Does anyone remember Jack Taylor being miced up. Known as the the Wolverhampton Butcher he eventually reffed the World Cup final between West Germany and Holland.
Why the original experiment was abandoned I do not know but the story doing the rounds was because of the bad language of the players. I think the powers that be realised that the power would have been stripped from the men in black.
I can believe the story doing the rounds, it's the main obstacle to it today I'd say, advertisers would walk away if what was said on a pitch was audible.