Introduction of an offside line five metres behind the hindmost feet of the scrum.
"What is frustrating is that you are a yard away from the man that's clearly offside looking along the line and the referee's standing the other side of you and does not put the flag up, " said Jefferies.
BBC: Hearts boss Jim Jefferies reports referee Willie Collum
When captain Steve Borthwick was caught offside running straight through a line-out, Giteau duly doubled the visitors' lead.
English referee Dave Pearson was again lenient on the Italians when Josh Sole intercepted from an offside position close to his own line.
Nacewa missed with a penalty attempt after Dragons captain Tom Willis was punished for offside, before Horgan crossed the line and Nacewa converted after 26 minutes.
That four-point gap could have been brought back to one when the Dragons were caught offside five metres from their own line, but the Ospreys opted for a scrum instead and wasted their chance.
Miller finished superbly after collecting an Aluko cross but was ruled offside and Gary Caldwell cleared off the second line.
If you say OK to goal-line technology, then it is offside technology, then penalty area technology, and we stop the football.
Logan pulled back three points for the visitors when the Scarlets were caught offside, before a fine run from Dallaglio pushed Llanelli back onto their line.
With the game won Vicente del Bosque made changes and the introduction of Cesc Fabregas almost lifted the roof off Ellis Park when, 16 seconds after being introduced, he beat the offside trap and rounded the keeper only to see his shot hacked off the line by Chavez.
Instead Riley, initially looking as if he too thought he might be offside, weaved his way downfield with a run that made ground to the halfway line.
Michael Duberry scrambled a shot off the line from the impressive Parlour and Wiltord had an effort ruled out for offside after Henry's shot had struck wood once more.
Carew scored his first goal since joining from Aston Villa last month but looked offside as he poked in with only Anton Ferdinand standing between the Norwegian striker and the goal-line.
But the score was ruled out for offside and it was Scarlets who did open the scoring after eight minutes, when Dan Evans went over the line from a Williams' pass.
Mateus sped to the try-line, but his joy was short-lived when referee Steve Walsh indicated he was playing advantage for offside.
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