Hi Sherer, For the first time ever, you have brought up the point, that l have been saying all along, One hour before the game, the referee is given the team sheet from both sides, it is down to him or her to check, everything that goes on that pitch is down to the ref. Therefore, if you have a dodgy player (and yes you get them) it is down to the referee in the end, this is why, there are not very many around, as referee's quit each month due to the aggro they get, especially Sunday's.
Referee's have the hardest job possible - they can't win on anything.