The NRL have announced that any player who commits a shoulder charge with force will be suspended for at least one game, effective immediately.
The change to the rules comes after Sydney Roosters forward Kane Evans escaped sanction for his monster hit that floored Canterbury prop Sam Kasiano last week.
NRL head of football Todd Greenberg said changes needed to be made to remove any ambiguity on whether a shoulder charge should draw a charge from the match review commitee.
While the NRL had already made the shoulder charge illegal, the existing rules meant offenders could escape a charge if there was no forceful movement of the tackled person's head or neck.
Greenberg said the rule would be simplified to require any shoulder charge with force to be charged automatically.