field and the two touchies. You would think at least one of them would be watching the ruck and resulting pass from dummy half and can see if its gone forward or not.
Regardless that its seen as a minor incident, a forward pass is still a forward pass and its an infringement on the rules that should either be called a penalty for deliberate or it should result in a scrum to the defending team at the time (or a handover if its on the last tackle).
Luke and Scam Smith are the worst offenders in the NRL for forward passes from dummy half, yet they are allowed to get away with it. But while Smith seems to often disguise his by throwing them more flat than forward which are harder for refs to pick up (they have enough trouble seeing as it is), Luke's are often so blatantly forward that they should draw a penalty.