Scotland prop Alasdair Dickinson has criticised the performance of referee George Clancy in their Six Nations defeat to Italy.
A last-gasp penalty try saw Italy win the match 22-19, and Dickinson singled out Clancy's handling of the scrum throughout the match.
"I think he was making a mountain out of a molehill at times. When he let us scrum, we scrummed really well and got penalties. It was just frustrating that it seemed to take an age to set up," he told Sky Sports News.
"The scrum is so heavily regulated now, but it seems like front rows don't know anything about scrummaging any more - and refs do. I don't know many prop refs to be honest.
"It can be a lottery at times, but what can you do? As players we are not allowed to talk to the ref about what we can do to solve it or what issue he sees. Unfortunately, in rugby you can't talk to refs or you get sent to the bad boys' corner."
Scotland continue their Six Nations campaign against England on March 14.